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Measuring the quadrature coherence scale on a cloud quantum computer

Aaron Z. Goldberg1,2, Guillaume S. Thekkadath1, and Khabat Heshami1,2,3

  • 1National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1N 5A2
  • 2Department of Physics, University of Ottawa, Advanced Research Complex, 25 Templeton Street, Ottawa, Ontario, Canada K1N 6N5
  • 3Institute for Quantum Science and Technology, Department of Physics and Astronomy, University of Calgary, Alberta, Calgary, Canada T2N 1N4

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Phys. Rev. A 107, 042610 – Published 14 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.042610

Abstract

Coherence underlies quantum phenomena, yet it is manifest in classical theories; delineating coherence's role is a fickle business. The quadrature coherence scale (QCS) was invented to remove such ambiguity, quantifying quantum features of any single-mode bosonic system without choosing a preferred orientation of phase space. The QCS is defined for any state, reducing to well-known quantities in appropriate limits, including Gaussian and pure states, and perhaps most importantly for a coherence measure, it is highly sensitive to decoherence. Until recently, it was unknown how to measure the QCS; we here report on an initial measurement of the QCS for squeezed light and thermal states of light. This is performed using Xanadu's machine Borealis, accessed through the cloud, which offers the configurable beam splitters and photon-number-resolving detectors essential for measuring the QCS. The data and theory match well, certifying the usefulness of interferometers and photon-counting devices in certifying quantumness.

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Phys. Rev. A 107, 042610– Published 14 April, 2023
  • Received 18 January 2023
  • Accepted 22 March 2023
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