Southwest Quantum Information and Technology

Designing quantum networks of optically connected microwave systems limited by transduction

Presenting Author: Akira Kyle, University of Colorado
Contributing Author(s): Curtis L. Rau, Alex Kwiatkowski, Ezad Shojaee, John D. Teufel, Konrad W. Lehnert, Tasshi Dennis

Transduction will likely be the bottleneck in quantum networks of optically connected microwave systems, and so these networks will need to leverage the resources which are more readily available in the optical and microwave domains. We begin by characterizing the set of networks involving doubly parametric transducers, such as electro-opto-mechanical devices, when only allowing for optical Gaussian states and operations, but no measurements. We find that even under these constraints, there is no optimal network with respect to the transducer's experimentally limited parameters. For example, the optimal network for a transducer with large quantum cooperativities but limited efficiencies is different than the optimal network for a transducer operating in the opposite limit. We then explore what states, operations, and measurements would be required for a network to only be limited by the transducers. For the doubly parametric transducer's two-mode Gaussian channel, we conjecture that this requires access to optical non-Gaussian resources in order for the network to never be separable across the microwave domains.

(Session 5 : Thursday from 5:00 pm - 7:00 pm)