Demonstration of a quantum error detection code using a square lattice of four superconducting qubits

A.D. Córcoles (), Easwar Magesan, Srikanth J. Srinivasan, Andrew W. Cross, M. Steffen, Jay M. Gambetta and Jerry M. Chow
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A.D. Córcoles: IBM T.J. Watson Research Center
Easwar Magesan: IBM T.J. Watson Research Center
Srikanth J. Srinivasan: IBM T.J. Watson Research Center
Andrew W. Cross: IBM T.J. Watson Research Center
M. Steffen: IBM T.J. Watson Research Center
Jay M. Gambetta: IBM T.J. Watson Research Center
Jerry M. Chow: IBM T.J. Watson Research Center

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract The ability to detect and deal with errors when manipulating quantum systems is a fundamental requirement for fault-tolerant quantum computing. Unlike classical bits that are subject to only digital bit-flip errors, quantum bits are susceptible to a much larger spectrum of errors, for which any complete quantum error-correcting code must account. Whilst classical bit-flip detection can be realized via a linear array of qubits, a general fault-tolerant quantum error-correcting code requires extending into a higher-dimensional lattice. Here we present a quantum error detection protocol on a two-by-two planar lattice of superconducting qubits. The protocol detects an arbitrary quantum error on an encoded two-qubit entangled state via quantum non-demolition parity measurements on another pair of error syndrome qubits. This result represents a building block towards larger lattices amenable to fault-tolerant quantum error correction architectures such as the surface code.

Date: 2015
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DOI: 10.1038/ncomms7979

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