Photon echoes generated by reversing magnetic field gradients in a rubidium vapor
Abstract
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.
- Publication:
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Optics Letters
- Pub Date:
- October 2008
- DOI:
- 10.1364/OL.33.002323
- arXiv:
- arXiv:0806.4258
- Bibcode:
- 2008OptL...33.2323H
- Keywords:
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- Quantum Physics
- E-Print:
- Optics Letters, Vol. 33, Issue 20, pp. 2323-2325 (2008)