[ExI] Quantum computer news for September

[John Clark]

*There have been some important developments in the field of quantum
computing during September, for example:*

*A 3,000 quantum-bit system capable of continuous operation*
<https://news.harvard.edu/gazette/story/2025/09/clearing-significant-hurdle-to-quantum-computing/>

*In their paper from the September 15, 2025 issue of the journal Nature:*


*Continuous operation of a coherent 3,000-qubit system
<https://www.nature.com/articles/s41586-025-09596-6>*

*The authors say: *

*"Our results pave the way for realization of large-scale continuously
operated atomic clocks, sensors, and fault-tolerant quantum computers.
[...]  We demonstrated the continuous operation with a 3,000-qubit
system, but it's also clear that this approach will work for much larger
numbers as well. [...]  We're showing a way where you can insert new atoms
as you naturally lose them without destroying the information that's
already in the system."*

*There is a second paper of interest published in Nature on September 10. *

*Probing the Kitaev honeycomb model on a neutral-atom quantum computer*
<https://www.nature.com/articles/s41586-025-09475-0>

*Researchers found a way to configure atomic arrays so they simulate
quantum magnets, this allows them to change the connectivity between
quantum processors during computation. One of the authors of the paper said
"We can literally reconfigure the atomic quantum computer while it's
operating. Basically, the system becomes a living organism."*

*And there is a third paper from Nature published on September 24, a team
demonstrated a new method of quantum error correction:*

*Low-overhead transversal fault tolerance for universal quantum computation
<https://www.nature.com/articles/s41586-025-09543-5> *

*The lead author said he thinks with this new method it should be possible
to build a quantum computer that can execute billions of operations and
continue running for days and "Realizing this dream is now in our direct
sight for the first time, ever. One can really see a very direct path
towards realizing it"*

*In a fourth development the quantum computer company "Alice and Bob"
announced a few days ago that they have produced superconducting "quantum
cat "cubits that remain resistant to flip errors for more than an hour, the
previous record was seven minutes. *

*Alice & Bob Shares Preliminary Results Vastly Surpassing Previous Bit-Flip
Time Record*
<https://alice-bob.com/newsroom/alice-bob-surpasses-bit-flip-stability-record/>

*John K Clark    *
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