While previous research has focused primarily on improving measurement precision, its potential for high-resolution imaging had not been fully validated.

Now, a research team led by Dr. Hyang-Tag Lim at the Center for Quantum Technology of the Korea Institute of Science and Technology has achieved a world-first breakthrough. By applying a special quantum entangled state known as the multi-mode N00N state to distributed sensors, the team demonstrated a quantum sensing network capable of enhancing both precision and resolution simultaneously.

Earlier distributed quantum sensor studies often relied on single-photon entanglement, which improved precision but struggled to distinguish interference patterns critical for high-resolution measurement. In contrast, the multi-mode N00N state entangles multiple photons across specific paths, producing much finer interference fringes. This enables not only sharper resolution but also heightened sensitivity to minute physical changes.

The new technique brings measurement performance close to the Heisenberg Limit, the ultimate bound of quantum precision, while opening the door to ultra-high-resolution imaging applications. With the U.S. and Europe investing heavily in quantum sensors as next-generation strategic technologies, the breakthrough signals Korea’s potential to secure international competitiveness in this critical field.

In experiments, the KIST team generated a two-photon, four-path multi-mode N00N state and used it to simultaneously measure two distinct phase values. The results showed an 88% improvement in precision (2.74 dB gain) compared to conventional approaches, experimentally verifying performance near the Heisenberg Limit for the first time.

The achievement holds broad implications for a wide range of fields that demand extreme precision. In the life sciences, it enables the imaging of sub-cellular structures that are invisible to conventional microscopes. In the semiconductor industry, the technology allows for the detection of circuit defects at the nanometer scale. In astronomy, the breakthrough makes it possible to reveal detailed structures of distant celestial bodies that previously appeared blurred in traditional telescope images.

“This result marks an important turning point in proving the feasibility of practical quantum sensor networks based on quantum entanglement,” said Dr. Lim. “If combined with silicon photonics-based quantum chip technologies, this approach could one day extend to applications in everyday life.”

The research was supported by the Ministry of Science and ICT, KIST’s projects, and the IITP’s Quantum Sensor Commercialization R&D Program. The findings were published on July 1 in the international journal Physical Review Letters under the title “Distributed Quantum Sensing with Multi-Mode N00N States.”

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Under the agreement, the two companies will collaborate on the development of battlefield simulation models that merge quantum and AI algorithms, research the standardization of 3D spatial data for quantum computing applications, and build integrated platforms combining their core technologies. The partnership aims to maximize technological synergy and accelerate the deployment of advanced solutions in the defense sector.

Orientom, leveraging its expertise in quantum algorithms, quantum financial services, and platform technologies, will spearhead the quantum computing component of the project. Deep In Sight, on the other hand, will enhance its AI and 3D spatial data analysis capabilities to provide optimized solutions for addressing practical challenges in defense and enhancing real-world applications.

The companies emphasized that the collaboration is not limited to defense. The technologies are expected to serve as a foundation for advanced AI model development across industries that demand high-level analysis and complex decision-making, including finance, smart cities, and beyond.

Deep In Sight brings proprietary technology in lightweight AI-powered 3D camera solutions capable of precisely extracting complex environmental data such as spatial recognition, object detection, and biometric identification. These capabilities are particularly suited for real-time battlefield awareness and predictive simulation systems critical to defense and security operations.

Lucas Oh, CEO of Deep In Sight said, “This agreement marks a significant starting point in accelerating technological independence and advancement in strategic national sectors through the convergence of AI and quantum technologies. We aim to lead the high-precision defense solutions market with differentiated lightweight AI and 3D spatial information technologies.”

Alfred Bang, CEO of Orientom, added: “Through this partnership, we will deliver effective research outcomes and commercialization cases. Our goal is to ensure that quantum-based AI technologies create meaningful breakthroughs across a wide range of industries.”

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On the 28th, the two institutions signed a memorandum of understanding at the Quantum Convergence Research Center at Yonsei University’s International Campus. The agreement, the “Super-Gap Startup 1000+ Project,” led by the Ministry of SMEs and Startups and the Korea Institute of Startup & Entrepreneurship Development, marks a milestone in Korea’s startup landscape by uniting a university and a government research institute in the advanced field of quantum computing.

The partnership, led by Yonsei University’s Quantum Business Group and the Korea Institute of Science and Technology (KIST)’s Technology Commercialization Department, aims to accelerate the growth of startups in the field of quantum innovation. Key areas of collaboration include shared use of quantum computing infrastructure for technology validation, joint discovery and support of early-stage companies, and programs for talent exchange and education. The two institutions plan to establish a practical model for collaboration between academia, research, and industry.

A key feature of the agreement is that startups will gain direct access to quantum computing systems for real-world testing. At the center of the initiative is Korea’s first on-premises IBM 127-qubit quantum computer, recently installed at Yonsei University. Providing private startups with access to such high-performance infrastructure marks an unprecedented move in Korea’s tech ecosystem, highlighting the project’s pioneering significance.

The system will be applied to industrial projects by KIST-affiliated companies, selected “Super-Gap Startups” in the quantum field, and Post-TIPS firms located in the Hongneung Special R&D Zone.

To prepare startups for practical use, the two organizations will also provide joint consulting and strategic guidance, ensuring systematic support from technology validation to commercialization. This framework is intended to transform research outputs into market-ready products and services, representing a shift from simple technology transfer to strategic business partnership.

Jae Ho Cheong, Director of Yonsei’s Quantum Business Division, said, “Through the IBM 127-qubit quantum computer, we are making tangible collaboration among universities, research institutes, and startups a reality. We hope this agreement becomes a central driving force in expanding Korea’s quantum technology ecosystem.”

Sunjoon Kang, head of KIST’s Technology Commercialization Department, added, “Providing deep-tech startups with direct access to a quantum computer is in itself a groundbreaking model. We will fully support this effort so that it can be remembered as a case where barriers between universities and research institutes were truly broken down.”

The agreement encompasses not only technology development but also verification, education, and resource sharing necessary for commercialization. As a result, the partnership is expected to serve as a hub enabling quantum technology startups to enter the market and scale more rapidly. Observers now watch closely to see whether this initiative will help establish a more sustainable and multidimensional foundation for Korea’s quantum computing industry.

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On the 30th, the Electronics and Telecommunications Research Institute (ETRI) announced that, in collaboration with KAIST, it had developed the world’s first new technology enabling stable quantum communications in moving environments such as satellites, ships, and drones.

Quantum communications, which transmit information via the quantum states of light, are highly precise but notoriously unstable in wireless or mobile settings where weather and environmental factors cause rapid fluctuations. Particularly in sky, sea, or aerial environments, maintaining reliable transmission of quantum states has been a critical challenge.

This study overcomes those barriers, demonstrating for the first time that quantum information can be reliably exchanged in motion. The advance opens pathways for applying quantum technologies to satellite-to-ground secure links, drone communications, and maritime networks.

Quantum key distribution (QKD) is a technology that distributes encryption keys that are fundamentally impossible to eavesdrop on using quantum mechanics principles. Existing QKD required constant recalibration of the receiver’s measurement devices whenever the channel environment shifted. The KAIST–ETRI team proved instead that with simple local operations, secure key distribution is possible regardless of channel conditions. The theory was established by Prof. Joonwoo Bae’s group at KAIST, while experimental verification was carried out by ETRI researchers

Researchers employed a 100 MHz vertical-cavity surface-emitting laser (VCSEL) to generate single-photon pulses. The VCSEL, a type of semiconductor laser, emits light vertically from the top surface of a chip.

Crucially, the MP-based QKD system demonstrated tolerance of a quantum bit error rate (QBER) up to 20.7%, meaning that as long as the error rate of received quantum bits remains below this threshold, secure key distribution is possible without calibration. This establishes a foundation for reliable QKD in noisy, real-world conditions.

The researchers believe that these achievements could be applied to environments similar to satellite-to-ground links. The results, co-authored by ETRI researcher Haesin Ko and KAIST’s Dr. Spiros Kechrimparis, were published on June 25th in the IEEE Journal on Selected Areas in Communications.

In parallel, ETRI also addressed another long-standing bottleneck: polarization-dependent loss in integrated-chip QKD systems. By introducing a simple optical correction method, the team demonstrated stable key distribution without performance degradation—work that appeared in March as the cover article of Advanced Quantum Technologies. This is expected to accelerate the commercialization of compact, lightweight QKD devices, which could replace today’s bulky and costly bulk-optics systems.

ETRI emphasized that integrated chip-based research is essential for the widespread adoption of QKD technology, adding that numerous technical challenges beyond polarization-dependent loss must still be overcome. The institute noted that follow-up research is currently underway to address these issues.

Kyungchun Im, the head of the Quantum Communication Laboratory at ETRI, said, “Research on integrated chips is essential for the widespread adoption of QKD. In addition to polarization-dependent loss, numerous technical challenges must be addressed to implement QKD systems using integrated chips, and further research is necessary.”

Chunju Yoon, head of Quantum Technology Research at ETRI, said, “Independence from channel fluctuations greatly enhances the flexibility of quantum cryptography. We aim to expand this technology to long-distance free-space links and lay the groundwork for a global quantum network.”

Professor Joonwoo Bae of KAIST added, “This achievement is a decisive turning point that brings trustworthy quantum-secure communications into practical reality, even in complex environments.”

Over the past decade, ETRI has built a track record in quantum technology, including chip-based and miniaturized QKD modules, real-world 100-meter wireless QKD demonstrations, quantum computing compiler technology, transmission standardization with Korea’s top telecom operators, room-temperature quantum internet technologies, and the world’s first quantum-safety verification systems. Today, the institute is emerging as a global leader across quantum communications, quantum computing, and quantum sensing, focusing on both innovation and commercialization.

This project was supported by Korea’s Ministry of Science and ICT, the Institute of Information & Communications Technology Planning & Evaluation (IITP), the National Research Foundation of Korea, and the newly established Korea Aerospace Administration, under multiple national programs including “Core Quantum Internet Technologies,” “Quantum Cryptography Expansion and Next-Generation Development,” and “Integrated QKD and Transmission Technologies.”

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The new center will develop and operate quantum services and research platforms accessible to both academia and industry. This center aims to lay the groundwork for the practical adoption of quantum computing in Korea, directly linking researchers and enterprises with the advanced computing resources they require.

Under the partnership, IonQ will provide a next-generation quantum system with up to 100 qubits, which will be integrated into a private cloud–based hybrid quantum–classical computing environment. This will enable researchers to remotely access high-performance quantum resources, conduct experimental approaches to complex problems, and explore industrial applications.

Beyond technical support, IonQ will also deliver technology transfer and consulting services to enhance operational efficiency and system stability. The project is positioned not as a one-off deployment, but as a strategic long-term investment in Korea’s quantum ecosystem, aiming to secure national capabilities in the field.

Niccolo de Masi, CEO of IonQ, said, “This infrastructure project led by KISTI represents a pivotal investment in elevating Korea’s research and innovation ecosystem. We are committed to establishing practical use cases of quantum technology in Korea through this project.”

KISTI President Sik Lee stated, “Through our partnership with IonQ, we will accumulate expertise in the operation, service, and utilization of quantum platforms, while fostering the spread of research across industries. This project will not be limited to short-term outcomes but will contribute to the long-term establishment of the quantum computing industry in Korea.”

The collaboration builds on an MoU signed on April 16, under which IonQ and KISTI pledged close cooperation to help Korea secure leadership in the global quantum economy. IonQ is already working with leading Korean corporations such as Hyundai Motor, SK Telecom, and Intellian Technologies, as well as top academic institutions including Seoul National University and Sungkyunkwan University, further advancing the country’s quantum technology ecosystem.

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Themed “100 Years of Quantum: Awakening Industry”, the event commemorates the centennial of quantum mechanics. It features a rich program including an international academic conference, industry and research exhibitions, global cooperation events, and public lectures, fostering a multi-layered network spanning industry, academia, and government.

At the opening ceremony, over 300 representatives attended, including Minister of Science and ICT Sang-Im Yoo, and representatives from the European Union, the United States, Switzerland, the Netherlands, and Finland, as well as academic and industrial leaders. The event began with welcome remarks from Organizing Chair Taehyun Kim and Minister Yoo, followed by awards ceremonies recognizing distinguished contributors to the quantum field. The day concluded with the Quantum Frontier Forum, where representatives from 12 countries introduced their respective national quantum strategies.

World-renowned quantum experts’ visits also drew attention. Professor Oskar Painter of Caltech, who heads Quantum Hardware at Amazon Web Services (AWS), delivered a keynote on “Error Correction, Scaling, and Overcoming the Numerical Limits of Quantum Computing.” Celia Merzbacher, Executive Director of the Quantum Economic Development Consortium (QED-C), presented on “From Research to Reality: The Emerging Quantum Economy.” Meanwhile, Professor Eun-Ah Kim of Cornell University is slated to speak on the intersection of quantum technologies and artificial intelligence, focusing on complexity theory.

The international conference will be held in the Future Room during the event. Under the common theme of “Quantum Technology: Crisis and Opportunity,” a total of eight sessions were planned, including quantum computing, quantum communication, quantum sensing, and quantum science, with 24 leading scholars from domestic and international institutions presenting. Separately, the industry conference will be held on the 25th, followed by discussions on industrial trends and cooperation initiatives in each country with three keywords: “Industry,” “Nation,” and “Region.” Thirteen industry associations and experts from the United States, the European Union, Japan, and South Korea will participate as presenters.

The exhibition includes prominent participants such as the Korea Research Institute of Standards and Science, Electronics and Telecommunications Research Institute (ETRI), Seoul National University, and POSTECH, alongside leading telecom companies KT, SK Telecom, and LG Uplus. Notable mid-sized firms like MegazoneCloud and SDT also joined. Overseas participants include IBM, IonQ, QuEra, Quandela, and Zurich Instruments. The central stage inside the exhibition hall features continuous technical demonstrations. The Quantum Business Networking Night, held in conjunction with the exhibition, is drawing attention as a key venue for forging partnerships and technological collaboration.

International cooperation is also a core focus. The Ministry of Science and ICT hosted bilateral roundtable meetings with the EU, QED-C (USA), and Finland, while Korea, Denmark, Switzerland, and the Netherlands held a joint presentation session. A collaborative workshop with the OECD is also taking place, aimed at strengthening policy alignment in the global quantum arena.

Programs for the public are a significant component as well. On September 25, Kyung Hee University Professor Sang Wook Kim, and science communicator Orbit will present a special lecture titled “Quantum Class That Stands Out.” On the 26th, a live talk show under the theme “Time to Change the World” will be held, featuring Sungkyunkwan University’s Yonuk Chong, KAIST’s Kab-Jin Kim, ETRI’s Eun-ok Bae, IDQ Korea’s Sangyun Uhm, and Yonsei University’s Kyungdeock Park, who will discuss the societal implications and potential applications of quantum technologies.

Minister Yoo emphasized, “Korea envisions a bold leap forward in quantum technology. Quantum Korea is not only the launchpad for that vision but also a trusted platform for global cooperation.”

The event began accepting pre-registration on June 19, and on-site registration is available throughout the event. Further details on the program and participating companies can be found on the official Quantum Korea 2025 website.

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KAIST announced on the 28^th that a research team led by Professor Jihyeon Yeom of the Department of Materials Science and Engineering has successfully developed the first wideband circular polarization (CPL) detection semiconductor material that can detect ultraviolet to short-wavelength infrared rays using atomic-level chiral control of selenium.

This innovative technology is a film-type material that can detect circular polarization (CPL) at room temperature with high sensitivity. It is attracting attention as a key material for quantum computing, spintronics, and photosensor technology, such as decoding light-encrypted information or controlling quantum bits.

Chirality refers to left-right asymmetry and is a very important physical property not only at the molecular level but also throughout optics, medicine, and life phenomena. It is a technology to distinguish circular polarization (CPL), which is important for detecting the spin characteristics of light.

Mindful of the fact that CPL sensors are vulnerable to moisture or ultraviolet rays and are prone to deterioration, Professor Jihyeon Yeom ’s team turned their attention to selenium (Se)—an inorganic material known for its inherent chiral crystal structure and long-term stability.

Selenium has a unique chiral structure and can increase performance stability semi-permanently. However, the atomic structure naturally exists in both right and left directions, making it challenging to control in one direction and limiting its practical use. The research team developed a ‘chiral transfer technology’ that can control the lattice structure to have asymmetry (chirality) in the left or right direction by making selenium (Se) into a ‘selenium nanorod’ in the form of a nano-sized rod.

The researchers confirmed that the manufactured selenium nanofilm device can detect CPL in a wide wavelength range from ultraviolet rays (180 nm) to short-wavelength infrared rays (2500 nm), and recorded excellent performance in precisely distinguishing polarization directions without additional polarization filters, with a light response asymmetry index of up to 0.4 (0 being unable to distinguish left and right light at all, ±0.1 being fine distinguishable, and ±0.4 being recognized as a high-performance sensor because it can distinguish abnormal left/right circular polarization very clearly).

Importantly, the Se nanofilm maintained its performance without any degradation for over 13 months in ambient conditions, showcasing its long-term operational stability—a key advantage of using an inorganic material platform.

In the past, lattice chirality could be analyzed through expensive transmission electron microscope (TEM) equipment, while the newly developed 2D Raman photoactivity (2D ROA) mapping technique is a new and powerful analysis technology that can visualize and quantitatively analyze how the chiral structure (left/right asymmetry) of selenium nanofilm is distributed throughout the film.

Professor Jihyeon Yeom of the Department of Materials Science and Engineering at KAIST stated, “This study presents a new methodology for implementing and analyzing chiral properties in the field of semiconductor optical materials. As it can selectively read and distinguish circular polarization information of light, it can be applied to light-based quantum information processing or developing low-power semiconductor technology. The selenium nanofilm synthesis process used in this study takes place at room temperature, and it is an eco-friendly process that does not require harmful chemicals or high-temperature heat treatment and can be safely tested at room temperature.”

She also emphasized that “We will be able to expand to base technologies that can be applied to various fields such as quantum optics, security optics, bio-diagnosis, and image sensors.”

The research was conducted in collaboration with Professor Kyung Min Kim’s team at the Department of Materials Science and Engineering of KAIST and led by Dr. Junyoung Kwon, currently an assistant professor at the Department of Nanotechnology Engineering of Pukyong National University, and a former postdoctoral researcher at KAIST. The findings were published on the 3rd in the prestigious journal Nature Communications under the title: “Enantioselective Se lattices for stable chiroptoelectronic processing media.”

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Under the agreement, Rigetti will provide Norma with technical support for its 84-qubit quantum computer, which Norma plans to integrate with its proprietary Q Platform—a quantum program development and execution platform. This integration will enable Norma to deliver cloud-based quantum computing services to domestic research institutions, industries, and educational organizations.

The partnership extends beyond cloud services. Norma and Rigetti plan to jointly establish a quantum computing center in Korea, focusing on the development of quantum algorithms to solve complex problems in academia and industry. This collaboration signals a long-term vision of technological localization and the formation of a robust quantum ecosystem in Korea.

Founded in 2013 in Berkeley, California, Rigetti Computing is a full-stack quantum computing company known for its superconducting circuit-based quantum hardware and software. It went public on NASDAQ in March 2022 with a valuation of approximately $1.5 billion and operates branches in the U.K. and Australia.

To showcase the new offering, Norma will host a “Quantum Cloud Day” on June 19 at its Seoul headquarters, where it will provide a live demonstration of the 84-qubit cloud service. The company also plans to visit local institutions such as Daegu Gyeongbuk Institute of Science and Technology and Hallym University to explore academic-industry collaborations.

“This partnership is not just a technological alliance—it marks Korea’s official connection to the global quantum computing ecosystem,” said Hyun-cheol Jung, CEO of Norma. “We aim to begin pilot deployment of the quantum cloud service to public institutions, universities, and corporations in the second half of this year. This will lay the foundation for a domestic quantum technology hub centered around Norma.”

Mike Piech, Vice President Business Development at Rigetti Computing, emphasized the strategic importance of the deal: “We’re excited to see our joint efforts coming to fruition. Rigetti will actively support technical integration and collaborative research projects to help establish quantum technology in Korea.” The partnership is expected to strengthen Korea’s position in the global quantum race, supporting both domestic technology growth and international collaboration.

Norma has been expanding its footprint in quantum computing by leveraging its strengths in quantum-secure cryptography. In addition to its post-quantum cryptography (PQC) solution Q Care Connect, the firm has launched the Q Platform to support quantum application development. It is also accelerating the launch of Qrion, Korea’s first industrial quantum computer, to advance the practical application of quantum computing across sectors.

Quantum computing is increasingly seen as a game-changer for industries such as defense, aerospace, finance, pharmaceuticals, and gaming. Norma’s collaboration with Rigetti is positioned to deliver real-world Quantum Advantage, paving the way for the broad commercialization of quantum technologies in Korea.

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On the 22nd, MegazoneCloud announced a new collaboration with IonQ, a U.S.-based quantum computing company. The partnership aims to deliver IonQ’s quantum computing capabilities to Asian industries via the cloud, effectively launching a quantum business platform across the region. This comes after a memorandum of understanding (MOU) was signed between the two companies in September 2023. MegazoneCloud has already established multiple global partnerships in quantum space. In March last year, the company teamed up with Swiss quantum firm Terra Quantum, and in November, it began supporting Amazon Web Services (AWS)’s quantum service, Braket, for domestic use.

Globally, companies like Google, IBM, and Microsoft have led the quantum charge since the 2010s, investing heavily in R&D. Google further heightened interest last year with the unveiling of its next-generation quantum chip, Willow. However, due to the steep development costs and complex technical barriers, most quantum computing today is accessed via cloud services. Most companies and research institutes use quantum computing through IBM Quantum, Google Quantum AI, Microsoft Azure Quantum, and Amazon Braket.

In South Korea, the quantum computing sector is seen as being in a transitional phase, moving from pure R&D toward industrial application. While the government does offer quantum cloud access to universities and research institutions, commercial-grade QCaaS offerings remain absent.

“Many Korean companies recognize the potential of quantum computing but lack technology strategies,” said Brad Kim, Quantum Executive Officer at MegazoneCloud. “Various forms of quantum computing-based services, including QCaaS, are already being rolled out overseas, but Korean firms have yet to industrialize the technology.”

The potential market is vast. In June 2023, the report by the Electronics and Telecommunications Research Institute (ETRI) estimates that the global quantum technology market, including hardware, software, and services, will reach $106 billion by 2040. The report also forecasts that, because personal or mobile quantum computing is not feasible, cloud-based services will dominate the field. The market is expected to see a significant expansion starting in 2027.

However, hardware technology is necessary to provide quantum computing to the cloud, and Korea is expected to join hands with the U.S. Big Tech, as the technology needed for large-scale quantum computer manufacturing is still in the early R&D stage. ETRI’s report also highlights unresolved physical challenges in operating quantum systems as a major barrier.

For now, Korean MSPs are expected to lean on the expertise of global tech giants. However, this reliance could be a strategic advantage. Through global partnerships, state-of-the-art quantum computing resources and know-how can be quickly introduced and provided to domestic companies and research institutes to increase the practical utilization of quantum technology.

MegazoneCloud plans to apply quantum computing in various industries such as manufacturing, finance, and pharmaceutical development by integrating global resources such as AWS and IonQ on its quantum cloud platform, “M-Qloud,” targeting the Asian market.

An industry expert commented, “With quantum computing now available in the cloud, Korean companies and researchers can overcome previous cost and technical barriers. This approach shields them from the immediate lack of hardware technology.”

As the quantum computing industry remains in its early stages, South Korea’s government and research institutions are closely eyeing the opportunity to leapfrog into a competitive position.

The National Information Society Agency (NIA) noted that while quantum computing services delivered through external cloud platforms are gaining attention, they are not yet as systematically developed as conventional cloud services. “The ecosystem still lacks maturity in areas like service frameworks, software environments, and quantum simulators,” the agency explained. “There are two emerging models: one where companies like Google and IBM offer proprietary quantum environments, and another that supports a variety of quantum systems from third-party providers.”

The Electronics and Telecommunications Research Institute (ETRI) emphasized that quantum computing remains an early-stage market without a clear dominant player. “This creates a strategic opening for South Korea to catch up and secure a foothold in the sector,” the institute assessed.

The government is positioning quantum science as the “rice of future industries” and has upgraded its mid to long-term planning. Last year, it announced the ‘Quantum Science and Technology Vision and Strategy’, committing ₩3 trillion (approx. $2.2 billion) investments through 2035 and developing quantum computing systems and services by 2031.

There have been tangible results. In March, the Korea Institute of Standards and Science (KRISS) and the Korea Institute of Science and Technology (KISTI), Sungkyunkwan University (SKKU), and Ulsan Institute of Science and Technology (UNIST) succeeded in demonstrating a “Quantum Computing System Cloud” that remotely accesses quantum computing through web servers and meets user demand for the first time in Korea.

The research team plans to begin pilot operations in the second half of this year, offering access to selected domestic researchers in the quantum field. By 2026, the system is expected to scale up to 50-qubit-level quantum computing.

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Until now, the CPGE—an effect in which the direction of light’s circular polarization induces directional electric currents—had only been observed in three-dimensional Weyl semimetals. That changed with a breakthrough by Emeritus Professor Suk-Ho Choi’s team from the Department of Applied Physics at Kyung Hee University, which successfully proved that the same phenomenon occurs in 2D Weyl semimetals.

The researchers fabricated ultra-thin topological semimetal films—less than 10 nanometers thick—and created a 2D Weyl semimetal. The researchers observed in which direction the current flows when it is reflected in rotating light. As a result, a circular photosensitive mechanism effect in which the current changes depending on the direction of the light was found when the rotating light was illuminated. Furthermore, the electronic structure and physical mechanism in which the effect occurred were also identified.

Unlike bulky 3D materials, 2D Weyl semimetals, due to their ultra-thin and flexible nature, are far better suited for compact, integrated device development. This discovery is expected to advance core technologies such as quantum information processors and spin-based optoelectronic devices, which rely on controlling electron behavior through light. “This is a critical turning point that brings the field of topological materials—touted as the successor to graphene—from pure theory to practical application,” said Professor Choi. “It lays the foundation for high-performance energy conversion and optoelectronic devices and will significantly accelerate the realization of key future technologies like quantum computing.”

The study, supported by the Ministry of Science and ICT and the National Research Foundation of Korea, was conducted in collaboration with Ulsan University, the Australian National University, and the University of Wollongong. The findings were published in the latest issue of the international journal 『Materials Today Physics(IF=10)』.

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