Measurement-induced quantum operations on multiphoton states

TL;DR

This paper explores how measurement on part of multiphoton states from optical parametric amplification affects their quantum properties and assesses the potential for non-locality tests without extra assumptions.

Contribution

It introduces a detailed analysis of measurement-induced modifications on multiphoton quantum states and their application to non-locality testing.

Findings

Measurement can modify macroqubit features.

Different measurement strategies influence state properties.

Potential for assumption-free non-locality tests.

Abstract

We investigate how multiphoton quantum states obtained through optical parametric amplification can be manipulated by performing a measurement on a small portion of the output light field. We study in detail how the macroqubit features are modified by varying the amount of extracted information and the strategy adopted at the final measurement stage. At last the obtained results are employed to investigate the possibility of performing a microscopic-macroscopic non-locality test free from auxiliary assumptions.