Bence Hetényi
ContactDepartment of PhysicsUniversity of Basel Klingelbergstrasse 82 CH4056 Basel, Switzerland

Short CV
2018—present:  PhD student in the Condensed Matter Theory & Quantum Computing Group at the University of Basel, supervised by Prof. Dr. Jelena Klinovaja and Prof. Dr. Daniel Loss 
2016 — 2018:  MSc in Physics with honours at Eötvös Loránd University Thesis: Quantumbits in silicon nanostructures, supervised by András Pályi 
2012 — 2016: 
BSc in Physics at Eötvös Loránd University Thesis: Optomechanical multistbility in elastic structures, supervised by János Asbóth 
Publications
Show all abstracts.1.  Hyperfineassisted decoherence of a phosphorus nuclearspin qubit in silicon 
Bence Hetényi, Péter Boross, and András Pályi. Phys. Rev. B 100, 115435; arXiv:1903.01102.
The nuclear spin of a phosphorus atom in silicon has been used as a quantum bit in various quantuminformation experiments. It has been proposed that this nuclearspin qubit can be efficiently controlled by an ac electric field, when embedded in a twoelectron dotdonor setup subject to intrinsic or artificial spinorbit interaction. Exposing the qubit to control electric fields in that setup exposes it to electric noise as well. In this work, we describe the effect of electric noise mechanisms, such as phonons and 1/f charge noise, and estimate the corresponding decoherence timescales of the nuclearspin qubit. We identify a promising parameter range where the electrical singlequbit operations are at least an order of magnitude faster then the decoherence. In this regime, decoherence is dominated by dephasing due to 1/f charge noise. Our results facilitate the optimized design of nanostructures to demonstrate electrically driven nuclearspin resonance.
