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Oxford Quantum Talks Archive

Isolation and information flow in quantum dynamics

Michael Westmoreland, Denison University
Quantum Physics and Logic 2010, May 2010, University of Oxford

From the structure of quantum dynamics for closed and open systems, we derive several general results about information flow between interacting systems, which can be expressed in diagrammatic form. Conditions on information flow (e.g., that no information is transferred from system A to system B) imply that the overall dynamical evolution has a particular structure. We also show that one simple type of two-qubit interaction, the unitary CNOT gate, cannot be represented by local operations and a single simultaneous information exchange.

[video] [streaming video]