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Macroscopic Quantum State Analyzed Particle by Particle
Beduini, Federica A.; Zielińska, Joanna A.; Lucivero, Vito G.; Icaza Astiz, Yannick A. de; Mitchell, Morgan W.
Universitat Politècnica de Catalunya. Institut de Ciències Fotòniques
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 spinsqueezing 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.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
Quantum theory
Quantum mechanics
Quàntums, Teoria dels
ACS Publications

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