najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1093Research ArticlePHYSICSФИЗИКАReduced conditional dynamic of quantum system under indirect quantum measurementTrifanovA. I.

197101, 49 Kronverksky, Saint Petersburg

alextrifanov@gmail.comMiroshnichenkoG. P.

197101, 49 Kronverksky, Saint Petersburg

gpmirosh@gmail.comSaint Petersburg National Research University of Information Technologies, Mechanics and OpticsRussian Federation20131708202545635–647Copyright © Trifanov A.I., Miroshnichenko G.P., 20252025Trifanov A.I., Miroshnichenko G.P.Trifanov A.I., Miroshnichenko G.P.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1093

In this report, we study the reduced conditional dynamics of a quantum system in the case of indirect quantum measurement. The detector’s microscopic part (pointer) interacts with the measured system (target) and the environment, which results in a nonunitary interaction between target and pointer. The quantum state evolution conditioned by the measurement result is under investigation. Particularly, we are interested in explicit analytical expressions for the conditional evolution superoperators and basic information characteristics of this measurement process, which is applied to the cavity mode photodetection problem.

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The authors declare that there are no conflicts of interest present.