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

  • Author(s): Zhong, YP;
  • Wang, ZL;
  • Martinis, JM;
  • Cleland, AN;
  • Korotkov, AN;
  • Wang, H
  • et al.

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.

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