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Quantum 2.0 Conference and Exhibition

Engineering Spatial Entanglement of Photon Pairs Generated from Parametric Down-Conversion

So-Young Baek, Fumihiro Kaneda, Yasuyoshi Mitsumori, Keiichi Edamatsu

Published Jan 1, 2023• 0 citations
Publisher

Abstract

We present our recent progress on developing a parametric down-conversion source producing highly entangled photons in spatial mode toward quantum-enhanced spa-tial measurements. The degree of transverse spatial entanglement is engineered and characterized.
DOI
10.1364/quantum.2023.qw2a.38

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By making use of the spatial shape of paired photons, parametric down-conversion allows the generation of two-photon entanglement in a multidimensional Hilbert space. How much entanglement can be generated in this way? In principle, the infinite-dimensional nature of the spatial degree of freedom renders unbounded the amount of entanglement available. However, in practice, the specific configuration used, namely, its geometry, the length of the nonlinear crystal, and the size of the pump beam, can severely limit the value that could be achieved. Here we show that the use of quasi-phase-matching engineering allows one to increase the amount of entanglement generated, reaching values of tens of ebits of entropy of entanglement under different conditions. Our work thus opens a way to fulfill the promise of generating massive spatial entanglement under a diverse variety of circumstances, some more favorable for its experimental implementation.