Photon correlations and features of nonclassical optical fields in a squeezed vacuum state

R.V. Zakharov^†^a, b, O.V. Tikhonova^‡^a, b
^aLomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation
^bLomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation

We discuss the spatial and spectral properties of electromagnetic fields in a squeezed vacuum state and consider photon correlations in such fields. We concentrate on a bright squeezed vacuum with a large mean number of photons per mode and both spatial and frequency multimode structures. A theoretical approach based on the introduction of independent Schmidt modes and their photon operators is considered, which allows analytically correctly describing any characteristics of the squeezed field, including photon correlations, in good agreement with experiment. We present methods for controlling the mode content, degree of squeezing, and entanglement of photons of the generated squeezed light, including the scheme of a nonlinear interferometer; their advantages and applied prospects are analyzed. We discuss applied problems where squeezed nonclassical states are realized: the dispersion characteristics of media in the THz frequency range and high-precision detection of weak phase and angular perturbations based on correlations between photons.

Correspondence should be addressed to
Keywords: quantum optics, multiphoton squeezed states of light, nonclassical electromagnetic fields, photon correlations, Schmidt modes, photon entanglement, high-precision quantum measurements
PACS: 42.50.Dv, 42.65.Lm, 42.65.Yj (all)
DOI: 10.3367/UFNe.2022.04.039181
URL: https://ufn.ru/en/articles/2023/4/c/
Web of Science

001099929700002
Scopus

2-s2.0-85177081213
ADS NASA

2023PhyU...66..381Z
Citation: Zakharov R V, Tikhonova O V "Photon correlations and features of nonclassical optical fields in a squeezed vacuum state" Phys. Usp. 66 381–409 (2023)

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Received: 26th, August 2021, revised: 13th, April 2022, accepted: 15th, April 2022

Оригинал: Захаров Р В, Тихонова О В «Корреляции фотонов и свойства неклассических оптических полей в состоянии сжатого вакуума» УФН 193 406–436 (2023); DOI: 10.3367/UFNr.2022.04.039181

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