scholarly journals Universal quantum mechanics

2008 ◽  
Vol 78 (8) ◽  
Author(s):  
Steven B. Giddings
Keyword(s):  
Quantum Mechanics ◽  
Universal Quantum

Indeterminacy

2020 ◽  
pp. 172-184
Author(s):  
Alastair Wilson
Keyword(s):  
Quantum Mechanics ◽  
Quantum State ◽  
Modal Realism ◽  
Many Worlds ◽  
Philosophical Literature ◽  
Universal Quantum ◽  
Quantum Indeterminacy

In Everettian quantum mechanics, the universal quantum state is fundamental, non-contingent, and wholly determinate. By contrast, the parallel worlds of diverging EQM, and the contingency constituted by self-location amongst those worlds, are emergent and partly indeterminate. In particular, it is indeterminate both how many worlds there are, and what microscopic qualitative features those worlds have. This chapter discusses various ways to understand indeterminacy in the Everettian multiverse, and argues that the indeterminacies of EQM present no obstacle to the analytic ambitions of quantum modal realism. Everettians can understand quantum indeterminacy using models of indeterminacy that are familiar from the philosophical literature on vagueness.

scholarly journals Optimization and Implementation of Efficient and Universal Quantum Key Distribution

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Da-jun Huang ◽  
Wen-zhe Zhong ◽  
Jin Zhong ◽  
Dong Jiang ◽  
Hao Wu
Keyword(s):  
Quantum Mechanics ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Bit Rate ◽  
Low Bit Rate ◽  
The Past ◽  
Optimized Protocol ◽  
Chaotic Cryptography ◽  
Middleware Technology ◽  
Universal Quantum

Since quantum key distribution (QKD) can provide proven unconditional security guaranteed by the fundamental laws of quantum mechanics, it has attracted increasing attention over the past three decades. Its low bit rate, however, cannot meet the requirements of modern applications. To solve this problem, recently, an efficient and universal QKD protocol based on chaotic cryptography and middleware technology was proposed, which efficiently increases the bit rate of the underlying QKD system. Nevertheless, we find that this protocol does not take the bit errors into account, and one error bit may lead to the failure of the protocol. In this paper, we give an optimized protocol and deploy it on a BB84 QKD platform. The experimental results show that the optimized version provides resistance to bit errors compared with the original version. And the statistical properties of the generated bits are fully assessed using different methods. The evaluation results prove that the proposed protocol can generate bits with outstanding properties.

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