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

Autor(en)

Alessandro Fedrizzi, Thomas Herbst, Andreas Poppe, Thomas Jennewein, Anton Zeilinger

Abstrakt

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. © 2007 Optical Society of America.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW)

Journal

Optics Express

Band

15

Seiten

15377-15386

Anzahl der Seiten

10

DOI

https://doi.org/10.1364/OE.15.015377

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/832b5e60-dd4d-4a90-84a8-4c1f2c93cc5d