On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics
Abstract
Routing quantum information between non-local computational nodes is a foundation for extensible networks of quantum processors. Quantum information transfer between arbitrary nodes is generally mediated either by photons that propagate between them, or by resonantly coupling nearby nodes. The utility is determined by the type of emitter, propagation channel, and receiver. Conventional approaches involving propagating microwave photons have limited fidelity due to photon loss and are often unidirectional, whereas architectures that use direct resonant coupling are bidirectional in principle, but can generally accommodate only a few local nodes. Here we demonstrate high-fidelity, on-demand, directional, microwave photon emission. We do this using an artificial molecule comprising two superconducting qubits strongly coupled to a bidirectional waveguide, effectively creating a chiral microwave waveguide. Quantum interference between the photon emission pathways from the molecule generates single photons that selectively propagate in a chosen direction. This circuit will also be capable of photon absorption, making it suitable for building interconnects within extensible quantum networks.
Cite
@article{arxiv.2203.01430,
title = {On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics},
author = {Bharath Kannan and Aziza Almanakly and Youngkyu Sung and Agustin Di Paolo and David A. Rower and Jochen Braumüller and Alexander Melville and Bethany M. Niedzielski and Amir Karamlou and Kyle Serniak and Antti Vepsäläinen and Mollie E. Schwartz and Jonilyn L. Yoder and Roni Winik and Joel I-Jan Wang and Terry P. Orlando and Simon Gustavsson and Jeffrey A. Grover and William D. Oliver},
journal= {arXiv preprint arXiv:2203.01430},
year = {2023}
}