Probing quantum walks through coherent control of high-dimensionally entangled photons.

ABSTRACT: Control over the duration of a quantum walk is critical to unlocking its full potential for quantum search and the simulation of many-body physics. Here we report quantum walks of biphoton frequency combs where the duration of the walk, or circuit depth, is tunable over a continuous range without any change to the physical footprint of the system-a feature absent from previous photonic implementations. In our platform, entangled photon pairs hop between discrete frequency modes with the coupling between these modes mediated by electro-optic modulation of the waveguide refractive index. Through control of the phase across different modes, we demonstrate a rich variety of behavior: from walks exhibiting enhanced ballistic transport or strong energy confinement, to subspaces featuring scatter

SUBMITTER: Imany P 

PROVIDER: S-EPMC7439509 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature