Maximizing hole coherence in ultrafast photoionization of argon with an optimization by sequential parametrization update
| Autor: | Christiane P. Koch, Antonia Karamatskou, R. Esteban Goetz, Robin Santra, Maximilian Merkel |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Quantum optimal control Argon Attosecond chemistry.chemical_element 02 engineering and technology Degree of coherence Photoionization 021001 nanoscience & nanotechnology 01 natural sciences chemistry 0103 physical sciences Physics::Atomic and Molecular Clusters ddc:530 Atomic physics 010306 general physics 0210 nano-technology Spectroscopy Ultrashort pulse Coherence (physics) |
| Zdroj: | Physical review / A 94(2), 023420 (2016). doi:10.1103/PhysRevA.94.023420 |
| DOI: | 10.1103/PhysRevA.94.023420 |
| Popis: | Photoionization with attosecond pulses populates hole states in the photoion. Superpositions of hole states represent ideal candidates for time-dependent spectroscopy, for example via pump-probe studies. The challenge consists in identifying pulses that create coherent superpositions of hole states while satisfying practical constraints. Here, we employ quantum optimal control to maximize the degree of coherence between these hole states. To this end, we introduce a derivative-free optimization method with sequential parametrization update (SPA optimization). We demonstrate the versatility and computational efficiency of SPA optimization for photoionization in argon by maximizing the coherence between the $3s$ and $3{p}_{0}$ hole states using shaped attosecond pulses. We show that it is possible to maximize the hole coherence while simultaneously prescribing the ratio of the final hole state populations. |
| Databáze: | OpenAIRE |
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