Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)

Abstract

We theoretically investigated spectrally uncorrelated biphotons generated in a counter-propagating spontaneous parametric downconversion (CP-SPDC) from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As) crystals. By numerical calculation, it was found that the five crystals from the KTP family can be used to generate heralded single photons with high spectral purity and wide tunability. Under the type-0 phase-matching condition, the purity at 1550 nm was between 0.91 and 0.92, and the purity can be maintained over 0.90 from 1500 nm to 2000 nm wavelength. Under the type-II phase-matching condition, the purity at 1550 nm was 0.96, 0.97, 0.97, 0.98, and 0.98 for PPKTP, PPRTP, PPKTA, PPRTA, and PPCTA, respectively; furthermore, the purity can be kept over 0.96 for more than 600 nm wavelength range. We also simulated the Hong-Ou-Mandel interference between independent photon sources for PPRTP crystals at 1550 nm, and interference visibility was 92% (97%) under type-0 (type-II) phase-matching condition. This study may provide spectrally pure narrowband single-photon sources for quantum memories and quantum networks at telecom wavelengths.

7 pages, 4 figures

References in corpus (11)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Entangling Independent Photons by Time Measurement
• Quantum storage of entangled telecom-wavelength photons in an erbium-doped optical fibre
• Conditional preparation of single photons using parametric downconversion: A recipe for purity
• Widely tunable single photon source with high purity at telecom wavelength
• Pure single photon generation by type-I PDC with backward-wave amplification
• Counter-propagating photon pair generation in a nonlinear waveguide
• Numerical Investigation of Photon-Pair Generation in Periodically Poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O${}_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystals
• Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons
• Narrow-band photonic quantum entanglement with counterpropagating domain engineering

Cited by in corpus (1)

• Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation