Macroscopic quantum state analyzed particle by particle

Macroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use discrete quantum tomography to reconstruct the joint quantum state of photon pairs...

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Bibliographic Details
Published in:Physical review letters 2015-03, Vol.114 (12), p.120402-120402, Article 120402
Main Authors: Beduini, Federica A, Zielińska, Joanna A, Lucivero, Vito G, de Icaza Astiz, Yannick A, Mitchell, Morgan W
Format: Article
Language:English
Subjects:
Bose-Einstein condensates
Coherence
Compressing
Entanglement
Photons
Quantum phenomena
Superconductivity
Tomography
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Summary:Macroscopic quantum phenomena, e.g., superconductivity and squeezing, are believed to result from entanglement of macroscopic numbers of particles. We report the first direct study of this kind of entanglement: we use discrete quantum tomography to reconstruct the joint quantum state of photon pairs extracted from polarization-squeezed light. Our observations confirm several predictions from spin-squeezing theory [Beduini et al., Phys. Rev. Lett. 111, 143601 (2013)], including strong entanglement and entanglement of all photon pairs within the squeezing coherence time. This photon-by-photon analysis may give insight into other macroscopic many-body systems, e.g., photon Bose-Einstein condensates.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.120402