Map-dependent quantum characteristic functions characterize complete positivity of channels and CP-divisibility of dynamical maps through positivity of associated Gram matrices.
Nakagawa, Thermo-field entanglement description of markovian two-state relaxation (2026), arXiv:2601.12435 [quant-ph]
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Map-Dependent Quantum Characteristic Functions and CP-Divisibility in Non-Markovian Quantum Dynamics
Map-dependent quantum characteristic functions characterize complete positivity of channels and CP-divisibility of dynamical maps through positivity of associated Gram matrices.