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

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 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

Analytical description of photonic waveguides with multilayer claddings: Towards on-chip generation of entangled photons and Bell states

2013 ◽  
Vol 301-302 ◽  
pp. 127-140 ◽  
Author(s):  
Sergei V. Zhukovsky ◽  
Lukas G. Helt ◽  
Dongpeng Kang ◽  
Payam Abolghasem ◽  
Amr S. Helmy ◽  
...  
Keyword(s):  
Analytical Description ◽  
Bell States ◽  
Entangled Photons ◽  
Photonic Waveguides ◽  
On Chip

scholarly journals A paradigm shift in mathematical physics, Part 4: Quantum computers and the local realism of all 4 Bell states

2015 ◽  
Vol 11 (7) ◽  
pp. 5476-5493
Author(s):  
Jeffrey H. Boyd
Keyword(s):  
Quantum Information ◽  
Paradigm Shift ◽  
Mathematical Physics ◽  
Bell States ◽  
Local Realism ◽  
Quantum Computers ◽  
Entangled Photons ◽  
Shared History ◽  
Elementary Waves ◽  
New Generation

Can quantum information systems be understood using local realism? The consensus is No. Quantum information is based on qubits and Bell states. According to conventional wisdom these cannot be understood using local realism. Invariably local realism is assumed, incorrectly, to refer only to the Einstein, Podolsky and Rosen (EPR) model. Today a radically different model of local realism has arisen. The Theory of Elementary Waves (TEW) is incompatible with Einsteins picture of reality but nevertheless is local and realistic. We show that the Bell test experiments that invalidate EPR, validate TEW! This article uses TEW to reproduce all four Bell states. From TEW we derive the Bell states. We also show that TEW can explain an experiment using remote entangled photons that have no shared history, which are entangled because ofentanglement swapping. The implications of our study for quantum information theory are unclear, except that the term nonlocal should be replaced with a more precise and fruitful term. Nonlocal is vague and misleading. Elementary ray is a verifiable and precisely defined term that can replace it. This paradigm shift could inspire a new generation of quantum information experiments. 

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