In their pre-announcement in early March, Honeywell did disclose the expected Quantum Volume of the machine they expect to release soon. They also provided some data on the qubit quality in their technical paper and we have included that data in our Qubit Quality scorecard. But they did not actually mention the number of qubits they will have in that machine. We expect they will provide this information when they make an official announcement of this upcoming machine in a few months and we will include the qubit count in this table at that time.

Doug Finke
Managing Editor

Thank you for your comment. We have added QuEST to this Qubit Count list and also added it to our listing on the Tools page.

Doug Finke
Managing Editor

Jeff,

Thank you for your comment. The USTC announcement was that they have achieved an 18 qubit quantum entanglement. That is much different from developing a fully programmable gate level quantum computer so it would not be accurate to compare it to the other entries shown in the table.

We are always interested in updates. I noticed that the Alibaba Cloud announcement is almost two years old now so that announcement is a little dated now.

Doug Finke
Managing Editor

USTC announced 18 qubits in 2018: https://quantum.ustc.edu.cn/web/en/node/575

Not sure if you thought this was the same as Aliyun (Alibaba Cloud) with Chinese Academy of Sciences where we have an account and have run a job on their quantum computer. in 2018, they had 11 qubits.
I think they are separate.
https://www.alibabacloud.com/press-room/alibaba-cloud-and-cas-launch-one-of-the-worlds-most?spm=a2c5t.10695662.1996646101.searchclickresult.3dd067bcpanJuq

I may suggest a few updates. We are updating our website over the coming days in preparation for a conference talk.

First, Xanadu’s technology is based upon qumodes instead of qubits. The difference is that qumodes encode information as a continuous variable. And second, Xanadu has not released publicly any information on how many qumodes they have in each system. When they release this information, we will include it in this table.

Doug Finke
Managing Editor

You are correct that the original design was for 20 qubits. However, one qubit wasn’t working properly so Rigetti documented this as 19 qubits. This chip is being superseded by Rigetti’s new Aspen architecture which will shortly have versions with many more qubits.

Doug Finke
Managing Editor