Temporal coherence and correlation of counterpropagating twin photons

Abstract

This work analyses the temporal coherence and correlation of counterpropagating twin photons generated in a quasi-phase matched nonlinear cristal by spontaneous parametric-down conversion. We find out different pictures depending on the pump pulse duration relative to two characteristic temporal scales, determined respectively by the temporal separation between the counter-propagating and the co-propagating wavepackets. When the pump duration is intermediate between the two scales, we show a transition from a highly entangled state to an almost separable state, with strongly asymmetric spectral properties of the photons.

Submitted to Phys. Rev. A

References in corpus (4)

• Squeezing at a telecom wavelength, a compact and fully guided-wave approach
• Pure single photon generation by type-I PDC with backward-wave amplification
• Engineering the Frequency Spectrum of Bright Squeezed Vacuum via Group Velocity Dispersion in an SU(1,1) Interferometer
• Critical behaviour of coherence and correlation of counterpropagating twin beams

Cited by in corpus (1)

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