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Proceedings Paper

All-dielectric metasurfaces for measuring multi-photon quantum-polarization states (Conference Presentation)

Paper Abstract

With recent advances in nanophotonics, metasurfaces based on nano-resonators have facilitated novel types of optical devices. In particular, the interplay between different degrees of freedom, involving polarization and spatial modes, boosted classical polarization measurements and imaging applications. However, the use of metasurfaces for measuring the quantum states of light remains largely unexplored. Conventionally, the task of quantum state tomography is realized with several bulk optical elements, which need to be reconfigured multiple times. Such setups can suffer from decoherence, and there is a fundamental and practical interest in developing integrated solutions for measurement of multi-photon quantum states. We present a new concept and the first experimental realization of all-dielectric metasurfaces with no tuneable elements for imaging-based reconstruction of the full quantum state of entangled photons. Most prominently, we implement multi-photon interferometric measurements on a sub-wavelength thin optical element, which delivers ultimate miniaturization and extremely high robustness. Specifically, we realize a highly transparent all-dielectric metasurface, which spatially splits different components of quantum-polarization states. Then, a simple one-shot measurement of correlations with polarization-insensitive on-off click detectors enables complete reconstruction of multi-photon density matrices with high precision. In our experiment, we prepare sets of polarization states and reconstruct their density matrices with a high fidelity of over 99% for single photon states and above 95% for two-photon states. Our work provides a fundamental advance in the imaging of quantum states, where multi-photon quantum interference takes place at sub-wavelength scale.

Paper Details

Date Published: 17 September 2018
Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 1071914 (17 September 2018); doi: 10.1117/12.2320424
Show Author Affiliations
Kai Wang, The Australian National Univ. (Australia)
James G. Titchener, The Australian National Univ. (Australia)
Sergey S. Kruk, The Australian National Univ. (Australia)
Lei Xu, The Australian National Univ. (Australia)
Hung-Pin Chung, The Australian National Univ. (Australia)
National Central Univ. (Taiwan)
Matthew Parry, The Australian National Univ. (Australia)
Ivan Kravchenko, Oak Ridge National Lab. (United States)
Yen-Hung Chen, National Central Univ. (Taiwan)
Alexander S. Solntsev, The Australian National Univ. (Australia)
Univ. of Technology, Sydney (Australia)
Yuri S. Kivshar, The Australian National Univ. (Australia)
Dragomir N. Neshev, The Australian National Univ. (Australia)
Andrey A. Sukhorukov, The Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 10719:
Metamaterials, Metadevices, and Metasystems 2018
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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