Entanglement measurement of the quadrature components without the homodyne detection in the spatially multi-mode far-field

TL;DR

This paper proposes a novel method for measuring entanglement of quadrature components in multi-mode far-field without homodyne detection, utilizing coherent non-classical light sources and pixellised sources.

Contribution

It introduces a measurement scheme that bypasses homodyne detection by using phase-locked sub-Poissonian lasers or optical parametric oscillators as sources.

Findings

Theoretical framework for pixellised sources of spatio-temporal squeezed light

Demonstration of entanglement measurement without homodyne detection

Potential for simplified quantum optical measurements

Abstract

We consider the measuring procedure that in principle allows to avoid the homodyne detection for the simultaneous selection of both quadrature components in the far-field. The scheme is based on the use of the coherent sources of the non-classical light. The possibilities of the procedure are illustrated on the basis of the use of pixellised sources, where the phase-locked sub-Poissonian lasers or the degenerate optical parametric oscillator generating above threshold are chosen as the pixels. The theory of the pixellised source of the spatio-temporal squeezed light is elaborated as a part of this investigation.