Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission

Abstract

We present results of a bright polarization-entangled photon source operating at 1552 nm via type-II collinear degenerate spontaneous parametric down-conversion in a periodically poled potassium titanyl phosphate crystal. We report a conservative inferred pair generation rate of 123,000 pairs/s/mW into collection modes. Minimization of spectral and spatial entanglement was achieved by group velocity matching the pump, signal and idler modes and through properly focusing the pump beam. By utilizing a pair of calcite beam displacers, we are able to overlap photons from adjacent down-conversion processes to obtain polarization-entanglement visibility of 94.7 +/- 1.1% with accidentals subtracted.

4 pages, 7 color figures. Revised manuscript includes the following changes: corrected pair generation rate from 44,000/s/mW pump to 123,000/s/mW pump; replaced Fig. 1b to enhance clarity; minor alterations to the title, abstract and introduction; grammatical corrections

References in corpus (6)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• Tailored photon-pair generation in optical fibers
• Optimal Co-linear Gaussian Beams for Spontaneous Parametric Down-Conversion
• Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources
• A pulsed Sagnac source of narrowband polarization-entangled photons

Cited by in corpus (13)

• Widely tunable single photon source with high purity at telecom wavelength
• Quantum secret sharing with polarization-entangled photon pairs
• Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths
• Extended Wiener-Khinchin theorem for quantum spectral analysis
• Heralded generation of high-purity ultrashort single photons in programmable temporal shapes
• Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate tunable comb laser
• Detection-dependent six-photon NOON state interference
• 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
• Optimization of periodic single-photon sources based on combined multiplexing
• Heralding pure single photons: a comparision between counter-propagating and co-propagating twin photons
• Self-calibrating Fiber Spectrometer for the Measurement of Broadband Downconverted Photon Pairs
• Arbitrary Multi-Qubit Generation