Complete Physical Characterization of Quantum Nondemolition Measurements via Tomography

L. Pereira, J. J. García-Ripoll, and T. Ramos
Phys. Rev. Lett. 129, 010402 – Published 29 June 2022
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Abstract

We introduce a self-consistent tomography for arbitrary quantum nondemolition (QND) detectors. Based on this, we build a complete physical characterization of the detector, including the measurement processes and a quantification of the fidelity, ideality, and backaction of the measurement. This framework is a diagnostic tool for the dynamics of QND detectors, allowing us to identify errors, and to improve their calibration and design. We illustrate this on a realistic Jaynes-Cummings simulation of a superconducting qubit readout. We characterize nondispersive errors, quantify the backaction introduced by the readout cavity, and calibrate the optimal measurement point.

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  • Received 29 September 2021
  • Accepted 3 June 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.010402

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

L. Pereira*, J. J. García-Ripoll, and T. Ramos

  • Instituto de Física Fundamental IFF-CSIC, Calle Serrano 113b, Madrid 28006, Spain

  • *luciano.ivan@iff.csic.es
  • t.ramos.delrio@gmail.com

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Issue

Vol. 129, Iss. 1 — 1 July 2022

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