Optimal unbiased state characterization
Isabel Sainz, Juan J. D\'iaz, and Andrei B. Klimov
TL;DR
This paper introduces a method for characterizing bipartite quantum states where one subsystem is accessible and the other is not, using interference measurements after local transformations.
Contribution
It presents a novel approach to state characterization that leverages interference measurements and local operations to infer properties of inaccessible subsystems.
Findings
Effective characterization of inaccessible subsystem states
Utilizes interference measurements for state inference
Applicable to bipartite systems with controllable and uncontrollable parts
Abstract
We propose a general approach to characterize states of a bipartite system composed by a fully controllable and an unaccessible subsystems. The method is based on the measuring interference between states of the uncontrollable subsystem obtained after projecting an appropriately transformed bipartite state on the basis of the accessible subsystem by local operations.
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