ua nt - p h / 06 01 04 4 v 1 7 J an 2 00 6 A convex combination of product states for the separable Werner state
نویسندگان
چکیده
In this paper, we write down the separable Werner state in a two-qubit system as a convex combination of product states explicitly. The Werner state in a two-qubit system has a single real parameter and varies from inseparable state to separable state according to the value of its parameter. The convex combination of product states gives a hidden variable model to the separable Werner state.
منابع مشابه
ua nt - p h / 06 01 04 5 v 1 7 J an 2 00 6 Entanglement and Teleportation of Gaussian States of the Radiation Field
We propose a reliable entanglement measure for a two-mode squeezed thermal state of the quantum electromagnetic field in terms of its Bures distance to the set of all separable states of the same kind. The requisite Uhlmann fidelity of a pair of two-mode squeezed thermal states is evaluated as the maximal transition probability between two four-mode purifications. By applying the Peres-Simon cr...
متن کاملar X iv : q ua nt - p h / 06 11 04 5 v 1 3 N ov 2 00 6 Entanglement properties in the Inhomogeneous Tavis - Cummings model
Quantum correlations have played a central role from the very beginning of Quantum Mechanics, and currently the concept of Entanglement has become a key resource in the research on quantum information and quantum computation [1]. The availability of entangled quantum states and their characterization are among the most important questions in quantum information. In this sense, there have been a...
متن کاملar X iv : q ua nt - p h / 06 08 19 7 v 2 1 4 M ay 2 00 7 MATRIX PRODUCT STATE REPRESENTATIONS
This work gives a detailed investigation of matrix product state (MPS) representations for pure multipartite quantum states. We determine the freedom in representations with and without translation symmetry, derive respective canonical forms and provide efficient methods for obtaining them. Results on frustration free Hamiltonians and the generation of MPS are extended, and the use of the MPS-r...
متن کاملnt - p h / 05 06 04 3 v 1 6 J un 2 00 5 Segre variety , conifold , Hopf fibration , and separable multi - qubit states
We establish relations between Segre variety, conifold, Hopf fibration, and separable sets of pure two-qubit states. Moreover, we investigate the geometry and topology of separable sets of pure multi-qubit states based on a complex multi-projective Segre variety and higher order Hopf fibration.
متن کامل