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Authority-based user authentication in quantum key distribution
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
KTH, Superseded Departments, Electronics.
2000 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 62, no 2, 022305- p.Article in journal (Refereed) Published
Abstract [en]

 We propose secure protocols for user authenticated quantum key distribution on jammable public channels between two parties, Alice and Bob. Via an arbitrator, Trent, these protocols provide data integrity and mutual identification of the messenger and recipient. The first three are based on single-photon generation and detection. The first and second require (initially) an unjammable channel between the arbitrator and each party. The third requires one broadcast from the arbitrator, disclosing what type of deterministic modification of the states sent through the quantum channel was done by him. The fourth and fifth protocols are based on two-particle entanglement with a preselection of nonorthogonal superpositions of Bell states. These two protocols also require one broadcast from the arbitrator disclosing the type of entangled state in each sending.

Place, publisher, year, edition, pages
2000. Vol. 62, no 2, 022305- p.
Keyword [en]
Communication channels (information theory), Cryptography, Data privacy, Network protocols, Photons, Security of data
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-9067DOI: 10.1103/PhysRevA.62.022305ISI: 000088683400030OAI: oai:DiVA.org:kth-9067DiVA: diva2:14621
Note
QC 20100831Available from: 2006-02-10 Created: 2006-02-10 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Entanglement in quantum communication: preparation and characterization of photonic qubits
Open this publication in new window or tab >>Entanglement in quantum communication: preparation and characterization of photonic qubits
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

At the heart of quantum physics lies the principle of superposition, and at the heart of information theory lies the bit. Perhaps the most useful property of quantum systems is that they can be loaded with information bits, so-called qubits, that are indefinitely both 0 and 1 until a measurement is made. Another consequence is that several qubits can become entangled, which is manifested by the non-classical correlations between such quantum systems when measured in all possible bases. Within the rapidly progressing fields of quantum information and quantum communication these quantum effects are utilized to perform tasks such as quantum computing and quantum cryptography.

In this thesis we present experimental and theoretical work using single photon sources to prepare ``flying'' photonic qubits. We describe work using mainly quasi-phase-matched nonlinear crystals to generate beams of entangled photon pairs, that are either encoded in polarization at near-visible wavelengths, or in time at optical fiber telecommunication wavelengths (1550 nm). The optical fiber is the medium used for transporting the qubits over a long distance, and it is therefore essential to couple the photons well into the fibers. By focusing the beams optimally, we have investigated how this problem can meet the requirement of creating photons of a narrow frequency bandwidth and a high photon flux. Furthermore, we have generated truly single photons that are heralded by an electrical signal. As a result of modifying the statistics of such sources we have been able to show the effect of photon antibunching. In two separate works, we have implemented a quantum key distribution system based on faint laser pulses at the telecom wavelength of 1550 nm, as well as protocols based on entanglement for performing authentication of key distribution in quantum cryptography.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xv, 93 p.
Series
Trita-MVT, ISSN 0348-4467 ; 2006:1
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-616 (URN)91-7178-254-0 (ISBN)
Public defence
2006-02-23, Sal C1, Electrum, Isafjordsgatan 20-26, Kista, 10:00
Opponent
Supervisors
Note
QC 20100909Available from: 2006-02-10 Created: 2006-02-10 Last updated: 2010-09-09Bibliographically approved

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