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

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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. (C) 2013 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2013-10
Language
English
Article Type
Article
Keywords

QUANTUM TELEPORTATION; BELL-INEQUALITY; HIGH-VISIBILITY; ENERGY; INTERFERENCE; STATE; VIOLATION

Citation

OPTICS EXPRESS, v.21, no.21, pp.25492 - 25500

ISSN
1094-4087
DOI
10.1364/OE.21.025492
URI
http://hdl.handle.net/10203/247190
Appears in Collection
PH-Journal Papers(저널논문)
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