Quantum Information Processing

, Volume 2, Issue 3, pp 207–220 | Cite as

Spin Squeezing Criterion with Local Unitary Invariance

Article

Abstract

We propose a spin squeezing criterion for arbitrary multi-qubit states that is invariant under local unitary operations. We find that, for arbitrary pure two-qubit states, spin squeezing is equivalent to entanglement, and multi-qubit states are entangled if this new spin squeezing parameter is less than unity.

PACS: 03.67.-a; 03.65.Ud

Spin squeezing entanglement local unitary invariance 

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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  1. 1.Australian Centre for Quantum Computer Technology, Department of PhysicsMacquarie UniversitySydneyAustralia
  2. 2.Department of PhysicsBangalore UniversityBangaloreIndia

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