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Inline multiphoton quantum state tomography
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Paper Abstract

Latest advances in integrated single-photon detectors offer possibilities for gaining information inside quantum photonic circuits. We introduce a concept and provide experimental evidence for the inline tomographic mea- surement of multiphoton quantum states, while keeping the transmitted ones undisturbed. We establish that by recording photon correlations from optimally positioned detectors on top of coupled waveguides with de- tuned propagation constants, one can perform robust reconstruction of multiphoton density matrices describing the amplitude, phase, coherence and quantum entanglement. We report proof-of-principle experiments. Our method opens a pathway towards practical and fast inline state tomography for diverse applications in quantum photonics.

Paper Details

Date Published: 30 December 2019
PDF: 2 pages
Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 1120011 (30 December 2019); doi: 10.1117/12.2539146
Show Author Affiliations
Kai Wang, The Australian National Univ. (Australia)
Univ. Rostock (Germany)
Sergey V. Suchkov, The Australian National Univ. (Australia)
James G. Titchener, The Australian National Univ. (Australia)
Univ. of Bristol (United Kingdom)
Alexander Szameit, Univ. Rostock (Germany)
Andrey A. Sukhorukov, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 11200:
AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019
Arnan Mitchell; Halina Rubinsztein-Dunlop, Editor(s)

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