Energetics of a Single Qubit Gate

J. Stevens, D. Szombati, M. Maffei, C. Elouard, R. Assouly, N. Cottet, R. Dassonneville, Q. Ficheux, S. Zeppetzauer, A. Bienfait, A. N. Jordan, A. Auffèves, and B. Huard
Phys. Rev. Lett. 129, 110601 – Published 9 September 2022
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Abstract

Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qubit and the controller that implements the gate? Here we exploit a superconducting platform to answer this question in the case of a quantum gate realized by a resonant drive field. During the gate, the superconducting qubit becomes entangled with the microwave drive pulse so that there is a quantum superposition between energy flows. We measure the energy change in the drive field conditioned on the outcome of a projective qubit measurement. We demonstrate that the drive’s energy change associated with the measurement backaction can exceed by far the energy that can be extracted by the qubit. This can be understood by considering the qubit as a weak measurement apparatus of the driving field.

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  • Received 21 October 2021
  • Revised 19 August 2022
  • Accepted 24 August 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.110601

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyStatistical Physics & Thermodynamics

Authors & Affiliations

J. Stevens1, D. Szombati1, M. Maffei2, C. Elouard3, R. Assouly1, N. Cottet1, R. Dassonneville1, Q. Ficheux1, S. Zeppetzauer1, A. Bienfait1, A. N. Jordan4,5, A. Auffèves2, and B. Huard1

  • 1Ecole Normale Supérieure de Lyon, CNRS, Laboratoire de Physique, F-69342 Lyon, France
  • 2CNRS and Université Grenoble Alpes, Institut Néel, F-38042 Grenoble, France
  • 3QUANTIC team, INRIA de Paris, 2 Rue Simone Iff, 75012 Paris, France
  • 4Institute for Quantum Studies, Chapman University, 1 University Drive, Orange, California 92866, USA
  • 5Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA

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Issue

Vol. 129, Iss. 11 — 9 September 2022

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