Down-conversion source of positively spectrally correlated and decorrelated photon pairs at telecom wavelength

Abstract

The frequency correlation (or decorrelation) of photon pairs is of great importance in long-range quantum communications and photonic quantum computing. We experimentally characterize a spontaneous parametric down conversion (SPDC) source, based on a Beta-Barium Borate (BBO) crystal cut for type-II phase matching at 1550 nm which emits photons with the positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.

3 pages, 4 figures

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• Spectral Correlation Measurements at the Hong-Ou-Mandel Interference Dip
• Reducing detection noise of a photon pair in a dispersive medium by controlling its spectral entanglement
• Demonstration of spectral correlation control in a source of polarization entangled photon pairs at telecom wavelength
• Theoretical investigation of a spectrally pure-state generation from isomorphs of KDP crystal at near-infrared and telecom wavelengths
• Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O${}_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystals
• Spectrally uncorrelated biphotons generated from `the family of BBO crystal'
• Spectral correlation in down-converted photon pairs at telecom wavelength
• Remote temporal wavepacket narrowing
• Quantum communication improved by spectral entanglement and supplementary chromatic dispersion
• Optimization of two-photon absorption for three-level atom