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Spin Squeezing Criterion with Local Unitary Invariance

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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

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Authors and Affiliations

  1. Australian Centre for Quantum Computer Technology, Department of Physics, Macquarie University, Sydney, New South Wales, 2109, Australia

    A.R. Usha Devi, Xiaoguang Wang & B.C. Sanders

  2. Department of Physics, Bangalore University, Jnanabharathi Campus, Bangalore, 560 056, India

    A.R. Usha Devi

Authors
  1. A.R. Usha Devi
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  2. Xiaoguang Wang
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  3. B.C. Sanders
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Correspondence to B.C. Sanders.

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Usha Devi, A., Wang, X. & Sanders, B. Spin Squeezing Criterion with Local Unitary Invariance. Quantum Information Processing 2, 207–220 (2003). https://doi.org/10.1023/B:QINP.0000004125.12489.f4

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  • DOI: https://doi.org/10.1023/B:QINP.0000004125.12489.f4

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