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Increasing the Visibility of Multiphoton Entanglement
Author(s) -
Paris Matteo G. A.
Publication year - 2000
Publication title -
fortschritte der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/(sici)1521-3978(200005)48:5/7<511::aid-prop511>3.0.co;2-7
Subject(s) - quantum entanglement , coincidence counting , homodyne detection , interferometry , visibility , physics , coincidence , photon , direct conversion receiver , photon entanglement , optics , quantum mechanics , photon counting , quantum metrology , quantum discord , quantum , medicine , alternative medicine , pathology
The entanglement between the two beams exiting a Mach‐Zehnder interferometer fed two squeezed states involves many photons. We evaluate the degree of this multiphoton entanglement in terms of the excess entropy of the pure state at the output. A novel kind of fourth‐order correlation function based on homodyne detection is suggested to reveal entanglement. Apart from the very low signals regime homodyne‐like detection shows a higher fringes visibility than the measurement of the coincidence counting rate.