Experimental demonstration of macroscopic quantum coherence in Gaussian states
Marquardt C, Andersen UL, Leuchs G, Takeno Y, Yukawa M, Yonezawa H, Furusawa A (2007)
Publication Type: Journal article
Publication year: 2007
Journal
Publisher: American Physical Society
Book Volume: 76
Pages Range: 030101
DOI: 10.1103/PhysRevA.76.030101
Abstract
We witness experimentally the presence of macroscopic coherence in Gaussian quantum states using a recently proposed criterion. The macroscopic coherence stems from interference between macroscopically distinct states in phase space, and we prove experimentally that a coherent state contains these features with a distance in phase space of 0.51±0.02 shot noise units. This is surprising because coherent states are generally considered being at the border between classical and quantum states, not yet displaying any nonclassical effect. For squeezed and entangled states the effect may be larger but depends critically on the state purity. © 2007 The American Physical Society.
Authors with CRIS profile
Christoph Marquardt
Lehrstuhl für Experimentalphysik (Optik)
Gerhard Leuchs
Lehrstuhl für Experimentalphysik (Optik)
Involved external institutions
University of Tokyo
Japan (JP)
Technical University of Denmark / Danmarks Tekniske Universitet (DTU)
Denmark (DK)
Japan (JP)
Technical University of Denmark / Danmarks Tekniske Universitet (DTU)
Denmark (DK)
How to cite
APA:
Marquardt, C., Andersen, U.L., Leuchs, G., Takeno, Y., Yukawa, M., Yonezawa, H., & Furusawa, A. (2007). Experimental demonstration of macroscopic quantum coherence in Gaussian states. Physical Review A, 76, 030101. https://doi.org/10.1103/PhysRevA.76.030101
MLA:
Marquardt, Christoph, et al. "Experimental demonstration of macroscopic quantum coherence in Gaussian states." Physical Review A 76 (2007): 030101.
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