All (qubit) decoherences: Complete characterization and physical implementation

Details All (qubit) decoherences: Complete characterization and physical implementation All (qubit) decoherences: Complete characterization and physical implementation

2005-05-06

arxiv.org/abs/quant-ph/0505040v2

Phys.Rev.A 72, 022110 (2005)

Physics

Quantum Physics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevA.72.022110

We investigate decoherence channels that are modelled as a sequence of collisions of a quantum system (e.g., a qubit) with particles (e.g., qubits) of the environment. We show that collisions induce decoherence when a bi-partite interaction between the system qubit and an environment (reservoir) qubit is described by the controlled-U unitary transformation (gate). We characterize decoherence channels and in the case of a qubit we specify the most general decoherence channel and derive a corresponding master equation. Finally, we analyze entanglement that is generated during the process of decoherence between the system and its environment.

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