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Quantum Electronics and Laser Science Conference

Quantum optics with trapped photon states: coherent memory for light

Mikhail D. Lukin, Michael Fleischhauer, Susanne F. Yelin, A. Fleischhauer, A. Mair, David F. Phillips, R. L. Walsworth, L.-M. Duan, J. I. Cirac, P. Zoller

Published Nov 13, 2002• 0 citations
Publisher

Abstract

Summary form only given. We describe a technique that allows one to transfer quantum correlations from traveling-wave light fields to collective atomic states and vice versa with nearly ideal efficiency. This is achieved by adiabatically reducing the group velocity of light to zero, thereby "trapping" the photons in the medium.
DOI
10.1109/qels.2001.961822

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We describe a general technique that allows for an ideal transfer of quantum correlations between light fields and metastable states of matter. The technique is based on trapping quantum states of photons in coherently driven atomic media, in which the group velocity is adiabatically reduced to zero. We discuss possible applications such as quantum state memories, generation of squeezed atomic states, preparation of entangled atomic ensembles, quantum information processing, and quantum networking.
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A coherent technique for the control of photon propagation in optically thick media and its application for quantum memories is discussed. Raman adiabatic passage with an externally controlled Stokes field can be used to transfer the quantum state of a light pulse (``flying'' qubit) to a collective spin-excitation (stationary qubit) and thereby slow down its propagation velocity to zero. The process is reversible and has a potential fidelity of unity without the necessity for strongly coupling resonators. A simple quasi-particle picture (dark-state polariton) of the transfer is presented. The analytic theory is supplemented with exact numerical solutions. Finally the influence of decoherence mechanisms on collective storage states, which are N-particle entangled states, is analyzed.
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