scholarly journals Useful entanglement can be extracted from all nonseparable states

2008 ◽  
Vol 49 (2) ◽  
pp. 022102 ◽  
Author(s):  
Lluís Masanes
Keyword(s):  
Nonseparable States

Extended negativity measure for multipartite k-nonseparable states

2016 ◽  
Vol 14 (01) ◽  
pp. 1650001 ◽  
Author(s):  
Yinzhu Wang ◽  
Danxia Wang ◽  
Li Huang
Keyword(s):  
Lower Bound ◽  
Entanglement Measure ◽  
Basic Properties ◽  
Nonseparable States

In this paper, an extended negativity entanglement measure for multipartite k-nonseparable states with respect to k-partition was proposed. We show that this measure is well-defined, i.e. it satisfies some basic properties as an entanglement measure. In addition, we give a relation between this measure and k-ME concurrence, and obtain a lower bound of this measure.

Nonseparability of continuously measured quantum systems in the classical limit

2007 ◽  
Vol 85 (6) ◽  
pp. 633-640
Author(s):  
S Ghose ◽  
B C Sanders ◽  
P M Alsing ◽  
I H Deutsch
Keyword(s):  
Quantum System ◽  
Classical Limit ◽  
Quantum Systems ◽  
Classical Dynamics ◽  
Nonclassical States ◽  
Classical Transition ◽  
Measured System ◽  
Nonseparable States ◽  
03.65 Ud ◽  
03.67 Mn

We analyze the question of separability in a continuously measured quantum system as it approaches the classical limit. We show that the record of position measurements can approach the classical limit even when the system is described by highly nonseparable states. In particular, in systems with a chaotic classical limit, chaos can work to enhance the entanglement in the system in the classical regime. This coexistence of nonclassical states and classical dynamics can be understood by analyzing the conditioned evolution of the measured system and the conditions for the quantum-to-classical transition. PACS Nos.: 03.65.Ta, 03.65.Ud, 03.67.Mn, 05.45.Mt, 03.67.–a

scholarly journals Exponentially Complex “Classically Entangled” States in Arrays of One-Dimensional Nonlinear Elastic Waveguides

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3553 ◽  
Author(s):  
Deymier ◽  
Runge ◽  
Hasan ◽  
Calderin
Keyword(s):  
Hilbert Space ◽  
Elastic System ◽  
Multiple Time ◽  
One Dimensional ◽  
Wave Guides ◽  
External Driver ◽  
Scale Perturbation ◽  
Nonlinear Elastic ◽  
Exponential Complexity ◽  
Nonseparable States

We demonstrate theoretically, using multiple-time-scale perturbation theory, the existence of nonseparable superpositions of elastic waves in an externally driven elastic system composed of three one-dimensional elastic wave guides coupled via nonlinear forces. The nonseparable states span a Hilbert space with exponential complexity. The amplitudes appearing in the nonseparable superposition of elastic states are complex quantities dependent on the frequency of the external driver. By tuning these complex amplitudes, we can navigate the state’s Hilbert space. This nonlinear elastic system is analogous to a two-partite two-level quantum system.

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