Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Compact source of polarization-entangled photon pairs

Open Access Open Access

Abstract

We present a compact source of polarization-entangled photon pairs at a wavelength of 805 nm using a violet single-mode laser diode as the pump source of type-II spontaneous parametric down-conversion. The source exhibits entanglement and pair-rate comparable to conventional systems utilizing large frame ion lasers thus significantly increases the practicality of novel quantum information or quantum metrology applications.

©2004 Optical Society of America

Full Article  |  PDF Article
More Like This
Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP

Matthew Pelton, Philip Marsden, Daniel Ljunggren, Maria Tengner, Anders Karlsson, Anna Fragemann, Carlota Canalias, and Fredrik Laurell
Opt. Express 12(15) 3573-3580 (2004)

Compact sources of polarization-entangled photons

Marco Fiorentino and Raymond G. Beausoleil
Opt. Express 16(24) 20149-20156 (2008)

Pulsed Sagnac source of polarization entangled photon pairs

Ana Predojević, Stephanie Grabher, and Gregor Weihs
Opt. Express 20(22) 25022-25029 (2012)

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (4)

Fig. 1.
Fig. 1. Schematic set-up of the source. The single-mode cw laser diode operating at 402.6 nm pumps a 2 mm thick BBO crystal and produces polarization-entangled photon pairs at 805.2 nm collected into single-mode fibres. For compensation of the walk-off, two additional BBO crystals preceded by a half-wave retarder are used.
Fig. 2.
Fig. 2. Single (oe-12-2-276-i001) and coincidence (oe-12-2-276-i002) count rates depending on the pump power measured right behind the violet laser diode.
Fig. 3.
Fig. 3. Spectral distributions of the down-converted light collected into single-mode fibres. Both photons of the pair have nearly the same wavelength with separation only 0.22 nm around the degeneracy wavelength of 805.2 nm. The least-square Gaussian fit (solid lines) to measured data points shows FWHMs of 6.03±0.14 nm (oe-12-2-276-i003) and 6.24±0.56 (oe-12-2-276-i004), respectively. The offset of 44000 counts is due to the dark counts of the Si APDs.
Fig. 4.
Fig. 4. Polarization correlations between photons of a pair measured in the H/V (oe-12-2-276-i005) and +45°/-45° (oe-12-2-276-i006) polarization basis. The visibilities obtained from a sin2 fit (solid lines) to the measured coincidence count rates are 98.3±0.1% and 94.3±0.2%, respectively.
Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved