Enhancing the capacity and performance of collective atomic quantum memory

Details Enhancing the capacity and performance of collective atomic quantum memory Enhancing the capacity and performance of collective atomic quantum memory

2005-02-22

arxiv.org/abs/quant-ph/0502135v2

Phys. Rev. Lett. 95, 053602 (2005)

Physics

Quantum Physics

4 pages, 3 figures; minor changes in text and figs, more discussion on quantum information processing. To appear in Phys. Rev.

Scientific paper

10.1103/PhysRevLett.95.053602

Present schemes involving the quantum non-demolition interaction between atomic samples and off-resonant light pulses allow us to store quantum information corresponding to a single harmonic oscillator (mode) in one multiatomic system. We discuss the possibility to involve several coherences of each atom so that the atomic sample can store information contained in several quantum modes. This is achieved by the coupling of different magnetic sublevels of the relevant hyperfine level by additional Raman pulses. This technique allows us to design not only the quantum non-demolition coupling, but also beam splitterlike and two-mode squeezerlike interactions between light and collective atomic spin.

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