Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons

Abstract

We investigate different strategies suitable to generate pure heralded single photons through spontaneous parametric down-conversion, comparing the counter-propagating geometry studied in [1] with more conventional co-propagating configurations which enhance the purity of the heralded photon state through the technique of group-velocity matching. Our analysis is based on the correlation of twin photons in the temporal domain,a non-standard approach that provides a physical view of the mechanisms that permit to eliminate the temporal entanglement of the state and to generate high-purity heralded photons. The Schmidt number associated to the temporal modes, which provides a more quantitative estimate of the purity, is then calculated. The efficiency of the various strategies and the individual properties of the heralded photons thereby generated are also compared.

arXiv comment21 pages, 7 figures

References in corpus (15)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Analysis and interpretation of high transverse entanglement in optical parametric down conversion
• Tailoring Single and Multiphoton Probabilities of a Single Photon On-Demand Source
• Probing multimode squeezing with correlation functions
• Entanglement quantification and purification in continuous variable systems
• Engineered optical nonlinearity for a quantum light source
• Optimal Co-linear Gaussian Beams for Spontaneous Parametric Down-Conversion
• Conditional preparation of single photons using parametric downconversion: A recipe for purity
• Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission
• Dimensionality of the spatio-temporal entanglement of PDC photon pairs
• Pure single photon generation by type-I PDC with backward-wave amplification
• Critical behaviour of coherence and correlation of counterpropagating twin beams
• Counter-propagating spontaneous four wave mixing: photon-pair factorability and ultra-narrowband single photon
• Squeezing and EPR correlation in the Mirrorless Optical Parametric Oscillator
• Temporal coherence and correlation of counterpropagating twin photons

Cited by in corpus (5)

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• Nonlinear Domain Engineering for Quantum Technologies
• Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Two-dimensional fluorescence spectroscopy with quantum entangled photons and time- and frequency-resolved two-photon coincidence detection
• On-Chip Generation of Co-Polarized and Spectrally Separable Photon Pairs