Ultra-broadband continuously-tunable polarization entangled photon pair source covering the C+L telecom bands based on a single type-II PPKTP crystal

Abstract

In this work, we report on the preparation of an ultra-broadband continuously-tunable, highly polarization-entangled photon-pair source covering the C+L telecom bands using a single type-II phase-matched bulk PPKTP crystal. Over 60 nm turning band of the down-converted photons is achieved experimentally. The broad tuning ability is due to operating near an extended phase match point in this crystal. The S parameter value of CHSH inequality is in the range between 2.60+/-0.04 (minimum) and 2.72+/-0.07 (maximum), which clearly demonstrates the high entanglement of the source over the whole tunable range. This is the first realization of such a broadband tunable degenerate polarization entanglement pair source in the telecom band. Combined with dense wavelength-division multiplexing technique, our source could be used to improve the transmission capacity of a single communication channel in the field of quantum communication.

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Cited by in corpus (8)

• Entangled Photon-Pair Sources based on three-wave mixing in bulk crystals
• CW-pumped telecom band polarization entangled photon pair generation in a Sagnac interferometer
• Theoretical investigation of a spectrally pure-state generation from isomorphs of KDP crystal at near-infrared and telecom wavelengths
• Efficient detection of a highly bright photon source using superconducting nanowire single photon detectors
• Actively switchable non-degenerate polarization entangled photon pair distribution in a dense wave-division multiplexing
• Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O${}_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystals
• Thermal effects of the quantum states generated from the isomorphs of PPKTP crystal
• Orbital angular momentum photonic quantum interface