Coupling-Deformed Pointer Observables and Weak Values

TL;DR

This paper introduces a method to obtain weak-value information exactly through strong measurements by measuring coupling-deformed pointer observables, addressing key issues of traditional weak measurement techniques.

Contribution

It presents a novel approach that combines the benefits of weak measurements with the accuracy of strong measurements, overcoming previous limitations.

Findings

Exact weak-value information can be obtained via strong measurements.

The method addresses issues of universality, bias, and inefficiency in weak measurements.

The approach maintains advantages of weak measurement schemes while improving reliability.

Abstract

While the novel applications of weak values have recently attracted wide attention, weak measurement, the usual way to extract weak values, suffers from risky approximations and severe quantum noises. In this paper, we show that the weak-value information can be obtained exactly in strong measurement with postselections, via measuring the coupling-deformed pointer observables, i.e., the observables selected according to the coupling strength. With this approach, we keep all the advantages claimed by weak-measurement schemes and at the same time solve some widely criticized problems thereof, such as the questionable universality, systematical bias, and drastic inefficiency.