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A single-crystal source of path-polarization entangled photons at non-degenerate wavelengths
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0003-2136-4914
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
2008 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 16, no 13, 9701-9707 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate a bright, narrowband, compact, quasi-phase-matched single-crystal source generating path-polarization-entangled photon pairs at 810 nm and 1550 nm at a maximum rate of 3 x 10(6) s(-1) THz(-1) mW(-1) after coupling to single-mode fiber, and with two-photon interference visibility above 90%. While the source can already be used to implement quantum communication protocols such as quantum key distribution, this work is also instrumental for narrowband applications such as entanglement transfer from photonic to atomic qubits, or entanglement of photons from independent sources.

Place, publisher, year, edition, pages
2008. Vol. 16, no 13, 9701-9707 p.
Keyword [en]
Photons, Polarization, 1550 nm, Entangled photon pairs, Narrow bands, Polarization-entangled photons, Quasi-phase-matched (QPM)
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-8638DOI: 10.1364/OE.16.009701ISI: 000257563900050Scopus ID: 2-s2.0-46149127578OAI: oai:DiVA.org:kth-8638DiVA: diva2:14013
Note
QC 20100914. Uppdaterad från submitted till published (20100914). Tidigare titel: A single-crystal source of phase-polarization entangled photons at non-degenerate wavelengthsAvailable from: 2008-06-04 Created: 2008-06-04 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Photonic Qubits for Quantum Communication: Exploiting photon-pair correlations; from theory to applications
Open this publication in new window or tab >>Photonic Qubits for Quantum Communication: Exploiting photon-pair correlations; from theory to applications
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

For any communication, the conveyed information must be carried by some physical system. If this system is a quantum system rather than a classical one, its behavior will be governed by the laws of quantum mechanics. Hence, the properties of quantum mechanics, such as superpositions and entanglement, are accessible, opening up new possibilities for transferring information. The exploration of these possibilities constitutes the field of quantum communication. The key ingredient in quantum communication is the qubit, a bit that can be in any superposition of 0 and 1, and that is carried by a quantum state. One possible physical realization of these quantum states is to use single photons. Hence, to explore the possibilities of optical quantum communication, photonic quantum states must be generated, transmitted, characterized, and detected with high precision. This thesis begins with the first of these steps: the implementation of single-photon sources generating photonic qubits. The sources are based on photon-pair generation in nonlinear crystals, and designed to be compatible with fiber optical communication systems. To ensure such a compatibility and to create a high-quality source, a theoretical analysis is made, optimizing the coupling of the photons into optical fibers. Based on the theoretical analysis, a heralded single-photon source and a two-crystal source of entangled photons-pairs are experimentally implemented. The source of entangled photons is further developed into a compact source with a narrow bandwidth compatible with standard telecommunication wavelength-division multiplexers, and even further developed to a more stable one-crystal source. The sources are to be used for quantum communication in general and quantum cryptography in particular. Specifically, a heralded single-photon source is implemented and then used for a full test of a decoy-state quantum cryptography protocol.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xii, 79 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2008:13
Keyword
quantum communication, photon-pair sources, entanglement
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4798 (URN)978-91-7415-005-6 (ISBN)
Public defence
2008-06-13, Sal D, Forum, KTH Kista, Isafjordsgatan 39, Kista, 10:00
Opponent
Supervisors
Note
QC 20100914Available from: 2008-06-04 Created: 2008-06-04 Last updated: 2010-09-14Bibliographically approved

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Swillo, Marcin

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