Beating the limits with initial correlations
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2017-11-01
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
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.Description
Keywords
quantum control, state preparation, superconducting qubits
Other note
Citation
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