Unidirectional bosonic quantum walk and entanglement redistribution from high-dimensional quantum states with tunable entropies
Raktim Haldar, Robert Johanning, Philip Rübeling, Anahita Khodadad Kashi, Thomas Bækkegaard, Surajit Bose, Nikolaj Thomas Zinner, Michael Kues · 2023
We generate high-dimensional bi-photon quantum frequency combs with tunable entropies exploiting the second-order nonlinearity of a periodically-poled lithium niobate waveguide through a novel pumping and filtering scheme. Using these quantum states with varying degrees of entanglement, we demonstrate unidirectional bosonic quantum walks, asymmetric energy transfer, and entanglement transport. Our non-maximally entangled quantum states can serve as excellent testbeds for several computational protocols. Moreover, we achieve the steering of the directionality in a scalable format, which enables a new control mechanism for quantum walks as well as novel modification means of joint probability distributions.