Bruno, Alessandro (2011) TECHNOLOGICAL ASPECTS OF QUANTUM DECOHERENCE IN SUPERCONDUCTING JOSEPHSON QUBITS. [Tesi di dottorato] (Unpublished)

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Item Type: Tesi di dottorato
Language: English
Title: TECHNOLOGICAL ASPECTS OF QUANTUM DECOHERENCE IN SUPERCONDUCTING JOSEPHSON QUBITS
Creators:
CreatorsEmail
Bruno, Alessandroalessandrobr1@gmail.com
Date: 30 November 2011
Number of Pages: 213
Institution: Università degli Studi di Napoli Federico II
Department: Scienze fisiche
Doctoral School: Ingegneria industriale
PHD name: Tecnologie innovative per materiali, sensori ed imaging
PHD cycle: 24
PHD Coordinator:
nameemail
Andreone, Antonelloandreone@unina.it
Tutor:
nameemail
Lisistskiy, Mikhailm.lisitskiy@cib.na.cnr.it
Cristiano, Robertor.cristiano@cib,.na.cnr.it
Date: 30 November 2011
Number of Pages: 213
Uncontrolled Keywords: Qubits, superconducting resonators, Josephson junctions
MIUR S.S.D.: Area 02 - Scienze fisiche > FIS/03 - Fisica della materia
Date Deposited: 12 Dec 2011 12:27
Last Modified: 30 Apr 2014 19:49
URI: http://www.fedoa.unina.it/id/eprint/8997

Abstract

The aim of this thesis was to realize superconducting quantum bits by using novel fabrication techniques and materials in order to enhance the coherence time of the former devices. For the system to be studied we chose the ux-biased phase qubit, which consists of a Josephson junction integrated in a superconducting loop. This qubit realization has some advantages, which make it an ideal test-bed for different fabrication technologies and materials. Relatively large Josephson junctions can be used in the phase qubit realization, which are easy to be fabricated by using standard lithographic technology with the flexibility of employing various fabrication techniques and materials. The coherence of current-generation of superconducting qubits seems to be limited by intrinsic sources of noise and energy loss, related to materials' defects (two-level systems, TLSs) on the surfaces and interfaces of the superconducting lms, and in the bulk of the dielectric films used for the microelectronic realization of the circuits. For this reason, we aimed our research activities on the realization of low loss dielectrics (a-Si:H), on its integration with Josephson junction technologies, on the protection of the superconducting films' surfaces from unwanted contamination, and on the optimization of the circuit design and fabrication processes.

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