Atomic Quantum Memory for Photonic Qubits via Scattering in Cavity QED

Details Atomic Quantum Memory for Photonic Qubits via Scattering in Cavity QED Atomic Quantum Memory for Photonic Qubits via Scattering in Cavity QED

2005-06-26

arxiv.org/abs/quant-ph/0506215v1

Physics

Quantum Physics

4 pages

Scientific paper

We investigate a scheme of atomic quantum memory to store photonic qubits in cavity QED. This is motivated on the recent observation that the quantum-state swapping between a single-photon pulse and a Lambda-type atom trapped in a cavity is ideally realized via scattering for some specific case in the strong coupling cavity regime [T. W. Chen, C. K. Law, and P. T. Leung, Phys. Rev. A 69, 063810 (2004)]. We derive a simple formula for calculating the fidelity of this atom-photon swapping for quantum memory. We further propose a feasible method which implements conditionally the quantum memory operation with the fidelity of almost unity even if the atom-photon coupling is not so strong. This method can also be applied to store a photonic entanglement in spatially separated atomic quantum memories.

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