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Bulletin of the American Physical Society

Quantum Communication Between Distant Superconducting Circuits Combined With Fast, High-Fidelity Readout

Simon Storz, Paul Magnard, Josua Schär, Philipp Kurpiers, Jean-Claude Besse, Kevin Reuer, Mihai S. Gabureac, Abdulkadir Akın, Baptiste Royer, Alexandre Blais, Andreas J. Wallraff

Published Mar 19, 2021• 0 citations
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Physical implementations of qubits can be extremely sensitive to environmental coupling, which can result in decoherence. While efforts are made for protection, coupling to the environment is necessary to measure and manipulate the state of the qubit. As such, the goal of having long qubit energy relaxation times is in competition with that of achieving high-fidelity qubit control and measurement. Here, we propose a method that integrates filtering techniques for preserving superconducting qubit lifetimes together with the dispersive coupling of the qubit to a microwave resonator for control and measurement. The result is a compact circuit that protects qubits from spontaneous loss to the environment, while also retaining the ability to perform fast, high-fidelity readout. Importantly, we show the device operates in a regime that is attainable with current experimental parameters and provide a specific example for superconducting qubits in circuit quantum electrodynamics.