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

D. Ristè, S. Poletto, M.-Z. Huang, A. Bruno, V. Vesterinen, O.-P. Saira and L. DiCarlo ()
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D. Ristè: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
S. Poletto: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
M.-Z. Huang: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
A. Bruno: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
V. Vesterinen: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
O.-P. Saira: QuTech and Kavli Institute of Nanoscience, Delft University of Technology
L. DiCarlo: QuTech and Kavli Institute of Nanoscience, Delft University of Technology

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms7983

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