Work

Control of open quantum systems: case study of the central spin model

Year: 2014

Type: article

Abstract: We study the controllability of a central spin guided by a classical field and interacting with a spin bath and show that the central spin is fully controllable independently of the number of bath spins. Additionally we find that for unequal system-bath couplings even the bath becomes controllable by acting on the central spin alone. We then analyze numerically how the time to implement gates on the central spin scales with the number of bath spins and conjecture that for equal system-bath couplings it reaches a saturation value. We provide evidence that sometimes noise can be effectively suppressed through control.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/16/6/065023

Authors: Christian Arenz, Giulia Gualdi, Daniel Burgarth

Institutions: Aberystwyth University, Quantum Science and Technology in Arcetri, University of Florence

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,610

Funders: National Science Foundation, Ministero dell’Istruzione, dell’Università e della Ricerca, Università degli Studi di Firenze, Kavli Institute for Theoretical Physics, University of California, Santa Barbara