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Classification of Four-Qubit States by Means of a Stochastic Local Operation and the Classical Communication Invariant |
| ZHA Xin-Wei**, MA Gang-Long
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School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710121
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| Cite this article: |
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ZHA Xin-Wei, MA Gang-Long 2011 Chin. Phys. Lett. 28 020301 |
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Abstract It is a recent observation that entanglement classification for qubits is closely related to stochastic local operations and classical communication (SLOCC) invariants. Verstraete et al.[Phys. Rev. A 65 (2002) 052112] showed that for pure states of four qubits there are nine different degenerate SLOCC entanglement classes. Li et al.[Phys. Rev. A 76 (2007) 052311] showed that there are at least 28 distinct true SLOCC entanglement classes for four qubits by means of the SLOCC invariant and semi-invariant. We give 16 different entanglement classes for four qubits by means of basic SLOCC invariants.
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| Keywords:
03.67.Hk
03.65.Ud
03.65.Fd
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Received: 17 June 2010
Published: 30 January 2011
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[9] Zha X W and Ren K F 2008 Phys. Rev. A 77 014306
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