Bence Hetényi


Department of Physics
University of Basel
Klingelbergstrasse 82
CH-4056 Basel, Switzerland

email:view address


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


Show all abstracts.

1.  Hyperfine-assisted decoherence of a phosphorus nuclear-spin 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 quantum-information experiments. It has been proposed that this nuclear-spin qubit can be efficiently controlled by an ac electric field, when embedded in a two-electron dot-donor setup subject to intrinsic or artificial spin-orbit 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 nuclear-spin qubit. We identify a promising parameter range where the electrical single-qubit 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 nuclear-spin resonance.