A BEC as a quantum memory for the polarisation of light

POSTER

Abstract

The polarisation of light is a much-used workhorse in quantum cryptography and quantum-information applications. We experimentally realise a quantum memory for arbitrary polarisation states of a light pulse, using an atomic multilevel scheme and electromagnetically induced transparency (EIT) in a Bose-Einstein condensate (BEC). In the experiment, the energy of the retrieved light pulse reaches values as high as 50\% of the incoming light pulse. Furthermore, the observed fidelity of the polarisation state after the readout reaches values up to 99\%.

Authors

  • Stefan Riedl

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany

  • Matthias Lettner

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany

  • Christoph Vo

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany

  • Simon Baur

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany

  • Stephan D\"{u}rr

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany

  • Gerhard Rempe

    • Max-Planck-Institut f\"{u}r Quantenoptik, Hans-Kopfermann-Stra{\ss}e 1, 85748 Garching, Germany