Improved sensing with a single qubit

Improved sensing with a single qubit

Seminar author:Pavel Sekatski

Event date and time:07/13/2016 02:30:pm

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We consider frequency estimation with a arbitrary prior knowledge of the parameter. We demonstrate that a single sensing two-level system can act as a virtual multi-level system that offers increased precision in such a Bayesian frequency estimation scenario, and that allows one to estimate (arbitrary) large parameter values by avoiding phase wraps. This is achieved by making use of additional degrees of freedom or auxiliary systems not influenced by the sensing interaction. The joint system is manipulated by intermediate control operations in such a way that an effective Hamiltonian with an appropriate spectrum is generated.