Discrete phase measurements and the Bell inequality

Abstract

We present a formulation of the Bell inequalities using simple correlated photon number states and phase measurements. Such tests generally require binning of the information, and this effect is closely examined. Our proposal opens up the opportunity for a new novel test of quantum mechanics versus local realism. Some insight in entanglement in such systems may be achieved.

Entanglement measure using Wigner function: Case of generalized vortex state formed by multiphoton subtraction

“…The entanglement of formation or concurrence has been a topic of much interest lately. Although originally formulated to quantify pure state entanglement, it was later extended to mixed states [8][9][10][11].…”