Quantum Hypercube States

L. A. Howard, T. J. Weinhold, F. Shahandeh, J. Combes, M. R. Vanner, A. G. White, and M. Ringbauer
Phys. Rev. Lett. 123, 020402 – Published 10 July 2019
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Abstract

We introduce quantum hypercube states, a class of continuous-variable quantum states that are generated as orthographic projections of hypercubes onto the quadrature phase space of a bosonic mode. In addition to their interesting geometry, hypercube states display phase-space features much smaller than Planck’s constant, and a large volume of Wigner negativity. We theoretically show that these features make hypercube states sensitive to displacements at extremely small scales in a way that is surprisingly robust to initial thermal occupation and to small separation of the superposed state components. In a high-temperature proof-of-principle optomechanics experiment we observe, and match to theory, the signature outer-edge vertex structure of hypercube states.

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  • Received 14 November 2018
  • Revised 27 February 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.020402

© 2019 American Physical Society

Physics Subject Headings (PhySH)

General Physics

Authors & Affiliations

L. A. Howard1, T. J. Weinhold1, F. Shahandeh2, J. Combes1, M. R. Vanner3, A. G. White1, and M. Ringbauer4

  • 1Centre for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Brisbane, Australia
  • 2Department of Physics, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom
  • 3QOLS, Blackett Laboratory, Imperial College London, London, United Kingdom
  • 4Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria

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Issue

Vol. 123, Iss. 2 — 12 July 2019

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