A wavelength-tunable fiber-coupled source of narrowband entangled photons

Fedrizzi, Alessandro, Herbst, Thomas, Poppe, Andreas, Jennewein, Thomas and Zeilinger , Anton (2007) A wavelength-tunable fiber-coupled source of narrowband entangled photons. Optics Express, 15 23: 15377-15386.


Author Fedrizzi, Alessandro
Herbst, Thomas
Poppe, Andreas
Jennewein, Thomas
Zeilinger , Anton
Title A wavelength-tunable fiber-coupled source of narrowband entangled photons
Journal name Optics Express   Check publisher's open access policy
ISSN 1094-4087
Publication date 2007-11-05
Year available 2007
Sub-type Article (original research)
DOI 10.1364/OE.15.015377
Volume 15
Issue 23
Start page 15377
End page 15386
Total pages 10
Place of publication [Washington, U.S.
Publisher Optical Society of America
Language eng
Subject 01 Mathematical Sciences
0105 Mathematical Physics
Abstract We demonstrate a wavelength-tunable, fiber-coupled source of polarization- entangled photons with extremely high spectral brightness and quality of entanglement. Using a 25 mm PPKTP crystal inside a polarization Sagnac interferometer we detect a spectral brightness of 273000 pairs (s mW nm)−1, a factor of 28 better than comparable previous sources while state tomography showed the two-photon state to have a tangle of T = 0.987. This improvement was achieved by use of a long crystal, careful selection of focusing parameters and single-mode fiber coupling. We demonstrate that, due to the particular geometry of the setup, the signal and idler wavelengths can be tuned over a wide range without loss of entanglement.
Keyword Wavelength
Tunable
Fiber-coupled
polarized
Photons
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mathematics and Physics
 
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