Physics – Quantum Physics
Scientific paper
2009-12-20
Phys. Rev. A 81, 032314 (2010)
Physics
Quantum Physics
12 pages, 3 figures
Scientific paper
10.1103/PhysRevA.81.032314
We show that an ensemble of identical d-level atoms can be efficiently described by d-1 collective oscillator degrees of freedom in the vicinity of a product state with all atoms in the same, but otherwise arbitrary single-particle state. We apply our description to two different kinds of spin squeezing: (i) when each spin-F atom is individually squeezed without creating interatomic entanglement and (ii) when a particular collective atomic oscillator mode is squeezed via quantum non-demolition (QND) measurement and feedback. When combined in sequence, the order of the two methods is relevant in the final degree of squeezing. We also discuss the role of the two kinds of squeezing when multi-sublevel atoms are used as quantum memories for light.
Kurucz Zoltan
Mølmer Klaus
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