Journal
NEW JOURNAL OF PHYSICS
Volume 16, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/16/6/065023
Keywords
quantum control; open quantum systems; spin bath
Categories
Funding
- Eleanor James Scholarship
- Aberystwyth Doctoral Career Developement Scholarship
- MIUR through PRIN [2010LLKJBX]
- QYMRU through IMAPS summer fellowship
- QSTAR is the MPQ, LENS, IIT, UniFi Joint Center for Quantum Science and Technology
- National Science Foundation [NSF PHY11-25915]
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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.
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