Detecting bit-flip errors in a logical qubit using stabilizer measurements

Quantum data are susceptible to decoherence induced by the environment and to errors in the hardware processing it. A future fault-tolerant quantum computer will use quantum error correction to actively protect against both. In the smallest error correction codes, the information in one logical qubit is encoded in a two-dimensional subspace of a larger Hilbert space of multiple physical qubits. For each code, a set of non-demolition multi-qubit measurements, termed stabilizers, can discretize and signal physical qubit errors without collapsing the encoded information. Here using a five-qubit superconducting processor, we realize the two parity measurements comprising the stabilizers of the three-qubit repetition code protecting one logical qubit from physical bit-flip errors. While increased physical qubit coherence times and shorter quantum error correction blocks are required to actively safeguard the quantum information, this demonstration is a critical step towards larger codes based on multiple parity measurements.

DOI

10.1038/ncomms7983

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Ristè, D, Poletto, S, Huang, M Z, Bruno, A, Vesterinen, V, Saira, O P & Dicarlo, L 2015, 'Detecting bit-flip errors in a logical qubit using stabilizer measurements', Nature Communications, vol. 6, 6983. https://doi.org/10.1038/ncomms7983

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https://urn.fi/URN:NBN:fi:aalto-202103222417

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[article-cris] Perustieteiden korkeakoulu / SCI

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Detecting bit-flip errors in a logical qubit using stabilizer measurements

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