Aufsatz
Artikel (Publikationen im Open Access gefördert durch die UB)
Beating the limits with initial correlations
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.
Citation
In: New Journal of Physics. - London : IOP. - 19(2017) 113042Sponsorship
Gefördert durch den Publikationsfonds der Universität KasselCollections
Publikationen (Theoretische Physik III - Quantendynamik und -kontrolle)Artikel (Publikationen im Open Access gefördert durch die UB)
Citation
@article{urn:nbn:de:hebis:34-2018020654484,
author={Basilewitsch, Daniel and Schmidt, Rebecca and Sugny, Dominique and Maniscalco, Sabrina and Koch, Christiane P.},
title={Beating the limits with initial correlations},
year={2017}
}
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2018-02-06T12:39:02Z 2018-02-06T12:39:02Z 2017-11-28 1367-2630 urn:nbn:de:hebis:34-2018020654484 http://hdl.handle.net/123456789/2018020654484 Gefördert durch den Publikationsfonds der Universität Kassel eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ quantum control superconducting qubits state preparation 530 Beating the limits with initial correlations Aufsatz 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. open access In: New Journal of Physics. - London : IOP. - 19(2017) 113042 Basilewitsch, Daniel Schmidt, Rebecca Sugny, Dominique Maniscalco, Sabrina Koch, Christiane P. doi:10.1088/1367-2630/aa96f8
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