Engineering Symmetry-Selective Couplings of a Superconducting Artificial Molecule to Microwave Waveguides
Journal article, 2022

Tailoring the decay rate of structured quantum emitters into their environment opens new avenues for nonlinear quantum optics, collective phenomena, and quantum communications. Here, we demonstrate a novel coupling scheme between an artificial molecule comprising two identical, strongly coupled transmon qubits and two microwave waveguides. In our scheme, the coupling is engineered so that transitions between states of the same (opposite) symmetry, with respect to the permutation operator, are predominantly coupled to one (the other) waveguide. The symmetry-based coupling selectivity, as quantified by the ratio of the coupling strengths, exceeds a factor of 30 for both waveguides in our device. In addition, we implement a Raman process activated by simultaneously driving both waveguides, and show that it can be used to coherently couple states of different symmetry in the single-excitation manifold of the molecule. Using that process, we implement frequency conversion across the waveguides, mediated by the molecule, with efficiency of about 95%. Finally, we show that this coupling arrangement makes it possible to straightforwardly generate spatially separated Bell states propagating across the waveguides. We envisage further applications to quantum thermodynamics, microwave photodetection, and photon-photon gates.

Author

Aamir Ali

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Claudia Castillo-Moreno

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Simon Sundelin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Janka Biznárová

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Marco Scigliuzzo

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Kowshik Erappaji Patel

Student at Chalmers

Amr Osman

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Daniel Perez Lozano

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Ingrid Strandberg

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Simone Gasparinetti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 129 12 123604

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PhysRevLett.129.123604

PubMed

36179204

More information

Latest update

9/13/2024