Abstract
We develop a theory of linear witnesses for detecting non-Markovianity, based on the geometric structure of the set of Choi states for all Markovian evolutions having Lindblad-type generators. We show that the set of all such Markovian Choi states form a convex and compact set under the small time interval approximation. Invoking geometric Hahn–Banach theorem, we construct linear witnesses to separate a given non-Markovian Choi state from the set of Markovian Choi states. We present examples of such witnesses for dephasing channel and Pauli channel in case of qubits. Furthermore, we have devised another method of detection NM of various qubit channels, by using projective measurements in the Bell basis. This can be done without the knowledge of what specific kind of channel we are dealing with. This gives us a huge operational advantage for NM detection. We further investigate the geometric structure of the Markovian Choi states to find that they do not form a polytope. This presents a platform to consider nonlinear improvement of non-Markovianity witnesses.
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Acknowledgements
Authors thank Manik Banik of SNBNCBS, Kolkata, for illuminating discussion. SB thanks SERB, DST, Government of India, for financial support. BB thanks DST INSPIRE programme for financial support.
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Bhattacharya, B., Bhattacharya, S. Convex geometry of Markovian Lindblad dynamics and witnessing non-Markovianity. Quantum Inf Process 20, 253 (2021). https://doi.org/10.1007/s11128-021-03177-y
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DOI: https://doi.org/10.1007/s11128-021-03177-y