Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum information: Quantum computers and communication I
Q 59.3: Talk
Friday, March 21, 2014, 11:00–11:15, DO26 207
Control of open quantum system: Case study of the central spin model — •Christian Arenz1, Giulia Gualdi2, and Daniel Burgarth1 — 1Department of Mathematics and Physics, Aberystwyth University, Aberystwyth, Wales — 2Dipartimento di Fisica ed Astronomia, Universita di Firenze, Firenze, Italy
We study the controllability of a central spin guided by a classical field and interacting with a spin bath, showing 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.