High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity

M. D. Reed, L. DiCarlo, B. R. Johnson, L. Sun, D. I. Schuster, L. Frunzio, and R. J. Schoelkopf
Phys. Rev. Lett. 105, 173601 – Published 19 October 2010
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Abstract

We demonstrate a qubit readout scheme that exploits the Jaynes-Cummings nonlinearity of a superconducting cavity coupled to transmon qubits. We find that, in the strongly driven dispersive regime of this system, there is the unexpected onset of a high-transmission “bright” state at a critical power which depends sensitively on the initial qubit state. A simple and robust measurement protocol exploiting this effect achieves a single-shot fidelity of 87% using a conventional sample design and experimental setup, and at least 61% fidelity to joint correlations of three qubits.

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  • Received 10 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.173601

© 2010 The American Physical Society

Authors & Affiliations

M. D. Reed, L. DiCarlo, B. R. Johnson, L. Sun, D. I. Schuster, L. Frunzio, and R. J. Schoelkopf

  • Departments of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520, USA

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Vol. 105, Iss. 17 — 22 October 2010

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