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Quantum dynamics as a physical resource

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arxiv quant-ph/0208077 v3 pith:4YFPHBF6 submitted 2002-08-13 quant-ph

Quantum dynamics as a physical resource

classification quant-ph
keywords quantumcomplexitymeasuresoperationresourcesstrengththeoryapplications
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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How useful is a quantum dynamical operation for quantum information processing? Motivated by this question we investigate several strength measures quantifying the resources intrinsic to a quantum operation. We develop a general theory of such strength measures, based on axiomatic considerations independent of state-based resources. The power of this theory is demonstrated with applications to quantum communication complexity, quantum computational complexity, and entanglement generation by unitary operations.

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