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A source of entangled photon-pairs: Optimizing emission in two quasi-phasematched crystals
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2004 (English)In: Quantum Communication, Measurement And Computing / [ed] Barnett, SM; Andersson, E; Jeffers, J; Ohberg, P; Hirota, O, 2004, Vol. 734, 354-357 p.Conference paper, Published paper (Refereed)
Abstract [en]

We extend our earlier results [1] of a bright source of non-degenerate polarization entangled photon-pairs by making a thorough theoretical and experimental investigation of its single-mode emission and state-decoherence. Using two perpendicular bulk crystals of periodically poled KTP, the source directly creates the polarization-entangled state (\HH> + \VV>)/root2 with signal and idler wavelengths of 810 nm and 1550 nm, respectively. In order to optimize the coupling into single-mode fiber we have developed a numerical algorithm which determines the emission mode and the fiber coupling efficiency for a given crystal length and focussing of the pump. For a 4.5 mm long crystal the optimal focussing of the pump is to a beam waist radius of 14 mum. With these focussing conditions the computer calculations give the lowest M-2 value for the emission mode, M-2 approximate to 3, and the best possible fiber coupling efficiency, gamma approximate to 75%. Using the theoretical results to optimize our experimental setup we obtained photon count rates of 1.4 MHz singles and 12 kHz coincidences, and visibilities H, V: 99.6% and 45degrees: 94.2%.

Place, publisher, year, edition, pages
2004. Vol. 734, 354-357 p.
Series
AIP Conference Proceedings, ISSN 0094-243X ; 734
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-44384ISI: 000226204400082ISBN: 0-7354-0216-7 (print)OAI: oai:DiVA.org:kth-44384DiVA: diva2:450575
Conference
7th International Conference on Quantum Communication, Measurement and Computing Location: Glasgow, Scotland, Date: JUL 25-29, 2004
Note
QC 20111021Available from: 2011-10-21 Created: 2011-10-20 Last updated: 2011-10-21Bibliographically approved

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  • apa
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