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196 papers · 1 filter
Linearity of quantum probability measure and Hardy's model
Kazuo Fujikawa, C. H. Oh, Chengjie Zhang
We re-examine d=4 hidden-variables-models for a system of two spin- particles in view of the concrete model of Hardy, who analyzed the criterion of entanglement without referr…
Optimal decoy intensity for decoy quantum key distribution
Masahito Hayashi
In the decoy quantum key distribution, we show that a smaller decoy intensity gives a better key generation rate in the asymptotic setting when we employ only one decoy intensity a…
One-step achievement of robust multipartite Greenberger-Horne-Zeilinger state and controlled-phase gate via Rydberg interaction
Xiao-Qiang Shao, Tai-Yu Zheng, C. H. Oh +1
We present a proposal for generation of a robust tripartite Greenberger-Horne-Zeilinger state among three-individual neutral Rydberg atoms. By modulating the relation between two-p…
Witnessing quantum coherence in the presence of noise
Alex Monras, Agata Chȩcińska, Artur Ekert
We address the problem of assessing the coherent character of physical evolution. We take the quantum Zeno effect (QZE) as a characteristic trait of quantum dynamics, and derive re…
Quantum simulation of bosonic-fermionic non-interacting particles in disordered systems via quantum walk
Francesco De Nicola, Linda Sansoni, Andrea Crespi +6
We report on the theoretical analysis of bosonic and fermionic non-interacting systems in a discrete two-particle quantum walk affected by different kinds of disorder. We considere…
When asymptotic LOCC offers no advantage over finite LOCC
Honghao Fu, Debbie Leung, Laura Mancinska
We consider bipartite LOCC, the class of operations implementable by local quantum operations and classical communication between two parties. Surprisingly, there are operations th…