Dynamics of Two Qubits: Decoherence and an Entanglement Optimization Protocol

Details Dynamics of Two Qubits: Decoherence and an Entanglement Optimization Protocol Dynamics of Two Qubits: Decoherence and an Entanglement Optimization Protocol

2005-04-08

arxiv.org/abs/quant-ph/0504051v4

Physics

Quantum Physics

6 pages, 1 figure. Changed the format and added one whole section. Title slightly changed

Scientific paper

The evolution of two qubits coupled by a general nonlocal interaction is studied in two distinct regimes. In the first regime the purity of the individual qubits is interchanged through the entanglement shared by the two. We illustrate how this can be a mechanism for decoherence. In the second regime, the interaction entangles two initially pure qubits. The dynamical maps for the reduced unitary evolution of both initially simply separable and not-simply-separable states are found. We outline a protocol for optimizing the entanglement generation subject to constraints.

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