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Magnon Squeezing in an Antiferromagnet: Reducing the Spin Noise below the Standard Quantum Limit

by: Jimin Zhao, A. V. Bragas, D. J. Lockwood, R. Merlin
Physical Review Letters, Vol. 93 (Sep 2004), 107203, doi:10.1103/physrevlett.93.107203  Key: citeulike:11340397

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Abstract

We report the first experimental demonstration of quantum squeezing of a collective spin-wave excitation (magnon) using femtosecond optical pulses to generate correlations involving pairs of spins in an antiferromagnetic insulator MnF2. In the squeezed state, the fluctuations of the magnetization of a crystallographic unit cell vary periodically in time and are reduced below that of the ground-state quantum noise.


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