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Advance in Quantum Error Correction


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A new quantum error correcting code requires measurements of only a few quantum bits at a time, to ensure consistency between one stage of a computation and the next.

Researchers from the Massachusetts Institute of Technology, Google, the University of Sydney, and Cornell University have developed a quantum error correction code that only needs to measure a few quantum bits at a time.

Credit: Jose-Luis Olivares/MIT

Researchers from the Massachusetts Institute of Technology (MIT), Google, the University of Sydney, and Cornell University have developed a quantum error correction code that requires the measurement of only a few quantum bits at a time. The protocol corrects almost all errors in quantum memory.

A key design element for quantum computers, quantum error correction helps preserve the fragile quantum states on which quantum computation depends. The approach helps ensure that errors are spread through the qubits in a lawful way. In this way, measurements made on the final state of qubits are guaranteed to reveal relationships between qubits without exposing their values. If an error is detected, the protocol can trace it back to its origin and correct it.

Still, the team notes the approach could potentially duplicate banks of qubits, although some experts are not overly concerned about the prospect of additional qubits. MIT professor Aram Harrow says some redundancy in the hardware will likely be a necessity to ensure the efficiency of the scheme.

From MIT News
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