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Study of the cloning fidelities for the entanglement of a pair of quantum bits

โœ Scribed by Chang Lin; Mai-mai Lin

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
245 KB
Volume
14
Category
Article
ISSN
1007-5704

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โœฆ Synopsis

The cloning fidelities is broadly investigated for the entanglement of a pair of quantum bits. Some new analytical descriptions of the cloning fidelities have been obtained for the entanglement of a pair of quantum bits, generalizing asymmetric cloning transformations and considering a special circumstance. We derive some intact mathematical expressions and simulation results, having the extensive physics meaning, for the investigation of the separability-preserving cloning machine that duplicates all entangled states of two qubits.

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We consider the change of entanglement of formation E produced by the Hadamard-CNOT circuit on a general (pure or mixed) state describing a system of two qubits. We study numerically the probabilities of obtaining di erent values of E, assuming that the initial state is randomly distributed in the s