Physics – Quantum Physics
Scientific paper
2005-09-02
J. Opt. B: Quantum Semiclass. Opt. 7, S740 (2005)
Physics
Quantum Physics
5 pages, no figures
Scientific paper
10.1088/1464-4266/7/12/042
Non-local properties of symmetric two-qubit states are quantified in terms of a complete set of entanglement invariants. We prove that negative values of some of the invariants are signatures of quantum entanglement. This leads us to identify sufficient conditions for non-separability in terms of entanglement invariants. Non-local properties of two-qubit states extracted from (i) Dicke state (ii) state generated by one-axis twisting Hamiltonian, and (iii) one-dimensional Ising chain with nearest neighbour interaction are analyzed in terms of the invariants characterizing them.
Prabhu Ramada
Sudha
Uma M. S.
Usha Devi A. R.
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