Experimental Demonstration of Macroscopic Quantum Coherence in Gaussian States

Details Experimental Demonstration of Macroscopic Quantum Coherence in Gaussian States Experimental Demonstration of Macroscopic Quantum Coherence in Gaussian States

2007-02-23

arxiv.org/abs/quant-ph/0702215v1

Phys. Rev. A, 76 (3), 030101 (2007)

Physics

Quantum Physics

5 pages, 6 figures

Scientific paper

10.1103/PhysRevA.76.030101

We witness experimentally the presence of macroscopic coherence in Gaussian quantum states using a recently proposed criterion (E.G. Cavalcanti and M. Reid, Phys. Rev. Lett. 97, 170405 (2006)). The macroscopic coherence stems from interference between macroscopically distinct states in phase space and we prove experimentally that even the vacuum state contains these features with a distance in phase space of $0.51\pm0.02$ shot noise units (SNU). For squeezed states we found macroscopic superpositions with a distance of up to $0.83\pm0.02$ SNU. The proof of macroscopic quantum coherence was investigated with respect to squeezing and purity of the states.

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