Gleb Fedorov

Control and readout of a transmon using a compact superconducting resonator

  1. Julia Zotova,
  2. Shtefan Sanduleanu,
  3. Gleb Fedorov,
  4. Rui Wang,
  5. Jaw-Shen Tsai,
  6. and Oleg Astafiev
We demonstrate control and readout of a superconducting artificial atom based on a transmon qubit using a compact lumped-element resonator. The resonator consists of a parallel-plate
capacitor (PPC) with a wire geometric inductor. The footprint of the resonators is about 200 {\mu}m by 200 {\mu}m, which is similar to the standard transmon size and one or two orders of magnitude more compact in the occupied area comparing to coplanar waveguide resonators. We observe coherent Rabi oscillations and obtain time-domain properties of the transmon. The work opens a door to miniaturize essential components of superconducting circuits and to further scaling up quantum systems with superconducting transmons.
arxiv pdf

Kinemon: inductively shunted transmon artificial atom

  1. Daria Kalacheva,
  2. Gleb Fedorov,
  3. Julia Zotova,
  4. Shamil Kadyrmetov,
  5. Alexey Kirkovskii,
  6. Aleksei Dmitriev,
  7. and Oleg Astafiev
We experimentally investigate inductively shunted transmon-type artificial atoms as an alternative to address the challenges of low anharmonicity and the need for strong charge dispersion
in superconducting quantum systems. We characterize several devices with varying geometries and parameters (Josephson energies and capacitances), and find a good agreement with calculations. Our approach allows us to retain the benefits of transmon qubit engineering and fabrication technology and high coherence, while potentially increasing anharmonicity. The approach offers an alternative platform for the development of scalable multi-qubit systems in quantum computing.
arxiv pdf