Photon echoes generated by reversing magnetic field gradients in a rubidium vapour

Details Photon echoes generated by reversing magnetic field gradients in a rubidium vapour Photon echoes generated by reversing magnetic field gradients in a rubidium vapour

2008-06-26

arxiv.org/abs/0806.4258v3

Optics Letters, Vol. 33, Issue 20, pp. 2323-2325 (2008)

Physics

Quantum Physics

Scientific paper

10.1364/OL.33.002323

We propose a photon echo quantum memory scheme using detuned Raman coupling to long lived ground states. In contrast to previous 3-level schemes based on controlled reversible inhomogeneous broadening that use sequences of $\pi$-pulses, the scheme does not require accurate control of the coupling dynamics to the ground states. We present a proof of principle experimental realization of our proposal using rubidium atoms in a warm vapour cell. The Raman resonance line is broadened using a magnetic field that varies linearly along the direction of light propagation. Inverting the magnetic field gradient rephases the atomic dipoles and re-emits the light pulse in the forward direction.

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