A. N. Bolgar

Evolution of coherent waves driving a single artificial atom

  1. A. V. Vasenin,
  2. Sh. V. Kadyrmetov,
  3. A. N. Bolgar,
  4. A.Yu. Dmitriev,
  5. and O. V. Astafiev
An electromagnetic wave propagating through a waveguide with a strongly coupled superconducting artificial two-level atom exhibits an evolving superposition with the atom. The Rabi
oscillations in the atom result from a single excitation-relaxation, corresponding to photon absorption and stimulated emission from/to the field. In this study, we investigate the time-dependent behavior of the transmitted field and extract its spectra. The scattered fields are described using input-output theory. We demonstrate that the time evolution of the propagating fields, due to interaction, encapsulates all information about the atom. Additionally, we deduce the dynamics of the incoherent radiation component from the measured first-order correlation function of the field.
arxiv pdf

Experimental demonstration of a two-dimensional phonon cavity in the quantum regime

  1. A. N. Bolgar,
  2. J. I. Zotova,
  3. D. D. Kirichenko,
  4. I. S. Besedin,
  5. A. V. Semenov,
  6. R. S. Shaikhaidarov,
  7. and O. V. Astafiev
The quantum regime in acoustic systems is a focus of recent fundamental research in the new field of Quantum Acoustodynamics (QAD). Systems based on surface acoustic waves having an
advantage of easy integration in two-dimensions are particularly promising for the demonstration of novel effects in QAD and development of novel devices of quantum acousto-electronics. We demonstrate the vacuum mode of the surface acoustic wave resonator by coupling it to a superconducting artificial atom. The artificial atom is implemented into the resonator formed by two Brag mirrors. The results are consistent with expectations supported by the system model and our calculations. This work opens the way to map analogues of quantum optical effects into acoustic systems.
arxiv pdf