## Time-bin entangled photon pairs from spontaneous parametric down-conversion pumped by a cw multi-mode diode laser |

Optics Express, Vol. 21, Issue 21, pp. 25492-25500 (2013)

http://dx.doi.org/10.1364/OE.21.025492

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### Abstract

Generation of time-bin entangled photon pairs requires the use of the Franson interferometer which consists of two spatially separated unbalanced Mach-Zehnder interferometers through which the signal and idler photons from spontaneous parametric down-conversion (SPDC) are made to transmit individually. There have been two SPDC pumping regimes where the scheme works: the narrowband regime and the double-pulse regime. In the narrowband regime, the SPDC process is pumped by a narrowband cw laser with the coherence length much longer than the path length difference of the Franson interferometer. In the double-pulse regime, the longitudinal separation between the pulse pair is made equal to the path length difference of the Franson interferometer. In this paper, we propose another regime by which the generation of time-bin entanglement is possible and demonstrate the scheme experimentally. In our scheme, differently from the previous approaches, the SPDC process is pumped by a cw multi-mode (i.e., short coherence length) laser and makes use of the coherence revival property of such a laser. The high-visibility two-photon Franson interference demonstrates clearly that high-quality time-bin entanglement source can be developed using inexpensive cw multi-mode diode lasers for various quantum communication applications.

© 2013 OSA

**OCIS Codes**

(270.5570) Quantum optics : Quantum detectors

(270.5565) Quantum optics : Quantum communications

(270.5585) Quantum optics : Quantum information and processing

**ToC Category:**

Quantum Optics

**History**

Original Manuscript: September 4, 2013

Revised Manuscript: October 6, 2013

Manuscript Accepted: October 9, 2013

Published: October 17, 2013

**Citation**

Osung Kwon, Kwang-Kyoon Park, Young-Sik Ra, Yong-Su Kim, and Yoon-Ho Kim, "Time-bin entangled photon pairs from spontaneous parametric down-conversion pumped by a cw multi-mode diode laser," Opt. Express **21**, 25492-25500 (2013)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-21-25492

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