Restricted quantum control of spin chains |
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| Daniel Burgarth | |
| University of Oxford | |
| We discuss the indirect control of a chain of coupled two-level systems by acting on its end(s) only. We show how it is possible to obtain knowledge on all coupling strengths despite the restricted access, and how this knowledge might be used to achieve simple control tasks such as coherent transfer, state preparation, and even arbitrary operations. Finally we treat the spin chain as an open system and present relationships between controllability, information transfer and relaxation. |