On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics

• URL: http://arxiv.org/abs/2203.01430v2
• Date: Thu, 13 Oct 2022 20:45:26 GMT
• Title: On-Demand Directional Microwave Photon Emission Using Waveguide Quantum Electrodynamics
• Authors: Bharath Kannan, Aziza Almanakly, Youngkyu Sung, Agustin Di Paolo, David A. Rower, Jochen Braum\"uller, Alexander Melville, Bethany M. Niedzielski, Amir Karamlou, Kyle Serniak, Antti Veps\"al\"ainen, Mollie E. Schwartz, Jonilyn L. Yoder, Roni Winik, Joel I-Jan Wang, Terry P. Orlando, Simon Gustavsson, Jeffrey A. Grover, William D. Oliver
• Abstract summary: 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. This circuit will also be capable of photon absorption, making it suitable for building interconnects within quantum networks.
• Score: 38.42250061908039
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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