Physics – Quantum Physics
Scientific paper
2010-08-13
Phys. Rev. A 82, 042309 (2010)
Physics
Quantum Physics
7 pages, 3 figures
Scientific paper
10.1103/PhysRevA.82.042309
It has been shown that an inhomogeneously broadened optical transition shaped into an atomic frequency comb can store a large number of temporal modes of the electromagnetic field at the single photon level without the need to increase the optical depth of the storage material. The readout of light modes is made efficient thanks to the rephasing of the optical-wavelength coherence similarly to photon echo-type techniques and the re-emission time is given by the comb structure. For on-demand readout and long storage times, two control fields are used to transfer back and forth the optical coherence into a spin wave. Here, we present a detailed analysis of the spin wave storage based on chirped adiabatic control fields. In particular, we verify that chirped fields require significantly weaker intensities than $\pi$-pulses. The price to pay is a reduction of the multimode storage capacity that we quantify for realistic material parameters associated with solids doped with rare-earth-metal ions.
Afzelius Mikael
Gisin Nicolas
Minář Jiří
Riedmatten Hugues de
Sangouard Nicolas
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