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Generating a Superposition of Spin States in an Atomic Ensemble

par Massar, Serge ;Polzik, E. S.
Référence Physical Review Letters, 91, 6, page (060401)
Publication Publié, 2003

Article révisé par les pairs

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Résumé :

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 nondemolition 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.