Cáceres Ramírez, Joan J. (2022) Qubit protegido contra errores y compuertas cuánticas rápidas basadas en la transición Landau-Zener-Stuckelberg / Error-protected qubits and fast quantum gates based on the Landau-Zener-Stuckelberg. Maestría en Ciencias Físicas, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En los últimos años se han desarrollado grandes avances en el campo de la computación cuántica, permitiendo la realización de algoritmos cuánticos con un número cada vez mayor de qubits y tiempos de operación más largos. Esto se ha logrado gracias a mejoras en la coherencia de los qubits y de las puertas cuánticas que se utilizan para manipularlos. En esta tesis se proponen y estudian alternativas orientadas a optimizar la coherencia tanto de los qubits como de las puertas cuánticas. En la primera parte de esta tesis se propone un nuevo tipo de qubit superconductor, llamado qubit fermiónico-bosónico, que presenta una protección simultánea contra los dos canales de ruido de los qubits gracias a su diseño de parámetros. Nuestra simulación indica que este qubit puede alcanzar un tiempo de coherencia de aproximadamente 10 ms, lo que es un orden de magnitud más alto que los valores actuales de los qubits superconductores. A partir de una reciente propuesta de puerta rápida de un qubit basada en las transiciones Landau-Zener-Stuckelberg (LZS) se estudiaron los efectos de la disipación, lo que permitió determinar el punto ´optimo en términos de coherencia de la puerta. Finalmente, se propone una puerta rápida de dos qubits basada en las transiciones LZS y se estudian los efectos de disipación para determinar el punto de optimización de la coherencia de la puerta.
Resumen en inglés
In recent years, great advances have been made in the area of quantum computing, allowing quantum algorithms to be carried out with an increasing number of qubits and longer operating times. This has been possible due to, among many things, advances in improving the coherence of qubits and the quantum gates with which they are manipulated. In this thesis, alternatives aimed at optimizing the coherence of both qubits and quantum gates are proposed and studied. In the first part of this thesis we propose a new superconducting qubit, called fermionic-bosonic qubit, which due to the design of its parameters presents a simultaneous protection against the two noise channels of the qubits. Our simulation indicates that this qubit can achieve a coherence time T∗2 ≈ 10 ms, which is an order of magnitude above the values of state-of-the-art superconducting qubits. Subsequently, to a recent proposal for a fast one-qubit gate based on Landau-Zener-Stuckelberg (LZS) transitions, the dissipation effects were studied, with which we found the point at which the coherence of the gate is optimized. Finally, a fast gate of two qubits based on the LZS transitions is proposed and the dissipation effects are also studied with which we determine the point where the coherence of the gate is optimized.
| Tipo de objeto: | Tesis (Maestría en Ciencias Físicas) |
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| Palabras Clave: | Quantum computers; Ordenadores cuánticos; Qubits; [Quantum gates; Compuertas cuánticas; Landau-Zener-Stuckelberg; Floquet] |
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| Materias: | Física > Información cuántica |
| Divisiones: | Gcia. de área de Investigación y aplicaciones no nucleares > Gcia. de Física > Materia condensada > Teoría de sólidos |
| Código ID: | 1147 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 11 Abr 2023 15:24 |
| Última Modificación: | 12 Jul 2023 10:58 |
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