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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/81165
- Criteria for generalized macroscopic and mesoscopic quantum coherence
- Cavalcanti, E. G.; Reid, M. D.
- We consider macroscopic, mesoscopic, and 'S -scopic' quantum superpositions of eigenstates of an observable and develop some signatures for their existence. We define the extent, or size S of a superposition, with respect to an observable x, as being the range of outcomes of x predicted by that superposition. Such superpositions are referred to as generalized S -scopic superpositions to distinguish them from the extreme superpositions that superpose only the two states that have a difference S in their prediction for the observable. We also consider generalized S -scopic superpositions of coherent states. We explore the constraints that are placed on the statistics if we suppose a system to be described by mixtures of superpositions that are restricted in size. In this way we arrive at experimental criteria that are sufficient to deduce the existence of a generalized S -scopic superposition. The signatures developed are useful where one is able to demonstrate a degree of squeezing. We also discuss how the signatures enable a new type of Einstein-Podolsky-Rosen gedanken experiment.
- Publication type
- Journal article
- Physical Review A: Atomic, Molecular, and Optical Physics, Vol. 77, no. 6 (2008), article no. 062108
- Publication year
- FOR Code(s)
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0204 Condensed Matter Physics; 0205 Optical Physics
- Coherent light; Coherent states; Computer networks; Eigenstates; Einstein Podolsky Rosen; EPR; Forecasting; Mesoscopic; Quantum coherences; Quantum superpositions; Quantum theory; Superconducting materials
- American Physical Society
- Publisher URL
- Copyright © 2008 The American Physical Society.
- Peer reviewed