Improved implementation of nonclassicality test for a single particle

TL;DR

This paper presents an optimized experimental test of nonclassicality for a single qubit, achieving a significant violation of classicality through improved detector efficiency and noise reduction.

Contribution

The authors significantly improved the nonclassicality test implementation, achieving a 46 standard deviation violation by utilizing higher efficiency visible detectors.

Findings

Achieved a 46 standard deviation violation of classicality.

Moved from infrared to visible spectrum for better detector performance.

Enhanced experimental setup leading to a fivefold improvement over previous results.

Abstract

Recently a test of nonclassicality for a single qubit was proposed [R. Alicki and N. Van Ryn, J. Phys. A: Math. Theor. 41, 062001 (2008)]. We present an optimized experimental realization of this test leading to a 46 standard deviation violation of classicality. This factor of 5 improvement over our previous result was achieved by moving from the infrared to the visible where we can take advantage of higher efficiency and lower noise photon detectors.