University of Waterloo
200 University Avenue West
Waterloo, Ontario, Canada N2L 3G1
Phone: (519) 888-4567 ext 32215
Fax: (519) 746-8115
Dr. Kycia's group works on the experimental investigation of superconducting and quantum mechanical devices; in particular Superconducting Quantum Interference Devices (SQUIDs) and GaAs quantum dots (Spin Qubits). The experiments are run at ultra low temperatures (down to 0.004K). With these low temperatures, the quantum aspects of devices can be isolated and sensors can have the lowest levels of noise. These devices are used for quantum computing applications as well as for studying novel magnetic and superconducting materials.
In order to make high performance qubits and sensors, the superconductor-based Josephson junctions and semiconductor-based quantum dot devices need to be optimized. My group works with other groups such as NRC:Ottawa and D-wave Inc. to develop improved devices. My group works on cryogenic electronic measurements. More specifically:
My group is responsible for characterizing the low frequency noise (1/f noise) and the sub gap leakage currents in Josephson junctions produced be the quantum computer manufacturer, D-wave Inc. . We are in the feedback loop for developing improved devices that are needed to produce higher performance quantum computers. This work involves cooling samples to typically 10-100 mK temperature and characterising the device performance. These characteristics are then correlated to manufacturing and processing parameters. 1/f noise can occur from single atom defects moving within the quantum tunnel junction. Sub-gap leakage can be caused by tiny pinholes in the insulating tunnel barriers. A third characterization we are working on with D-wave is the rf characterization of dielectric losses at cryogenic temperatures. Often high-quality factor, Q, resonators are desired for sensors and qubits. Defects in the dielectrics can absorb energy (similar to water in a microwave oven). We work on identifying and reducing these unwanted loss mechanisms in the devices. The better the junctions and devices get, the more challenging it becomes to detect the noise mechanisms. The field is pushing to work at lower and lower temperatures to reduce noise and decoherence mechanisms also working on larger scale circuits. We are working on new characterization configurations that are suited for lower temperatures and provide higher throughput.
My group is working on semiconductor-based qubits and sensors. These typically isolate a single (or a few) electron(s) or hole(s) in a nanoscale electronic device. With nano-scaled gates, we can set potential wells to localize these charges. These devices can be used to make extremely sensitive electric field sensors, they can also create qubits. One push is to improve the coherence time by identifying and minimizing decoherence sources. One such source is the interaction of the charge/spin with the nuclei in the substrate. New substrates are being developed to avoid this interaction. My group is working with a group at NRC:Ottawa (Sergei Studenikin) as well as local researchers at Waterloo (Jonathan Baugh, Zbig Wasilewski, and Francois Sfigakis) to develop improved devices. My group’s specialty in this collaboration is in the cryogenic rf-electronics measurements. We are characterizing the devices made with new materials and developing higher-sensitivity, higher-speed readout measurements. With higher speeds and higher sensitivity, we can reveal new physics at play in the devices. One goal is to reach the quantum noise limit and study quantum noise effects. With an improved readout, the performance of the qubits is improved.
H. M. Revell, L. R. Yaraskavitch, J. D. Mason, K. A. Ross, H. M. L. Noad, H. A. Dabkowska, B. D. Gaulin, P. Henelius & J. B. Kycia
Evidence of impurity and boundary effects on magnetic monopole dynamics in spin ice
Nature Physics 85, doi:10.1038/nphys2466 (2012)
D. Pomaranski, and J. B. Kycia
Low Temperature Specific Heat Measurements of Frustrated Magnetic Materials
Physics in Canada 68, No. 2: 99-102 (2012)
L. R. Yaraskavitch, H. M. Revell, S. Meng, K. A. Ross, H. M. L. Noad, H. A. Dabkowska, B. D. Gaulin, and J. B. Kycia
Spin dynamics in the frozen state of the dipolar spin ice material Dy2Ti2O7
Phys. Rev. B 85, Issue 18, 020410(R) (2012)
J. A. Quilliam, S. Meng, C. G. A. Mugford, and J. B. Kycia
Evidence of Spin Glass Dynamics in Dilute LiHoxY1-xF4
Phys. Rev. Lett. 101, Issue 18, 187204 (2008)
Please see Google Scholar for a complete list of Dr. Kycia's publications.
1997: PhD, Physics, Northwestern University
1991: MSc, Physics University of Pennsylvania
1989: BSc, Physics, McGill University
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Office of Indigenous Relations.