Entanglement fidelity of quantum memories

Details Entanglement fidelity of quantum memories Entanglement fidelity of quantum memories

2006-08-11

arxiv.org/abs/quant-ph/0608098v3

Phys. Rev. A (74), 050302(R) (2006)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.74.050302

We introduce a figure of merit for a quantum memory which measures the preservation of entanglement between a qubit stored in and retrieved from the memory and an auxiliary qubit. We consider a general quantum memory system consisting of a medium of two level absorbers, with the qubit to be stored encoded in a single photon. We derive an analytic expression for our figure of merit taking into account Gaussian fluctuations in the Hamiltonian parameters, which for example model inhomogeneous broadening and storage time dephasing. Finally we specialize to the case of an atomic quantum memory where fluctuations arise predominantly from Doppler broadening and motional dephasing.

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