Phase-stable source of polarization-entangled photons in a linear double-pass configuration

Abstract

We demonstrate a compact, robust, and highly efficient source of polarization-entangled photons, based on linear bi-directional down-conversion in a novel 'folded sandwich' configuration. Bi-directionally pumping a single periodically poled KTiOPO${}_4$ (ppKTP) crystal with a 405-nm laser diode, we generate entangled photon pairs at the non-degenerate wavelengths 784 nm (signal) and 839 nm (idler), and achieve an unprecedented detection rate of 11.8 kcps for 10.4 $\mu$W of pump power (1.1 million pairs / mW), in a 2.9-nm bandwidth, while maintaining a very high two-photon entanglement quality, with a Bell-state fidelity of $99.3\pm 0.3$%.

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• Polarization-entangled photon-pair source obtained via type-II non-collinear SPDC process with PPKTP crystal
• Broadband pumped polarization entangled photon-pair source in a linear beam displacement interferometer
• Experimental entangled photon pair generation using crystals with parallel optical axes
• Experimentally optimizing QKD rates via nonlocal dispersion compensation
• On quantum interferometric measurements of temperature
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• Power-efficient production of photon pairs in a tapered chalcogenide microwire
• Experimental generation of polarization entanglement from spontaneous parametric down-conversion pumped by spatiotemporally highly incoherent light
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• A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures
• Deploying quantum light sources on nanosatellites I: lessons and perspectives on the optical system
• General and complete description of temporal photon correlations in cavity-enhanced spontaneous parametric down-conversion
• Enhancing the stimulated emission of polarization-entangled photons using passive optical components
• Compact and stable source of polarization-entangled photon-pairs based on a folded linear displacement interferometer
• Pulsed Sagnac source of polarization-entangled photon pairs in telecommunication band
• Generating entangled photon pairs in a parallel crystal geometry