Memory for Light as a Quantum Process

M. Lobino, C. Kupchak, E. Figueroa, and A. I. Lvovsky
Phys. Rev. Lett. 102, 203601 – Published 19 May 2009

Abstract

We report complete characterization of an optical memory based on electromagnetically induced transparency. We recover the superoperator associated with the memory, under two different working conditions, by means of a quantum process tomography technique that involves storage of coherent states and their characterization upon retrieval. In this way, we can predict the quantum state retrieved from the memory for any input, for example, the squeezed vacuum or the Fock state. We employ the acquired superoperator to verify the nonclassicality benchmark for the storage of a Gaussian distributed set of coherent states.

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  • Received 21 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.203601

©2009 American Physical Society

Authors & Affiliations

M. Lobino1, C. Kupchak1, E. Figueroa1,2, and A. I. Lvovsky1,*

  • 1Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada
  • 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

  • *lvov@ucalgary.ca

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Issue

Vol. 102, Iss. 20 — 22 May 2009

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