2019/03/04 by Bence Hetényi, Péter Boross, András Pályi · 5 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Charge qubit #Computer science #Condensed matter physics #Dephasing #Electron #Hyperfine structure #Noise (video) #Phase qubit #Physics #Quantum #Quantum and electron transport phenomena #Quantum computer #Quantum decoherence #Quantum mechanics #Qubit #Semiconductor materials and devices #Spin (aerodynamics) #Spin engineering #Spin polarization #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.100.115435
published in Physical review. B./Physical review. B 100(11) (American Physical Society) · 11 pages, 5 figures
arxiv created 2019/03/04 · openalex created_date 2019/03/11 · openalex publication_date 2019/09/27 · arxiv updated 2019/10/02 · openalex updated_date 2026/08/05
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.