A1 Journal article – refereed
Beating the limits with initial correlations




List of Authors: Daniel Basilewitsch, Rebecca Schmidt, Dominique Sugny, Sabrina Maniscalco, Christiane P. Koch
Publisher: Institute of Physics Publishing
Publication year: 2017
Journal: New Journal of Physics
Journal name in source: New Journal of Physics
Volume number: 19
Issue number: 11
Number of pages: 16
ISSN: 1367-2630

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 timeoptimal
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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Last updated on 2019-16-07 at 18:09