Entangled state generation with an intrinsically pure single-photon source and a weak coherent source

Abstract

We report on the experimental generation of an entangled state with a spectrally pure heralded single-photon state and a weak coherent state. By choosing group-velocity matching in the nonlinear crystal, our system for producing entangled photons was 60 times brighter than that in the earlier experiment [Phys. Rev. Lett. 90, 240401 (2003)], with no need of bandpass filters. This entanglement system is useful for quantum information protocols that require indistinguishable photons from independent sources.

7 pages, 5 figures

References in corpus (8)

• Multi-photon entanglement and interferometry
• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Experimental demonstration of Shor's algorithm with quantum entanglement
• Experimental interference of independent photons
• Efficient single-spatial-mode periodically-poled KTiOPO_4 waveguide source for high-dimensional entanglement-based quantum key distribution
• Multi-qubit entanglement engineering via projective measurements
• High-visibility nonclassical interference between pure heralded single photons and weak coherent photons
• Interference contrast in multi-source few photon optics

Cited by in corpus (7)

• Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
• CW-pumped telecom band polarization entangled photon pair generation in a Sagnac interferometer
• Quantum interferometers: principles and applications
• Theoretical investigation of a spectrally pure-state generation from isomorphs of KDP crystal at near-infrared and telecom wavelengths
• Efficient detection of a highly bright photon source using superconducting nanowire single photon detectors
• 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'