Kraus decomposition for chaotic environments including time-dependent subsystem Hamiltonians

Details Kraus decomposition for chaotic environments including time-dependent subsystem Hamiltonians Kraus decomposition for chaotic environments including time-dependent subsystem Hamiltonians

2007-10-08

arxiv.org/abs/0710.1659v1

Physics Letters A, Volume 372, Issue 8, 18 February 2008, Pages 1194-1204

Physics

Quantum Physics

Scientific paper

10.1016/j.physleta.2007.09.047

We derive an exact and explicit Kraus decomposition for the reduced density of a quantum system simultaneously interacting with time-dependent external fields and a chaotic environment of thermodynamic dimension. We test the accuracy of the Kraus decomposition against exact numerical results for a CNOT gate performed on two qubits of an $(N+2)$-qubit statically flawed isolated quantum computer. Here the $N$ idle qubits comprise the finite environment. We obtain very good agreement even for small $N$.

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