All (qubit) decoherences: Complete characterization and physical implementation

Abstract

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.

10 pages, 3 figures

References in corpus (2)

• General Monogamy Inequality for Bipartite Qubit Entanglement
• Quantum Channels with Memory

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