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Quantum Electronics and Laser Science Conference

A Robust Phase-Stable Broadband High Spectral Brightness Polarization-Entangled Fiber-Based Two-Photon Source

Jingyun Fan

Published May 6, 2007• 0 citations
OpenAlex

Abstract

We report making a broadband high spectral brightness polarization-entangled fiber-based two-photon source, with registered photon coincidence rate of 7 kHz, visibility greater than 97% and violation of classical limit by 37 σ at room temperature.

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Frontiers in Optics•Jan 1, 2006•2 citations
We describe an achromatic, phase-stable, broadband source of polarization-entangled photon pairs with high spectral brightness that uses four-wave mixing in a fiber Sagnac interferometer. We achieved a polarization-entangled two-photon coincidence rate of 7kHz7\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}7kHz per 0.5THz0.5\phantom{\rule{0.3em}{0ex}}\mathrm{THz}0.5THz (0.9nm)(0.9\phantom{\rule{0.3em}{0ex}}\mathrm{nm})(0.9nm) of bandwidth per $300\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}\mathrm{W}$ of average pump power. At this rate, we observed two-photon fringe interference visibilities greater than 97%, over a 10THz10\phantom{\rule{0.3em}{0ex}}\mathrm{THz}10THz $(\ensuremath{\approx}21\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ spectral range. We measured violations of Bell's inequality by more than 22 standard deviations for each of the four Bell states in less than 3minutes3\phantom{\rule{0.3em}{0ex}}\text{minutes}3minutes per state. The high spectral brightness $(26\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}\phantom{\rule{0.2em}{0ex}}{\mathrm{nm}}^{\ensuremath{-}1}\phantom{\rule{0.2em}{0ex}}{\mathrm{mW}}^{\ensuremath{-}1})$, large tunable wavelength range, single spatial mode, and phase stability make this source a promising candidate for a wide range of quantum-information applications.
We describe the preparation of a high spectral brightness, broad wavelength coverage, single-spatial mode source of polarization-entangled photon pairs operated at room temperature. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power (300 μW), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral range of more than 20 nm.
We describe the preparation of a high spectral brightness, broad wavelength coverage, single-spatial mode source of polarization-entangled photon pairs operated at room temperature. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power (300 μW), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral range of more than 20 nm.