Reducing the impact of intrinsic dissipation in a superconducting circuit by quantum error detection

Y. P. Zhong, Z. L. Wang, J. M. Martinis, A. N. Cleland, A. N. Korotkov and H. Wang ()
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Y. P. Zhong: Zhejiang University
Z. L. Wang: Zhejiang University
J. M. Martinis: University of California
A. N. Cleland: University of California
A. N. Korotkov: University of California
H. Wang: Zhejiang University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract A fundamental challenge for quantum information processing is reducing the impact of environmentally induced errors. Here we demonstrate a quantum error detection and rejection protocol based on the idea of quantum uncollapsing, using this protocol to reduce the impact of energy relaxation owing to the environment in a three-qubit superconducting circuit. We encode quantum information in a target qubit, and use the other two qubits to detect and reject errors caused by energy relaxation. This protocol improves the storage time of a quantum state by a factor of roughly three, at the cost of a reduced probability of success. This constitutes the first experimental demonstration of the algorithm-based improvement in the lifetime of a quantum state stored in a qubit.

Date: 2014
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DOI: 10.1038/ncomms4135

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