Single-photon correlations for secure communication
2006 (English)In: Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components Architectures for Microwave Systems and Displays / [ed] Sjoqvist, LJ; Wilson, RA; Merlet, TJ, BELLINGHAM, WA: SPIE-INT SOC OPTICAL ENGINEERING , 2006, Vol. 6399, U124-U132 p.Conference paper (Refereed)
We present two types of photon sources designed for secure quantum communication, e.g. for quantum cryptog raphy. Both types are based on the creation of photon pairs by spontaneous parametric downconversion in nonlinear crystals. The first is a heralded single photon source and the second is a source of polarization-entangled photon pairs. For the heralded single photon source the detection of one of the photons of a downconversion pair is used as a trigger to announce the presence of the other: the single photon. The source is characterized by a highly sub-Poisson photon number statistics making it very suitable for use in quantum cryptography protocols using single photonic qubits to create correlated information between a sender and a receiver. The entanglement source instead uses the inherent non-classical correlations between entangled qubits. We also present a hybrid-encoding where the sender uses polarization to encode information while the receiver uses time-bins. Both sources create photons with highly non-degenerate wavelengths of 810 nm and 1550 nm, taking advantage of the efficient detectors at near-infrared and the low transmission loss of optical fibers at telecommunication wavelengths.
Place, publisher, year, edition, pages
BELLINGHAM, WA: SPIE-INT SOC OPTICAL ENGINEERING , 2006. Vol. 6399, U124-U132 p.
, PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE), ISSN 0277-786X ; 6399
quantum information, quantum cryptography, single photon sources, entanglement
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-42097DOI: 10.1117/12.689780ISI: 000243904800013ScopusID: 2-s2.0-33846202525ISBN: 978-0-8194-6497-2OAI: oai:DiVA.org:kth-42097DiVA: diva2:446481
Conference on Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Component/Architectures for Microwave Systems and Displays. Stockholm, SWEDEN. SEP 12-13, 2006
QC 201110072011-10-072011-10-052011-10-07Bibliographically approved