V. S. Shumeiko

Quantum acousto-optic transducer for superconducting qubits

  1. V. S. Shumeiko
We propose theory for reversible quantum transducer connecting superconducting qubits and optical photons using acoustic waves in piezoelectrics. The proposed device consists of integrated
acousto-optic resonator that utilizes stimulated Brillouin scattering for phonon-photon conversion, and piezoelectric e?ect for coupling of phonons to qubits. We evaluate the phonon-photon coupling rate, and show that the required power of optical pump as well as the other device parameters providing full and faithful quantum conversion are feasible for implementation with the state of the art integrated acousto-optics.
arxiv pdf

Circuit Quantum Electrodynamics with a Superconducting Quantum Point Contact

  1. G. Romero,
  2. I. Lizuain,
  3. V. S. Shumeiko,
  4. E. Solano,
  5. and F. S. Bergeret
We consider a superconducting quantum point contact in a circuit quantum electrodynamics setup. We study three different configurations, attainable with current technology, where a
quantum point contact is coupled galvanically to a coplanar waveguide resonator. Furthermore, we demonstrate that the strong and ultrastrong coupling regimes can be achieved with realistic parameters, allowing the coherent exchange between a superconducting quantum point contact and a quantized intracavity field.
arxiv pdf