Inline multiphoton quantum state tomography

Kai Wang; Sergey V. Suchkov; James G. Titchener; Alexander Szameit; Andrey A. Sukhorukov

doi:10.1117/12.2539146

30 December 2019 Inline multiphoton quantum state tomography

Kai Wang, Sergey V. Suchkov, James G. Titchener, Alexander Szameit, Andrey A. Sukhorukov

Proceedings Volume 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019; 1120011 (2019) https://doi.org/10.1117/12.2539146
Event: ANZCOP, 2019, Melbourne, Australia

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.

Citation Download Citation

Kai Wang, Sergey V. Suchkov, James G. Titchener, Alexander Szameit, and Andrey A. Sukhorukov "Inline multiphoton quantum state tomography", 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); https://doi.org/10.1117/12.2539146

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