A quantum router for high-dimensional entanglement

Author(s): M. Erhard, M. Malik, A. Zeilinger

Journal: Quantum Science and Technology

Page(s): in press

Year: 2016

DOI Number: 10.1088/2058-9565/aa5917

Link: Link to publication

Abstract:

In addition to being a workhorse for modern quantum technologies, entanglement plays a key role in fundamental tests of quantum mechanics. The entanglement of photons in multiple levels, or dimensions, explores the limits of how large an entangled state can be, while also greatly expanding its applications in quantum information. Here we show how a high-dimensional quantum state of two photons entangled in their orbital angular momentum can be split into two entangled states with a smaller dimensionality structure. Our work demonstrates that entanglement is a quantum property that can be subdivided into spatially separated parts. In addition, our technique has vast potential applications in quantum as well as classical communication systems.