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Title of Journal: Pramana J Phys

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Abbravation: Pramana

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Springer India

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0973-7111

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Spin–momenta entanglement in moving frames Proper

Authors: S RASTGOO M M GOLSHAN
Publish Date: 2013/08/30
Volume: 81, Issue: 3, Pages: 385-393
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Abstract

The fact that spin–momentum of massive particles become entangled disentangled as seen by moving observers is used to investigate the properties of von Neumann entropy as a measure of spin–momentum entanglement To do so we partition the total Hilbert space into momentum and spin subspaces so that the entanglement occurs between total spin states and total momenta of two spinfrac12 particles Assuming that the occurrence of spin–momentum states is determined by Gaussian probability distributions we show that the degree of entanglement ascends for small rapidities reaches a maximum and diminishes at high rapidity We further report how the characteristics of this behaviour vary as the widths of distributions change In particular a separable state resulting from equal distribution widths indeed becomes entangled in moving frames

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