Characterizing losses in InAs two-dimensional electron gas-based gatemon qubits

  1. William M. Strickland,
  2. Jaewoo Lee,
  3. Lukas Baker,
  4. Krishna Dindial,
  5. Bassel Heiba Elfeky,
  6. Mehdi Hatefipour,
  7. Peng Yu,
  8. Ido Levy,
  9. Vladimir E. Manucharyan,
  10. and Javad Shabani
The tunnelling of cooper pairs across a Josephson junction (JJ) allow for the nonlinear inductance necessary to construct superconducting qubits, amplifiers, and various other quantum circuits. An alternative approach using hybrid superconductor-semiconductor JJs can enable a superconducting qubit architecture with full electric field control. Here we present continuous-wave and time-domain characterization of gatemon qubits based on an InAs 2DEG. We show that the qubit undergoes a vacuum Rabi splitting with a readout cavity and we drive coherent Rabi oscillations between the qubit ground and first excited states. We measure qubit coherence times to be T1= 100 ns over a 1.5 GHz tunable band. While various loss mechanisms are present in III-V gatemon circuits we detail future directions in enhancing the coherence times of qubit devices on this platform.
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