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Optics Communications

Simple, pulsed, polarization entangled photon pair source

N. Bruno, Emmanuel Zambrini Cruzeiro, Anthony Martin, Rob Thew

Published Feb 15, 2014• 9 citations
Publisher
DOI
10.1016/j.optcom.2014.02.024

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Photonic quantum information experiments demand bright and highly entangled photon pair sources. The combination of periodic poling and collinear excitation geometry allows the use of considerably longer crystals for parametric down-conversion. We demonstrate a picosecond-pulsed laser pumped source of high quality polarization entangled photon pairs. The phase of the output biphoton state is affected by the relative phase of the two-color interferometer and the phase of the nonlinearly interacting Gaussian beams. We measure the influence of these onto the phase of the output state. The presented source is a promising candidate for a compact, semiconductor laser driven source of entangled photon pairs.
We propose integrated photonic sources based on spontaneous four-wave mixing (SFWM) in dispersion engineered silicon nitride (SiN) nanowaveguides capable of generating spectrally-pure polarization-entangled photon-pairs bridging the visible-NIR and telecom bands. A simple silica-clad SiN waveguide design with height 640 nm and width in the range 860–960 nm can generate polarization-entangled photon pairs that simultaneously offers high heralded single photon purity of$>9999% and concurrence upto 0.99, with signal and idler lying in the range99\sim736–740nmand736–740 nm and736–740nmand\sim1460–1560nm,respectively,employingapulsedpump(BW1460–1560 nm, respectively, employing a pulsed pump (BW1460–1560nm,respectively,employingapulsedpump(BW\gtrsim0.25–3THz)ofwavelengthnear0.25–3 THz) of wavelength near0.25–3THz)ofwavelengthnear\sim1−1-1−\mum.Slightlydifferentwaveguideheightof620nmandcorrespondingwaveguidewidthsintherange1040–1180nm,offeringthesamepurityandconcurrencestandards,canalsoaddressvariousquantummemoriesdemonstratedatthevisible−NIRwavelengthsofm. Slightly different waveguide height of 620 nm and corresponding waveguide widths in the range 1040–1180 nm, offering the same purity and concurrence standards, can also address various quantum memories demonstrated at the visible-NIR wavelengths ofm.Slightlydifferentwaveguideheightof620nmandcorrespondingwaveguidewidthsintherange1040–1180nm,offeringthesamepurityandconcurrencestandards,canalsoaddressvariousquantummemoriesdemonstratedatthevisible−NIRwavelengthsof\sim$775–800 nm with a telecom band interface. Such CMOS-compatible on-chip sources of spectrally-pure polarization-entangled photon pairs can potentially be employed in a scalable manner for various optical quantum technologies.