scholarly journals Quantum Cryptography with Entangled Photons

2000 ◽  
Vol 84 (20) ◽  
pp. 4729-4732 ◽  
Author(s):  
Thomas Jennewein ◽  
Christoph Simon ◽  
Gregor Weihs ◽  
Harald Weinfurter ◽  
Anton Zeilinger
Keyword(s):  
Quantum Cryptography ◽  
Entangled Photons

Quantum cryptography: Theoretical protocols for quantum key distribution and tests of selected commercial QKD systems in commercial fiber networks

2016 ◽  
Vol 14 (02) ◽  
pp. 1630002
Author(s):  
Monika Jacak ◽  
Janusz Jacak ◽  
Piotr Jóźwiak ◽  
Ireneusz Jóźwiak
Keyword(s):  
Quantum Cryptography ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Current Status ◽  
Entangled Photons ◽  
Fiber Networks ◽  
System Improvement ◽  
Metropolitan Networks

The overview of the current status of quantum cryptography is given in regard to quantum key distribution (QKD) protocols, implemented both on nonentangled and entangled flying qubits. Two commercial R&D platforms of QKD systems are described (the Clavis II platform by idQuantique implemented on nonentangled photons and the EPR S405 Quelle platform by AIT based on entangled photons) and tested for feasibility of their usage in commercial TELECOM fiber metropolitan networks. The comparison of systems efficiency, stability and resistivity against noise and hacker attacks is given with some suggestion toward system improvement, along with assessment of two models of QKD.

Cryptanalysis of a Practical Quantum Key Distribution with Polarization-Entangled Photons

2005 ◽  
Vol 5 (3) ◽  
pp. 181-186
Author(s):  
Th. Beth ◽  
J. Muller-Quade ◽  
R. Steinwandt
Keyword(s):  
Quantum Cryptography ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Key Exchange ◽  
Authentication Scheme ◽  
Entangled Photons ◽  
Key Exchange Protocol

Recently, a quantum key exchange protocol has been described\cite{PFLM04}, which served as basis for securing an actual bank transaction by means of quantum cryptography \cite{ZVS04}. The authentication scheme used to this aim has been proposed by Peev et al. \cite{PML04}. Here we show, that this authentication is insecure in the sense that an attacker can provoke a situation where initiator and responder of a key exchange end up with different keys. Moreover, it may happen that an attacker can decrypt a part of the plaintext protected with the derived encryption key.

scholarly journals Quantum Cryptography Using Entangled Photons in Energy-Time Bell States

2000 ◽  
Vol 84 (20) ◽  
pp. 4737-4740 ◽  
Author(s):  
W. Tittel ◽  
J. Brendel ◽  
H. Zbinden ◽  
N. Gisin
Keyword(s):  
Quantum Cryptography ◽  
Bell States ◽  
Entangled Photons

scholarly journals PREPARATION OF ENTANGLED PAIRS OF PHOTONS IN BARIUM BETA BORATE CRYSTAL

2018 ◽  
pp. 50-57
Author(s):  
O. M. Marchenko ◽  
N. N. Litvinova ◽  
V. K. Prilipko
Keyword(s):  
Quantum Optics ◽  
Quantum Cryptography ◽  
Bell Inequality ◽  
Practical Importance ◽  
Experimental System ◽  
Point Of View ◽  
Entangled Photons ◽  
Borate Crystal ◽  
Parametric Scattering ◽  
Set Up

For the last two decades, the focus of scientific research in the field of information transmission and processing has been in such sections of quantum optics as quantum computing and quantum cryptography. These areas of optics rely on the discovery of a special type of radiation - beams with pairs of bound or entangled photons. The experimental work in Russia, devoted to the entangled photons is undeservedly little. Therefore, the proposed work is important from a methodical point of view. Moreover, the experiment is performed on domestic equipment, much cheaper than most foreign analogues. The described system can be used as a prototype for setting up educational demonstration and laboratory works. Therefore, the proposed work will be of interest to researchers and universities involved in quantum optics. As a result of the work done, the attempt to create a source of entangled photons based on a barium beta-borate crystal can be considered successful. It should be added that in a second type of crystal pairs of entangled photons arise not only with respect to directions (and frequencies), but also with respect to two orthogonal polarizations. A similar source makes it possible to set up experiments similar to the Einstein-Podolsky-Rosen thought experience in Bohm’s interpretation. Therefore, it is also suitable for testing the Bell inequality. The article considers the practical importance of the phenomenon of generation of entangled photons for the purposes of quantum cryptography, the phenomenon of spontaneous parametric scattering and the creation of a source of entangled pairs of photons based on it, the experimental system and the results of the experiment on generation of correlated photon pairs, tangled with respect to directions and frequencies, the result of the experiment on observing the correlation in the detection times of pairs of entangled photons.

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