Demonstration of spectral correlation control in a source of polarization entangled photon pairs at telecom wavelength

Abstract

Spectrally correlated photon pairs can be used to improve performance of long range fiber based quantum communication protocols. We present a source based on spontaneous parametric down-conversion producing polarization entangled photons without spectral filtering. In addition, the spectral correlation within the photon pair can be controlled by changing the pump pulse duration or coupled spatial modes characteristics. The spectral and polarization correlations were characterized. The generated photon pairs feature both positive spectral correlations, no correlations, or negative correlations and polarization entanglement with the fidelity as high as 0.97 (no background subtraction) with the expected Bell state.

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• Interference effects in quantum-optical coherence tomography using spectrally engineered photon pairs
• Spectrally engineering photonic entanglement with a time lens
• A single photon detection system for visible and infrared spectrum range
• Reducing detection noise of a photon pair in a dispersive medium by controlling its spectral entanglement
• 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
• Optimal photon pairs for quantum communication protocols
• Remote temporal wavepacket narrowing
• Quantum communication improved by spectral entanglement and supplementary chromatic dispersion
• Optimizing QKD efficiency by addressing chromatic dispersion and time measurement uncertainty
• Advantages and limitations of channel multiplexing for discrete-variable quantum key distribution