scholarly journals Perspective—On the thermodynamics of perfect unconditional security

2021 ◽  
Vol 119 (1) ◽  
pp. 010501
Author(s):  
Christiana Chamon ◽  
Laszlo B. Kish
Keyword(s):  
Unconditional Security

scholarly journals Experimental demonstrations of unconditional security in a purely classical regime

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Byoung S. Ham
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Unconditional Security ◽  
Zehnder Interferometer ◽  
Experimental Demonstration ◽  
Orthogonal Bases ◽  
Unitary Transformations ◽  
Mach Zehnder Interferometer

AbstractSo far, unconditional security in key distribution processes has been confined to quantum key distribution (QKD) protocols based on the no-cloning theorem of nonorthogonal bases. Recently, a completely different approach, the unconditionally secured classical key distribution (USCKD), has been proposed for unconditional security in the purely classical regime. Unlike QKD, both classical channels and orthogonal bases are key ingredients in USCKD, where unconditional security is provided by deterministic randomness via path superposition-based reversible unitary transformations in a coupled Mach–Zehnder interferometer. Here, the first experimental demonstration of the USCKD protocol is presented.

QUANTUM PROXY GROUP SIGNATURE SCHEME WITH χ-TYPE ENTANGLED STATES

2012 ◽  
Vol 10 (04) ◽  
pp. 1250041 ◽  
Author(s):  
XUN-RU YIN ◽  
WEN-PING MA ◽  
WEI-YAN LIU
Keyword(s):  
Initial Phase ◽  
Proxy Signature ◽  
Quantum Signature ◽  
Unconditional Security ◽  
Group Signature ◽  
Entangled States ◽  
Utilization Rate ◽  
Signature Scheme ◽  
State Sequence ◽  
General Quantum

A quantum proxy group signature scheme is proposed with χ-type entangled states. Our scheme combines the properties of group signature and proxy signature. Moreover, the particles in the χ-type state sequence are used to distribute proxy warrants and quantum keys in the initial phase, and then used for quantum signature. Therefore it increases the utilization rate of quantum resources compared with the general quantum signature scheme. Finally, the unconditional security of our scheme is also analyzed.

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