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Heralded Storage of a Photonic Quantum Bit in a Single Atom

Norbert Kalb, Andreas Reiserer, Stephan Ritter, and Gerhard Rempe
Phys. Rev. Lett. 114, 220501 – Published 2 June 2015
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Abstract

Combining techniques of cavity quantum electrodynamics, quantum measurement, and quantum feedback, we have realized the heralded transfer of a polarization qubit from a photon onto a single atom with 39% efficiency and 86% fidelity. The reverse process, namely, qubit transfer from the atom onto a given photon, is demonstrated with 88% fidelity and an estimated efficiency of up to 69%. In contrast to previous work based on two-photon interference, our scheme is robust against photon arrival-time jitter and achieves much higher efficiencies. Thus, it constitutes a key step toward the implementation of a long-distance quantum network.

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  • Received 23 March 2015

DOI:https://doi.org/10.1103/PhysRevLett.114.220501

© 2015 American Physical Society

Synopsis

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Heralded Qubit Transfer

Published 2 June 2015

A scheme based on an atom trapped in a cavity faithfully transfers a qubit state between a photon and the atom.

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Authors & Affiliations

Norbert Kalb*, Andreas Reiserer*, Stephan Ritter, and Gerhard Rempe

  • Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

  • *Present address: Kavli Institute of Nanoscience Delft, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
  • stephan.ritter@mpq.mpg.de

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Issue

Vol. 114, Iss. 22 — 5 June 2015

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