Robert W Cherng and Eugene Demler 2007 New J. Phys. 9 7 doi:10.1088/1367-2630/9/1/007
Quantum noise analysis of spin systems realized with cold atoms
Focus on Cold Atoms in Optical LatticesRobert W Cherng and Eugene Demler
Show affiliationsPart of Focus on Cold Atoms in Optical Lattices
We consider the use of quantum noise to characterize many-body states of spin systems realized with ultracold atomic systems. These systems offer a wealth of experimental techniques for realizing strongly interacting many-body states in a regime with a large but not macroscopic number of atoms. In this regime, fluctuations of an observable such as the magnetization are discernible compared to the mean value. The full distribution function is experimentally relevant and encodes high order correlation functions that may distinguish various many-body states. We apply quantum noise analysis to the Ising model in a transverse field and find a distinctive even versus odd splitting in the distribution function for the transverse magnetization that distinguishes between the ordered, critical, and disordered phases. We also discuss experimental issues relevant for applying quantum noise analysis for general spin systems and the specific results obtained for the Ising model.
- PACS
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42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
75.10.Hk Classical spin models
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
- Subjects
- Dates
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Issue 1 (January 2007)
Received 29 September 2006
Published 18 January 2007
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Quantum noise analysis of spin systems realized with cold atoms
Robert W Cherng and Eugene Demler 2007 New J. Phys. 9 7
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