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Please use this identifier to cite or link to this item: http://nbn-resolving.de/urn:nbn:de:hebis:34-2018020654484

Title: Beating the limits with initial correlations
Authors: Basilewitsch, DanielSchmidt, RebeccaSugny, DominiqueManiscalco, SabrinaKoch, Christiane P.
???metadata.dc.subject.ddc???: 530 - Physik (Physics)
Issue Date: 28-Nov-2017
Citation: In: New Journal of Physics. - London : IOP. - 19(2017) 113042
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.
URI: urn:nbn:de:hebis:34-2018020654484
additional URI: doi:10.1088/1367-2630/aa96f8OA-GEF
ISSN: 1367-2630
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