Beating the limits with initial correlations

Basilewitsch D, Schmidt R, Sugny D, Maniscalco S, Koch CP (2017)

Publication Type: Journal article

Publication year: 2017

Journal

New Journal of Physics Institute of Physics: Open Access Journals / Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft

Book Volume: 19

Article Number: 113042

Journal Issue: 11

DOI: 10.1088/1367-2630/aa96f8

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.

Involved external institutions

Universität Kassel DE Germany (DE) University of Turku / Turun yliopisto FI Finland (FI) Université Bourgogne Franche-Comté FR France (FR)

How to cite

APA:

Basilewitsch, D., Schmidt, R., Sugny, D., Maniscalco, S., & Koch, C.P. (2017). Beating the limits with initial correlations. New Journal of Physics, 19(11). https://doi.org/10.1088/1367-2630/aa96f8

MLA:

Basilewitsch, Daniel, et al. "Beating the limits with initial correlations." New Journal of Physics 19.11 (2017).

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