Demonstrating a Driven Reset Protocol of a Superconducting Qubit

  1. K. Geerlings,
  2. Z. Leghtas,
  3. I. M. Pop,
  4. S. Shankar,
  5. L. Frunzio,
  6. R. J. Schoelkopf,
  7. M. Mirrahimi,
  8. and M. H. Devoret
Qubit reset is crucial at the start of and during quantum information algorithms. We present the experimental demonstration of a practical method to force qubits into their ground state, based on driving certain qubit and cavity transitions. Our protocol, nicknamed DDROP (Double Drive Reset of Population) is tested on a superconducting transmon qubit in a 3D cavity. Using a new method for measuring population, we show that we can prepare the ground state with a fidelity of at least 99.5 % in less than 3 microseconds; faster times and higher fidelity are predicted upon parameter optimization.
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