Contractive Schroedinger cat states for a free mass

Details Contractive Schroedinger cat states for a free mass Contractive Schroedinger cat states for a free mass

2003-03-06

arxiv.org/abs/quant-ph/0303031v1

New Journal of Physics 5 (2003) 5.1-5.21

Physics

Quantum Physics

24 pages, 7 encapsulated eps color figures, REVTeX4 style. Published online in New Journal of Physics 5 (2003) 5.1-5.21. Highe

Scientific paper

10.1088/1367-2630/5/1/305

Contractive states for a free quantum particle were introduced by Yuen [Yuen H P 1983 Phys. Rev. Lett. 51, 719] in an attempt to evade the standard quantum limit for repeated position measurements. We show how appropriate families of two- and three component ``Schroedinger cat states'' are able to support non-trivial correlations between the position and momentum observables leading to contractive behavior. The existence of contractive Schroedinger cat states is suggestive of potential novel roles of non-classical states for precision measurement schemes.

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