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Beating the limits with initial correlations
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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New Journal of Physics, Volume 19, issue 11, pp. 1-16
Abstract
Fast and reliable reset of a qubit is a key prerequisite for any quantum technology. For real world open quantum systems undergoing non-Markovian dynamics, reset implies not only purification, but in particular erasure of initial correlations between qubit and environment. Here, we derive optimal reset protocols using a combination of geometric and numerical control theory. For factorizing initial states, we find a lower limit for the entropy reduction of the qubit as well as a speed limit. The time-optimal solution is determined by the maximum coupling strength. Initial correlations, remarkably, allow for faster reset and smaller errors. Entanglement is not necessary.
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Basilewitsch, D, Schmidt, R, Sugny, D, Maniscalco, S & Koch, C P 2017, 'Beating the limits with initial correlations', New Journal of Physics, vol. 19, no. 11, 113042, pp. 1-16. https://doi.org/10.1088/1367-2630/aa96f8