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- W3035705874 abstract "Distribution of quantum entanglement is investigated for an anisotropic quantum XY model with variable range interactions and in the presence of a uniform transverse magnetic field. We report the possibility of qualitative growth in entanglement with an increase in the range of interactions that vary either exponentially or polynomially as the distance between the sites increases. Interestingly, we find that such entanglement enhancement is not ubiquitous and is dependent on the factorization points, a specific set of system parameters where the zero-temperature state of the system is fully separable. In particular, we observe that at zero-temperature, when the system parameters are chosen beyond the pair of factorization points, the increments in entanglement length due to variable range interactions are more pronounced compared to the situation when the parameters lie in between the factorization points. We also note that the factorization points get reallocated depending on the laws of interaction fall-offs. We reveal that the temperature at which the canonical equilibrium state becomes entangled from an unentangled one increases with the increase in the range of interactions, thereby demonstrating enhanced robustness in entanglement against temperature in the presence of long-range interactions. Interestingly, however, such robustness in entanglement is observed only when the system parameters are chosen between the pair of factorization points." @default.
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- W3035705874 date "2020-06-16" @default.
- W3035705874 modified "2023-10-16" @default.
- W3035705874 title "Distribution of entanglement with variable range interactions" @default.
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