Contractive Schrödinger cat states for a free mass
Open Access
- 17 January 2003
- journal article
- Published by IOP Publishing in New Journal of Physics
- Vol. 5 (1) , 5
- https://doi.org/10.1088/1367-2630/5/1/305
Abstract
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 `Schrödinger cat states' are able to support non-trivial correlations between the position and momentum observables leading to contractive behaviour. The existence of contractive Schrödinger cat states is suggestive of potential novel roles of non-classical states for precision measurement schemes.Keywords
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