Speaker 1: Kamil Taziev (PhD-4)

Title: Matrix formalism method for modeling and fitting the resonance splitting in the spectra of single-mode ring resonators

Abstract: Ring resonators still remain one of the most important elements of integrated photonics and are widely used as optical filters, sensors, modulators, etc. Their spectra are represented by the series of resonances having the Lorentz function form. However, if the reflection inside the ring resonator is strong, this may result in resonance splitting which can seriously hamper the usage of such ring resonators. In order to qualitatively and quantitatively model the spectra of ring resonators with splitting and to fit the experimental spectra the method of matrix formalism was developed. In the current talk the matrix formalism method will be described in detail, and the usage of this method will be demonstrated for modeling and fitting the spectra of single-mode silicon microring resonators fabricated at the Skoltech’s Laboratory of Plasmonics.

Bio: Kamil Taziev is the 4-th year PhD student of Skoltech. Kamil graduated from Lomonosov Moscow State University in 2020 with the qualification of “Chemist. Lecturer in Chemistry” in the field of Fundamental and Applied Chemistry. In the same year he applied to Skoltech to Physics program and started working in the Laboratory of Plasmonics. In the Plasmonics Lab he is developing and fabricating various integrated photonic circuits for biosensor and other applications.

Speaker 2: Andrei Vasenin (PhD-3)

Title: Quantum optics experiments with a single superconducting artificial atom

Abstract: Making artificial atoms using superconductors seemed impossible in the 1990s. Today, such atoms are at the forefront, competing for a leading position among various quantum computing platforms. Additionally, one can engineer almost any kind of artificial atom with the required coupling to the electromagnetic environment, which is advantageous for quantum optics. For example, strong coupling of an atom to a propagating wave, a challenge with natural atoms, has allowed us to efficiently observe the interaction processes of a single artificial atom with a propagating electromagnetic wave in the time-domain. A significant hurdle in the microwave region is the lack of efficient single photon detectors. In another experiment, we mixed coherent light with quantum light using a superconducting artificial atom. This approach could lead to a new technique for inferring the photon statistics of incident microwave quantum light from the resulting scattering spectrum. These experiments are intended to foster intuition for potential quantum applications of superconducting quantum devices.

Bio: Andrei Vasenin is a third-year PhD student at Skoltech. His research is conducted at the Moscow Institute of Physics and Technology (MIPT) in the Laboratory of Artificial Quantum Systems, under the supervision of Professor Oleg Astafiev. His work focuses on quantum optics experiments using superconducting quantum devices.