Quantum state transfer through time reversal of an optical channel

M. R. Hush, C. D. B. Bentley, R. L. Ahlefeldt, M. R. James, M. J. Sellars, and V. Ugrinovskii
Phys. Rev. A 94, 062302 – Published 5 December 2016

Abstract

Rare-earth ions have exceptionally long coherence times, making them an excellent candidate for quantum information processing. A key part of this processing is quantum state transfer. We show that perfect state transfer can be achieved by time reversing the intermediate quantum channel, and suggest using a gradient echo memory (GEM) to perform this time reversal. We propose an experiment with rare-earth ions to verify these predictions, where an emitter and receiver crystal are connected with an optical channel passed through a GEM. We investigate the effect experimental imperfections and collective dynamics have on the state transfer process. We demonstrate that super-radiant effects can enhance coupling into the optical channel and improve the transfer fidelity. We lastly discuss how our results apply to state transfer of entangled states.

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  • Received 22 May 2016
  • Revised 31 October 2016

DOI:https://doi.org/10.1103/PhysRevA.94.062302

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

M. R. Hush1,*, C. D. B. Bentley2,†, R. L. Ahlefeldt3,4, M. R. James5,6, M. J. Sellars4,6, and V. Ugrinovskii1

  • 1School of Engineering and Information Technology, University of New South Wales at the Australian Defence Force Academy, Canberra, ACT 2600, Australia
  • 2Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia
  • 3Department of Physics, Montana State University, Bozeman, Montana 59717, USA
  • 4Laser Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra 2601, Australia
  • 5Research School of Engineering, Australian National University, Canberra, ACT 2601, Australia
  • 6ARC Centre for Quantum Computation and Communication Technology, Research School of Engineering, Australian National University, Canberra, ACT 2601, Australia

  • *m.hush@unsw.edu.au
  • Current address: Max-Planck-Institute for the Physics of Complex Systems, D-01187 Dresden, Germany.

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Issue

Vol. 94, Iss. 6 — December 2016

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