Weak interference in the high-signal regime

Abstract

Weak amplification is a signal enhancement technique which is used to measure tiny changes that otherwise cannot be determined because of technical limitations. It is based on the existence of a special type of interaction which couples a property of a system, i.e., polarization or which-path information, with a separate degree of freedom, i.e., transverse position or frequency. Unfortunately, the weak amplification process is generally accompanied by severe losses of the detected signal, which limits the applicability of the weak amplification concept. However, we will show here that since the weak measurement concept is essentially an interference phenomena, it should be possible to use the degree of interference to get relevant information about the physical system under study in a more general scenario, where the signal is not severely depleted (high-signal regime). This can widen the range of systems where the weak measurement concept can be applied. In this scenario, which can be called generally weak interference, the idea of weak value does not convey any useful information.

7 pages

References in corpus (4)

• Ultrasensitive Beam Deflection Measurement via Interferometric Weak Value Amplification
• Optimizing the Signal to Noise Ratio of a Beam Deflection Measurement with Interferometric Weak Values
• Precision frequency measurements with interferometric weak values
• Weak value amplification in a shot-noise limited interferometer

Cited by in corpus (5)

• Measurement of sub-pulse-width temporal delays via spectral interference induced by weak value amplification
• Enhancement of the sensitivity of a temperature sensor based on Fiber Bragg Gratings via weak value amplification
• Extracting joint weak values from two-dimensional spatial displacements
• Demonstration of a highly-sensitive tunable beam displacer with no movable elements based on the concept of weak value amplification
• Weak value amplification: a view from quantum estimation theory that highlights what it is and what isn't