Online Seminar: Prof Dieter Suter, TU Dortmund U. DEU
Efficient control and protection against environmental noise
Hybrid Quantum Registers
SPEAKER: Professor Dieter Suter
AFFILIATION: TU Dortmund University, Germany
HOSTED BY: Dr Clara Javaherian, UTS Centre for Quantum Software and Information
ABSTRACT:
Nuclear and electronic spins are attractive objects not only for spectroscopic studies, but also for emergent technologies like quantum information processing and sensing. The combination of different types of qubits allows one to take advantage of the favourable properties of each type. Examples include the nitrogen-vacancy (NV) center in diamond, where the electron spin interacts with 14N and 13C nuclear spins, or Si vacancies in SiC. One of the challenges for controlling hybrid systems is that the speed at which different spin species react to external control operations can differ by many orders of magnitude. It is therefore essential to develop techniques that result in sufficiently fast controls for the nuclear spins, whose gyromagnetic ratio is 3-4 orders of magnitude smaller than that of the electron spin. For this purpose, we have developed indirect control techniques that are based on sequences of microwave pulses applied to the electron spin in such a way that the motion of the electron spin generates a time dependent hyperfine interaction acting on the nuclear spin. Suitable sequences of microwave pulses can thus drive arbitrary evolutions of the nuclear spin, at rates that are far higher than those that can be achieved by radio-frequency pulses. In addition, these sequences can be optimised to protect the electron spin coherence against degradation by environmental noise.
RESEARCH INTERESTS: https://e3.physik.tu-dortmund.de/cms/en/Team-Suter/Research-Interests/index.html
PUBLICATIONS: https://e3.physik.tu-dortmund.de/cms/en/Team-Suter/Publications/index.html