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Equivalence between two-mode spin squeezed states and pure entangled states with equal spin

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Dominic W Berry1,2,3 and Barry C Sanders2,3

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LETTER TO THE EDITOR

We prove that a pure entangled state of two subsystems with equal spin is equivalent to a two-mode spin-squeezed state under local operations except for a set of bipartite states with measure zero, and provide a counterexample to the generalization of this result to two subsystems of unequal spin.


PACS

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

MSC

81R30 Coherent states (See also 22E45); squeezed states (See also 81V80)

Subjects

Quantum information and quantum mechanics

Dates

Issue 14 (8 April 2005)

Received 11 January 2005, in final form 25 February 2005

Published 21 March 2005



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