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Título: | Bound states in the continuum in a fluxonium qutrit |
Autor: | Hita-Pérez, María CSIC ORCID; Orellana, Pedro A.; García-Ripoll, Juan José CSIC ORCID ; Pino, Manuel CSIC ORCID | Fecha de publicación: | 5-dic-2022 | Editor: | American Physical Society | Citación: | Physical Review A 106: 062602 (2022) | Resumen: | Heavy fluxonium at zero external flux has a long-lived state when coupled capacitively to any other system. We analyze it by projecting all the fluxonium-relevant operators into the qutrit subspace, as this long-lived configuration corresponds to the second excited fluxonium level. This state becomes a bound state in the continuum (BIC) when the coupling occurs to an extended system supporting a continuum of modes. In the case without noise, we find BIC lifetimes T_1 that can be much larger than seconds when the fluxonium is coupled to a superconducting waveguide, while typical device frequencies are on the order of gigahertz. We have performed a detailed study of the different sources of decoherence in a realistic experiment, finding that upwards transitions caused by a finite temperature in the waveguide and decay induced by 1/f flux noise are the most dangerous ones. Even in their presence, BIC decay times could reach the range of T_1~10^{¿1} ms, while preparation times are of the order of 10^2 ns. | Descripción: | 11 pags., 8 figs., 1 tab. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevA.106.062602 | URI: | http://hdl.handle.net/10261/285666 | DOI: | 10.1103/PhysRevA.106.062602 | Identificadores: | doi: 10.1103/PhysRevA.106.062602 issn: 2469-9934 |
Aparece en las colecciones: | (CFMAC-IFF) Artículos |
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Bound states.pdf | 821,23 kB | Adobe PDF | Visualizar/Abrir |
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