Qubit feedback and control with kicked quantum nondemolition measurements: A quantum Bayesian analysisReport as inadecuate



 Qubit feedback and control with kicked quantum nondemolition measurements: A quantum Bayesian analysis


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The informational approach to continuous quantum measurement is derived from POVM formalism for a mesoscopic scattering detector measuring a charge qubit. Quantum Bayesian equations for the qubit density matrix are derived, and cast into the form of a stochastic conformal map. Measurement statistics are derived for kicked quantum nondemolition measurements, combined with conditional unitary operations. These results are applied to derive a feedback protocol to produce an arbitrary pure state after a weak measurement, as well as to investigate how an initially mixed state becomes purified with and without feedback.



Author: Andrew N. Jordan; Alexander N. Korotkov

Source: https://archive.org/







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