4 August 2003 Measures of decoherence
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Methods for quantifying environmentally induced decoherence in quantum systems are investigated. We formulate criteria for measuring the degree of decoherence and consider several representative examples, including a spin interacting with the modes of a bosonic, e.g., phonon, bath. We formulate an approach based on the operator norm measuring the deviation of the actual density matrix from the ideal one which would describe the system without environmental interactions.
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Leonid Fedichkin, Arkady Fedorov, Vladimir Privman, "Measures of decoherence", Proc. SPIE 5105, Quantum Information and Computation, (4 August 2003); doi: 10.1117/12.486792; https://doi.org/10.1117/12.486792

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