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Title: Nonclassicality Criteria in Multiport Interferometry
Authors: Kim, M. S.
Rigovacca, L.
Metcalf, B. J.
Walmsley, I. A.
Di Franco, Carmelo
Keywords: Nonclassicality
Issue Date: 2016
Source: Rigovacca, L., Di Franco, C., Metcalf, B. J., Walmsley, I. A., & Kim, M. S. (2016). Nonclassicality Criteria in Multiport Interferometry. Physical Review Letters, 117(21), 213602-.
Series/Report no.: Physical Review Letters
Abstract: Interference lies at the heart of the behavior of classical and quantum light. It is thus crucial to understand the boundaries between which interference patterns can be explained by a classical electromagnetic description of light and which, on the other hand, can only be understood with a proper quantum mechanical approach. While the case of two-mode interference has received a lot of attention, the multimode case has not yet been fully explored. Here we study a general scenario of intensity interferometry: we derive a bound on the average correlations between pairs of output intensities for the classical wavelike model of light, and we show how it can be violated in a quantum framework. As a consequence, this violation acts as a nonclassicality witness, able to detect the presence of sources with sub-Poissonian photon-number statistics. We also develop a criterion that can certify the impossibility of dividing a given interferometer into two independent subblocks.
ISSN: 0031-9007
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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