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 dwell into fundamental physical phenomena, and, in the long term, aiming at applications such as quantum computers and simulators.

400px-Bloch_sphere_CNOT.JPGphotons_entangled_web.pdf

Some of our topics of interest are summarized below:

  • Quantum state control of superconducting qubits using microwave pulses. See for example the trajectories on the Bloch sphere shown above; a movie is available here
  • Entanglement and dissipation
  • Frequency modulation effects with superconducting qubits
  • Parametric modulation of superconducting circuits and the dynamical Casimir efffect
  • Architectures for quantum computing and quantum simulation

Microwave photonics

The high-frequency measurement techniques we are using for the work on superconducting circuits can be employed in other contexts as well. Novel materials have been fabricated in recent times 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 are summarized below:

  • Novel methods for extracting the microwave permittivity and permeability using coaxial airlines
  • Carbon nanotubes in electromagnetic cavities

Quantum coherent matter

We are interested in phenomena related to tunneling 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.

 

Page content by: communications-phys [at] aalto [dot] fi (Department of Physics) | Last updated: 03.02.2016.