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Q: Quantenoptik
Q 7: Quantum Information II
Q 7.3: Talk
Monday, April 2, 2001, 18:00–18:15, Audimax
Collective Quantum Memories for Photons Based on Dark-State Polaritons — •Michael Fleischhauer1, Mikhail Lukin2, and Ronald Walsworth2 — 1Fachbereich Physik, Univ. Kaiserslautern — 2ITAMP, Harvard-Smithsonian Center
Photons are the fastest and most robust carriers of quantum information, but this information is hard to store. A technique for a loss-free and reversible transfer of the quantum state of photon wave-packets (flying qubits) to collective atomic excitations (stationary qubits) based on so-called dark-state polaritons (DSP) is described [1]. No strongly-coupling resonators nor extreme control of atomic positions as in single-atom cavity QED are required. DSP’s are superpositions of elm. and collective atomic excitations, whose mixing angle can be externally controlled. Adiabatic rotation from a pure elm. to a pure atomic excitation leads to a decelleration and full stop of an initial photon wavepacket. Reversing the rotation at a later time allows to release the wavepacket. Application of this technique for quantum memories are discussed and first experimental results presented.
[1] M. Fleischhauer, M.D.Lukin, Phys.Rev.Lett. 84 (2000) 5094