Phys. Rev. Lett. 97, 170405 (2006) [4 pages]Signatures for Generalized Macroscopic SuperpositionsReceived 12 February 2006; published 26 October 2006 We develop criteria sufficient to enable detection of macroscopic coherence where there are not just two macroscopically distinct outcomes for a pointer measurement, but rather a spread of outcomes over a macroscopic range. The criteria provide a means to distinguish a macroscopic quantum description from a microscopic one based on mixtures of microscopic superpositions of pointer-measurement eigenstates. The criteria are applied to Gaussian-squeezed and spin-entangled states. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.170405
DOI:
10.1103/PhysRevLett.97.170405
PACS:
03.65.Ta, 03.65.Ud, 42.50.Dv, 42.50.Xa
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