Coplanar waveguide resonators for circuit quantum electrodynamics Journal Article

Author(s): Göppl, M; Fragner, A; Baur, Matthias P; Bianchetti, R; Filipp, Stefan; Fink, Johannes; Leek, Peter J; Puebla, G; Steffen, L. Kraig; Wallraff, Andreas
Article Title: Coplanar waveguide resonators for circuit quantum electrodynamics
Abstract: High quality on-chip microwave resonators have recently found prominent new applications in quantum optics and quantum information processing experiments with superconducting electronic circuits, a field now known as circuit quantum electrodynamics (QED). They are also used as single photon detectors and parametric amplifiers. Here we analyze the physical properties of coplanar waveguide resonators and their relation to the materials properties for use in circuit QED. We have designed and fabricated resonators with fundamental frequencies from 2 to 9 GHz and quality factors ranging from a few hundreds to a several hundred thousands controlled by appropriately designed input and output coupling capacitors. The microwave transmission spectra measured at temperatures of 20 mK are shown to be in good agreement with theoretical lumped element and distributed element transmission matrix models. In particular, the experimentally determined resonance frequencies, quality factors, and insertion losses are fully and consistently explained by the two models for all measured devices. The high level of control and flexibility in design renders these resonators ideal for storing and manipulating quantum electromagnetic fields in integrated superconducting electronic circuits.
Keywords: QUANTUM ELECTRODYNAMICS; QUANTUM THEORY; Electric Conductivity; quantum information processing; Electric fields; Electromagnetic fields; Resonance; Superconductivity; Input and outputs; Quantum optics; Quantum electronics; Parametric amplifiers; Electrodynamics; Single photons; Resonators; Particle beams; Microwave resonators; Microwave devices; Bandpass filters; Coplanar waveguides; Electron tubes; Materials properties; Microwave amplifiers; Natural frequencies; Parametric devices; Q factor measurement; Waveguides; Coplanar waveguide resonators; Distributed elements; Electronic circuits; Fundamental frequencies; Lumped elements; Microwave transmissions; Quality factors; Quantum electromagnetic fields; Resonance frequencies; Transmission matrixes
Journal Title: Journal of Applied Physics
Volume: 104
Issue 11
ISSN: 10897550
Publisher: American Institute of Physics  
Date Published: 2008-01-01
Start Page: Article number 113904
Sponsor: This work was supported by Swiss National Fund (SNF) and ETH Zürich. P.J.L. was supported by the EC with a MC-EIF
DOI: 10.1063/1.3010859
Open access: yes (repository)