Reducing the impact of intrinsic dissipation in a superconducting circuit by quantum error detection.
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.
Department of Physics, Zhejiang University, Hangzhou 310027 China.
Y P
YP
Zhong
Department of Physics, Zhejiang University, Hangzhou 310027 China.
Z L
ZL
Wang
Department of Physics, University of California, Santa Barbara, California 93106 USA.
J M
JM
Martinis
Department of Physics, University of California, Santa Barbara, California 93106 USA.
A N
AN
Cleland
Department of Electrical Engineering, University of California, Riverside, California 92521, USA.
A N
AN
Korotkov
1] Department of Physics, Zhejiang University, Hangzhou 310027 China [2] Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
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H
Wang