Moving a logical quantum state puts error tolerance to the test
A surface-code experiment studies when encoded information survives imperfect teleportation. Both code patches sit on the same superconducting processor.
Yiren Zou and colleagues’ Nature Physics study, published October 22, tests when logical information remains recoverable under imperfect teleportation. Its preprint has been public since February 24, 2026. The new milestone is publication, with a protocol and its limits now available to inspect.[1][2]
The preprint describes two interlaced surface-code patches on one 125-qubit superconducting processor, with code distances up to seven. Entangling operations, measurements and classical decoding support the transfer. Both patches share the processor; this is not a demonstrated link between remote computers.[2]
That distinction changes the reader’s next question. Moving information within an experimental system and connecting separate systems present different integration problems. A successful demonstration of one should not silently become a claim about the other. The archival image shows Chalmers’ three-qubit processor from 2017, which is different hardware from the device in this experiment.
The final supplement treats integration with repeated as further work. An encoded-state transfer and a continuously protected computation are therefore separate milestones. The latter cannot be inferred merely because an experiment uses a code: protection has to remain effective through the operations required by the larger task.[3]
Encoding changes the question from moving one ’s state to preserving information represented across a collection of qubits. The supporting classical information remains part of the protocol. Quantum teleportation transfers a state using shared quantum resources and ordinary communication; it does not transport matter or provide faster-than-light signalling.
The next informative test would combine transfer with the repeated correction needed during a longer computation, while accounting for the extra measurements, resets and errors. That would connect this study’s recoverability question to an operating system’s reliability. Code size, transfer quality and sustained protection should remain separate quantities until a common experiment measures them together.