Abstract

A source of entangled photons based on well-separated laser pump pulses (PDs) with a duration in the nanosecond range may be useful in many applications. Yet, such a source has intrinsic problems arising from the simultaneous arrival of signal and noise photons to the detectors, which makes the methods unsuitable for dealing with accidental (or spurious) coincidences applied in the continuous-wave or mode-locked pump regimes. Those problems are analyzed, and practical methods to calculate the number of accidental coincidences are described and experimentally checked. These methods are useful not only to measure entanglement, but also in every situation where extracting the number of valid two-photon coincidences from noisy data generated by such a pulsed process is required. As an original example of the use of these methods, we present the time-resolved measurement of the concurrence of the field produced by spontaneous parametric downconversion with PDs of duration in the ns range at a repetition of kHz.

© 2014 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Efficient and pure femtosecond-pulse-length source of polarization-entangled photons

Morgan M. Weston, Helen M. Chrzanowski, Sabine Wollmann, Allen Boston, Joseph Ho, Lynden K. Shalm, Varun B. Verma, Michael S. Allman, Sae Woo Nam, Raj B. Patel, Sergei Slussarenko, and Geoff J. Pryde
Opt. Express 24(10) 10869-10879 (2016)

Simple performance evaluation of pulsed spontaneous parametric down-conversion sources for quantum communications

Jean-Loup Smirr, Sylvain Guilbaud, Joe Ghalbouni, Robert Frey, Eleni Diamanti, Romain Alléaume, and Isabelle Zaquine
Opt. Express 19(2) 616-627 (2011)

Stable source of high quality telecom-band polarization-entangled photon-pairs based on a single, pulse-pumped, short PPLN waveguide

Han Chuen Lim, Akio Yoshizawa, Hidemi Tsuchida, and Kazuro Kikuchi
Opt. Express 16(17) 12460-12468 (2008)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (22)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription