Research
Superconducting qubits and circuit QED
Our group focuses on the study of quantum effects in superconducting circuits comprising qubits and resonators. This is a remarkably versatile experimental platform, allowing us to dive into fundamental physical phenomena and, in the long term, aiming at applications such as quantum computers and simulators.
Some of our topics of interest:
- Quantum state control of superconducting qubits using microwave pulses. See the trajectories on the Bloch sphere shown above; a movie is available here<https://ltl.tkk.fi/wiki/images/0/02/Trajectories.ogv>
- Entanglement and dissipation
- Frequency modulation effects with superconducting qubits
- Parametric modulation of superconducting circuits and the dynamical Casimir effect
- Architectures for quantum computing and quantum simulation
Microwave photonics
The high-frequency measurement techniques for the work on superconducting circuits can be employed in other contexts as well. Novel materials have recently been fabricated using nanotechnology. Our goal is to understand how these new types of materials, placed in cavities or in transmission lines, interact with microwave fields.
Some of our topics of interest:
- Novel methods for extracting the microwave permittivity and permeability using coaxial air lines
- Carbon nanotubes in electromagnetic cavities
Quantum coherent matter
We are interested in phenomena related to tunnelling in Bose-Einstein condensates, and the properties of the phase of the order parameter. We have been investigating many-body fragmented states realized with bosonic atoms in double-well traps as well as Josephson effects in fermionic gases.