Two photon amplitude of partially coherent partially entangled electromagnetic fields

TL;DR

This paper develops a comprehensive theoretical framework for two-photon amplitudes in partially coherent, partially entangled electromagnetic fields, revealing how coherence properties influence entanglement and statistical behavior in quantum optics.

Contribution

It introduces a novel characterization of two-photon amplitudes for partially coherent fields using generalized Siegert relations and coherence theory, including a new entanglement measure and bounds.

Findings

Correlation properties are preserved under parametric down-conversion.

A measure of entanglement is proposed with bounds related to the golden ratio.

Transition zones between super-Poisson and sub-Poisson statistics are identified.

Abstract

The development of efficient protocols for pure and mixed states preparation is challenging task. Most of the theory of quantum information applications has been developed for fully coherent or completely incoherent light. However, in many situations of interest partially coherent light has been proved to be a more robust model of radiation. In this paper the underpinning theory of two photon amplitude functions for down-converted fields with partially coherent pump beams is investigated. By using the generalised Siegert relations and the coherent mode representation of the cross spectral density matrix the two photon amplitude is fully characterised for partially coherent beams. A number of correlation properties from modern coherence theory are demonstrated to be preserved under parametric down-conversion. Based on the generalised Siegert relations and the Cauchy-Schwarz inequality a measure of entanglement for the two photon amplitude is proposed. Upper bounds for this measure are found in terms of the \emph{golden ratio} for maximally entangled states. Two inequalities are derived for the two photon amplitude for which there exist a transition zone from super-Poisson statistics to sub-Poisson statistics for down-converted partially coherent fields.