State preservation by repetitive error detection in a superconducting quantum circuit

Nature
J KellyJohn M Martinis

Abstract

Quantum computing becomes viable when a quantum state can be protected from environment-induced error. If quantum bits (qubits) are sufficiently reliable, errors are sparse and quantum error correction (QEC) is capable of identifying and correcting them. Adding more qubits improves the preservation of states by guaranteeing that increasingly larger clusters of errors will not cause logical failure-a key requirement for large-scale systems. Using QEC to extend the qubit lifetime remains one of the outstanding experimental challenges in quantum computing. Here we report the protection of classical states from environmental bit-flip errors and demonstrate the suppression of these errors with increasing system size. We use a linear array of nine qubits, which is a natural step towards the two-dimensional surface code QEC scheme, and track errors as they occur by repeatedly performing projective quantum non-demolition parity measurements. Relative to a single physical qubit, we reduce the failure rate in retrieving an input state by a factor of 2.7 when using five of our nine qubits and by a factor of 8.5 when using all nine qubits after eight cycles. Additionally, we tomographically verify preservation of the non-classical Greenber...Continue Reading

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Citations

May 31, 2016·Nature Physics·Matti PartanenMikko Möttönen
Dec 1, 2015·Physical Chemistry Chemical Physics : PCCP·Humberto G LagunaAlán Aspuru-Guzik
Mar 18, 2016·Nature Communications·Yun-Pil Shim, Charles Tahan
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May 28, 2016·Science·Chen WangR J Schoelkopf
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