Quantum random walks with multiphoton interference and high order correlation functions

TL;DR

This paper simulates quantum random walks with multiple photons using beam splitters and detectors, highlighting multiphoton interference effects and introducing coincidence detection schemes with Feynman diagrams for explanation.

Contribution

It presents a novel simulation setup for quantum random walks with multiphoton interference and introduces new detection schemes with intuitive Feynman diagram explanations.

Findings

Demonstration of multiphoton interference effects in quantum walks

Introduction of one, two, and threefold coincidence detection schemes

Use of Feynman diagrams to explain interference phenomena

Abstract

We show a simulation of quantum random walks with multiple photons using a staggered array of 50/50 beam splitters with a bank of detectors at any desired level. We discuss the multiphoton interference effects that are inherent to this setup, and introduce one, two, and threefold coincidence detection schemes. The use of Feynman diagrams are used to intuitively explain the unique multiphoton interference effects of these quantum random walks.