Fabrication and characterization of superconducting circuit QED devices for quantum computation

By Luigi Frunzio, A. Wallraff, David Schuster, Johannes Majer, Robert J. Schoelkopf. IEEE transactions on applied superconductivity, 2004

195 citations recorded by the source corpus.

We present fabrication and characterization procedures of devices for circuit quantum electrodynamics (cQED). We have made 3-GHz cavities with quality factors in the range 10/sup 4/-10/sup 6/, which allow access to the strong coupling regime of cQED. The cavities are transmission line resonators made by photolithography. They are coupled to the input and output ports via gap capacitors. An Al-based Cooper pair box is made by e-beam lithography and Dolan bridge double-angle evaporation in superconducting resonators with high quality factor. An important issue is to characterize the quality factor of the resonators. We present an RF-characterization of superconducting resonators as a function of temperature and magnetic field. We have realized different versions of the system with different box-cavity couplings by using different dielectrics and by changing the box geometry. Moreover, the cQED approach can be used as a diagnostic tool of qubit internal losses.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/8dfa15950b79a2989b5ad3291b06519df3c7bf12

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Citations in the corpus

Microwave photonics with superconducting quantum circuits (2017, unknown): “the form of coplanar waveguides (CPWs) [5, 119, 120].”
High-Coherence Fluxonium Qubit (2018, methodology): “The devices are fabricated in a single step using the fourdecade-old Dolan bridge technique [33,34].”
Measuring nanomechanical motion with a microwave cavity interferometer (2008, methodology): “This method avoids the problematic aspects of magnetomotive driving such as large currents in the beam and applied magnetic fields that are incompatible with high- Q superconducting cavitie”
A coherent all-electrical interface between polar molecules and mesoscopic superconducting resonators (2006, background): “High- Q resonators (internal Q values of 10 6 have been demonstrated”
Low-Disorder Microwave Cavity Lattices for Quantum Simulation with Photons (2012, background): “For a single resonator, Lk typically only results in a small shift in ωr [24, 25].”