Threshold for a discrete-variable sensor of quantum reservoirs
Wei Wu,
Zhen Peng,
Si-Yuan Bai
et al.
Abstract:Quantum sensing employs quantum resources of a sensor to attain a smaller estimation error of physical quantities than the limit constrained by classical physics. To measure a quantum reservoir, which is significant in decoherence control, a nonunitray-encoding sensing scheme becomes necessary. However, previous studies showed that the reservoir-induced degradation to quantum resources of the sensor makes the errors divergent with the increase of encoding time. We here propose a scheme to use N two-level syste… Show more
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