Shaping the waveform of entangled photons

TL;DR

This paper experimentally demonstrates tunable control over the joint spectrum of entangled photon pairs generated via spontaneous parametric downconversion, using the spatial shape of the pump beam, with potential applications to other entangled photon sources.

Contribution

It introduces a method to control the frequency correlations of entangled photons through pump beam shaping, expanding the toolkit for quantum photonics.

Findings

Controlled the joint spectrum of entangled photons experimentally.

Showed the technique's applicability to other photon sources.

Enhanced tunability of photon waveforms for quantum information.

Abstract

We demonstrate experimentally the tunable control of the joint spectrum, i.e. waveform and degree of frequency correlations, of paired photons generated in spontaneous parametric downconversion. This control is mediated by the spatial shape of the pump beam in a type-I noncollinear configuration. We discuss the applicability of this technique to other sources of frequency entangled photons, such as electromagnetically induced Raman transitions.