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Lectures on Quantum Optics and Quantum Information

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Interlude: CV for Atomic Ensembles<br />

N 2-level atoms<br />

N fictitious 1/2 spins described<br />

by a collective spin<br />

Some atomic states…<br />

Collective spin operators<br />

Individual spins aligned al<strong>on</strong>g Oz<br />

Heisenberg inequality<br />

Uncorrelated spins Correlated spins<br />

Spin coherent state Spin squeezed state

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