Marco Paradina

Engineering multi-photon dissipation with a dc-voltage-biased Josephson junction

  1. Marco Paradina,
  2. Ambroise Peugeot,
  3. Roberto Negrin,
  4. Oscar Novat,
  5. Tristan Villain,
  6. Anil Murani,
  7. Jean-Loup Ville,
  8. Sébastien Jezouin,
  9. Raphaël Lescanne,
  10. Audrey Bienfait,
  11. and Benjamin Huard
Multi-photon dissipation — a key resource for bosonic qubits — is usually realized by parametrically pumping a Josephson coupler at the cost of spurious nonlinear terms.
Here we instead engineer it using a dc-voltage-biased SQUID, such that these parasitic terms average out. We activate the conversion of one, two, or four photons of a high-Q mode into a single photon of a lossy mode. We characterize the two-photon dissipation by Wigner tomography, establishing dc-biased junctions as a resource for reservoir engineering and a viable route to cat-qubit stabilization.
arxiv pdf