Landau–Zener transitions in coupled qubits: Effects of coloured noise
| Autor: | J.T. Diffo, M.E. Ateuafack, Lukong Cornelius Fai, I.F. Nyisomeh |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Quantum decoherence Semiclassical physics Perturbation (astronomy) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials symbols.namesake Gaussian noise Qubit Quantum mechanics 0103 physical sciences symbols Zener diode 010306 general physics 0210 nano-technology Adiabatic process Quantum |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 116:113744 |
| ISSN: | 1386-9477 |
| DOI: | 10.1016/j.physe.2019.113744 |
| Popis: | The feasibility of stochastic Hamiltonians for interacting qubits to deliver consistent quantum speedups in quantum adiabatic optimisation remains an open question. This paper studies theoretically the noisy Landau–Zener model of a system of two interacting qubits. Exact analytic results are obtained for all transition probabilities via nonstationary perturbation technique, even where semiclassical trajectories interfere. Where the system is driven by slow classical Gaussian noise, destructive interference of the trajectories results in forbidden transitions. However, in the fast noise regime, these transitions have non-zero probabilities. We elucidate the roles of noise parameters on the decoherence of coupled qubits. |
| Databáze: | OpenAIRE |
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