Reducing intrinsic decoherence in a superconducting circuit by quantum error detection

Abstract

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.

10 pages, 5 figures, and 1 table including Supplementary Information

References in corpus (8)

• Superconducting Circuits and Quantum Information
• Dynamical decoupling and noise spectroscopy with a superconducting flux qubit
• Superconducting qubit in waveguide cavity with coherence time approaching 0.1ms
• Quantum feedback control of a superconducting qubit: Persistent Rabi oscillations
• Fidelity of quantum operations
• Undoing a weak quantum measurement of a solid-state qubit
• Experimental demonstration of topological error correction
• Feedback control of a solid-state qubit using high-fidelity projective measurement

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• Quantum delayed-choice experiment with a beam splitter in a quantum superposition
• Suppression of dephasing by qubit motion in superconducting circuits
• Coherent control via weak measurements in ${}^{31}$P single-atom electron and nuclear spin qubits
• Two-time weak measurement protocol for ergotropy protection in open quantum batteries
• Implementing generalized measurements with superconducting qubits
• Suppressing Amplitude Damping in Trapped Ions: Discrete Weak Measurements for a Non-unitary Probabilistic Noise Filter
• Bacon-Shor code with continuous measurement of non-commuting operators
• Universal set of Dynamically Protected Gates for Bipartite Qubit Networks II: Soft Pulse Implementation of the [[5,1,3]] Quantum Error Correcting Code