Generation of Superposition Spin States in an Atomic Ensemble

Details Generation of Superposition Spin States in an Atomic Ensemble Generation of Superposition Spin States in an Atomic Ensemble

2003-06-18

arxiv.org/abs/quant-ph/0306121v1

Physics

Quantum Physics

5 pages, 2 figures, accepted in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.060401

A method for generating a mesoscopic superposition state of the collective spin variable of a gas of atoms is proposed. The state consists of a superposition of the atomic spins pointing in two slightly different directions. It is obtained by using off resonant light to carry out Quantum Non Demolition Measurements of the spins. The relevant experimental conditions, which require very dense atomic samples, can be realized with presently available techniques. Long-lived atomic superposition states may become useful as an off-line resource for quantum computing with otherwise linear operations.

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