A fundamental challenge for quantum information processing is reducing the impact of environmentally-induced errors. Quantum error detection (QED) provides one approach to handling such errors, in which errors are rejected when they are detected. Here we demonstrate a QED protocol based on the idea of quantum un-collapsing, using this protocol to suppress energy relaxation due 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 an algorithm-based improvement in the lifetime of a quantum state stored in a qubit.
@article{arxiv.1309.0198,
title = {Reducing intrinsic decoherence in a superconducting circuit by quantum error detection},
author = {Y. P. Zhong and Z. L. Wang and John M. Martinis and A. N. Cleland and A. N. Korotkov and H. Wang},
journal= {arXiv preprint arXiv:1309.0198},
year = {2014}
}
Comments
10 pages, 5 figures, and 1 table including Supplementary Information