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We fully characterize the reduced dynamics of an open quantum system initially correlated with its environment. Using a photonic qubit coupled to a simulated environment, we tomographically reconstruct a superchannel - a generalized channel that treats preparation procedures as inputs - from measurement of the system alone. We introduce novel quantitative measures for determining the strength of initial correlations, and to allow an experiment to be optimized in regard to its environment.
Bibliographical noteRingbauer, M., Wood, C. J., Modi, K., Gilchrist, A., White, A. G. & Fedrizzi, A., Physical review letters, 114, 090402, 2015. Copyright 2015 by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevLett.114.090402
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