Order-invariant two-photon quantum correlations in PT-symmetric interferometers
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929666358509568 |
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| author | Wolterink, Tom A. W. Heinrich, Matthias Scheel, Stefan Szameit, Alexander |
| author_facet | Wolterink, Tom A. W. Heinrich, Matthias Scheel, Stefan Szameit, Alexander |
| contents | Multiphoton correlations in linear photonic quantum networks are governed by matrix permanents. Yet, surprisingly few systematic properties of these crucial algebraic objects are known, while their calculation is a computationally hard task. As such, predicting the overall multiphoton behavior of a network from its individual building blocks typically defies intuition. In this work we identify sequences of concatenated two-mode linear optical transformations whose two-photon behavior is invariant under reversal of the order. We experimentally verify this systematic behavior in parity-time-symmetric complex interferometer arrangements of varying composition. Our results underline new ways in which quantum correlations may be preserved in counterintuitive ways even in small-scale non-Hermitian networks. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_11884 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Order-invariant two-photon quantum correlations in PT-symmetric interferometers Wolterink, Tom A. W. Heinrich, Matthias Scheel, Stefan Szameit, Alexander Quantum Physics Optics Multiphoton correlations in linear photonic quantum networks are governed by matrix permanents. Yet, surprisingly few systematic properties of these crucial algebraic objects are known, while their calculation is a computationally hard task. As such, predicting the overall multiphoton behavior of a network from its individual building blocks typically defies intuition. In this work we identify sequences of concatenated two-mode linear optical transformations whose two-photon behavior is invariant under reversal of the order. We experimentally verify this systematic behavior in parity-time-symmetric complex interferometer arrangements of varying composition. Our results underline new ways in which quantum correlations may be preserved in counterintuitive ways even in small-scale non-Hermitian networks. |
| title | Order-invariant two-photon quantum correlations in PT-symmetric interferometers |
| topic | Quantum Physics Optics |
| url | https://arxiv.org/abs/2302.11884 |