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.
Original language | English |
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Article number | 065023 |
Pages (from-to) | 1-20 |
Number of pages | 20 |
Journal | New Journal of Physics |
Volume | 16 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2014 |
Externally published | Yes |
Keywords
- quantum control
- open quantum systems
- spin bath