Semiconducting double-dot exchange-only qubit dynamics in the presence of magnetic and charge noises
| Autor: | M. De Michielis, Marco Fanciulli, Elena Ferraro |
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| Rok vydání: | 2018 |
| Předmět: |
Coherence time
FOS: Physical sciences 02 engineering and technology Electron 01 natural sciences 7. Clean energy Theoretical Computer Science symbols.namesake Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Electrical and Electronic Engineering 010306 general physics Quantum computer Physics Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Spins Quantum dots Statistical and Nonlinear Physics 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Magnetic field Quantum dot Modeling and Simulation Qubit Qubit architectures Signal Processing symbols Quantum Physics (quant-ph) Noise 0210 nano-technology Hamiltonian (quantum mechanics) |
| Zdroj: | Quantum information processing 17 (2018). doi:10.1007/s11128-018-1896-8 info:cnr-pdr/source/autori:Ferraro, E.; Fanciulli, M.; De Michielis, M./titolo:Semiconducting double-dot exchange-only qubit dynamics in the presence of magnetic and charge noises/doi:10.1007%2Fs11128-018-1896-8/rivista:Quantum information processing (Print)/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume:17 Quantum Information Processing |
| ISSN: | 1573-1332 1570-0755 |
| Popis: | The effects of magnetic and charge noises on the dynamical evolution of the double-dot exchange-only qubit (DEOQ) is theoretically investigated. The DEOQ consisting of three electrons arranged in an electrostatically defined double quantum dot deserves special interest in quantum computation applications due to its advantages in terms of fabrication, control and manipulation in view of implementation of fast single and two qubit operations through only electrical tuning. The presence of the environmental noise due to nuclear spins and charge traps, in addition to fluctuations in the applied magnetic field and charge fluctuations on the electrostatic gates adopted to confine the electrons, is taken into account including random magnetic field and random coupling terms in the Hamiltonian. The behavior of the return probability as a function of time for initial conditions of interest is presented. Moreover, through an envelope-fitting procedure on the return probabilities, coherence times are extracted when model parameters take values achievable experimentally in semiconducting devices. 16 pages, 11 figures; accepted for publication on Quantum Information Processing |
| Databáze: | OpenAIRE |
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