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Dissertations / Theses on the topic 'Molecular qubit'

Author: Grafiati
Published: 10 March 2023
Last updated: 31 July 2025

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1

Hakimi, Shirin. "Theory and Modeling of Electrical Control of Chiral Qubit in Spin-Frustrated Molecular Triangle." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-84587.

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Spin-frustrated molecular triangles have four low-lying energy states, so called chiral states, which can be employed as the unit of information, qubit, in a quantum computer. The fact that the chiral states are characterized by two quantum numbers chirality and spin allows the control of the magnetization of the molecule by an electric field due to the spin-electric interaction. Unlike a magnetic field, electric fields can be applied spatially and temporally on the scale of single molecules, as an electric impulse by using a scanning tunneling microscope (STM) tip. In this thesis, I report on, i
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2

Navickas, Tomas. "Towards high-fidelity microwave driven multi-qubit gates on microfabricated surface ion traps." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/79060/.

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3

Leslie, Nathaniel. "Maximal LELM Distinguishability of Qubit and Qutrit Bell States using Projective and Non-Projective Measurements." Scholarship @ Claremont, 2017. http://scholarship.claremont.edu/hmc_theses/108.

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Many quantum information tasks require measurements to distinguish between different quantum-mechanically entangled states (Bell states) of a particle pair. In practice, measurements are often limited to linear evolution and local measurement (LELM) of the particles. We investigate LELM distinguishability of the Bell states of two qubits (two-state particles) and qutrits (three-state particles), via standard projective measurement and via generalized measurement, which allows detection channels beyond the number of orthogonal single-particle states. Projective LELM can only distinguish 3 of 4
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4

Plant, Simon Richard. "Molecular engineering with endohedral fullerenes : towards solid-state molecular qubits." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:84f12a03-5b1d-4e04-82d5-5b28ca92e56c.

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Information processors that harness quantum mechanics may be able to outperform their classical counterparts at certain tasks. Quantum information processing (QIP) can utilize the quantum mechanical phenomenon of entanglement to implement quantum algorithms. Endohedral fullerenes, where atoms, ions or clusters are trapped in a carbon cage, are a class of nanomaterials that show great promise as the basis for a solid-state QIP architecture. Some endohedral fullerenes are spin–active, and offer the potential to encode information in their spin-states. This thesis addresses the challenges of how
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5

Brown, Richard Matthew. "Coherent transfer between electron and nuclear spin qubits and their decoherence properties." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:21e043b7-3b72-44d7-8095-74308a6827dd.

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Conventional computing faces a huge technical challenge as traditional transistors will soon reach their size limitations. This will halt progress in reaching faster processing speeds and to overcome this problem, require an entirely new approach. Quantum computing (QC) is a natural solution offering a route to miniaturisation by, for example, storing information in electron or nuclear spin states, whilst harnessing the power of quantum physics to perform certain calculations exponentially faster than its classical counterpart. However, QCs face many difficulties, such as, protecting the quantum-
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6

Godfrin, Clément. "Quantum information processing using a molecular magnet single nuclear spin qudit." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY015/document.

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La physique quantique appliquée à la théorie de l’information se révèle être pleine de promesses pour notre société. Conscients de ce potentiel, des groupes de scientifiques du monde entier ont pour objectif commun de créer un ordinateur utilisant les principes de la mécanique quantique. La premières étape de cet ambitieux cheminement menant à l’ordinateur quantique est la réalisation du bloc de base de l’encodage quantique de l’information, le qubit. Dans le large choix de qubits existants, ceux utilisant un spin sont très attrayants puisqu’ilspeuvent être lus et manipulés de façon cohérente
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7

Krajňák, Tomáš. "Depozice velkých organických molekul v UHV." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402579.

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In this thesis, large organic molecules (DM15N, DM18N, Cu(dbm)2) were deposited. These molecules are cannot be deposited by thermal sublimation due the fact that they decompose at lower temperature than they sublime. The employed molecules to single molecular magnets, which can be potentially used as quantum bites (qubit). The new method of deposition atomic layer injection made by Bihur Crystal company was introduced and tested. The method uses liquid solution with molecules which is driven by argon gas through pulse valve to the sample placed in ultra-high vacuum chamber. During the depositi
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8

Amoza, Dávila Martín. "Anisotropía Magnética en Imanes Moleculares y Qubits con Complejos Metálicos de Espín ½." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667860.

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Esta tesis presenta una serie de estudios computacionales basados en métodos de estructura electrónica en los que se analizan la anisotropía magnética y las propiedades derivadas de esta en complejos magnéticos candidatos a imán molecular y bit cuántico con la particularidad de tener un espín total S = ½. En los primeros tres capítulos de esta tesis se estudian complejos de metales de transición. Por otro lado, el cuarto y último capítulo se centra en analizar complejos de lantánidos, concretamente de YbIII. En el primer capítulo se incluye un trabajo a través del cual se relaciona la configu
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9

Rolon, Soto Juan Enrique. "Coherent Exciton Phenomena in Quantum Dot Molecules." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314742055.

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10

Dhungana, Daya Sagar. "Growth of InAs and Bi1-xSBx nanowires on silicon for nanoelectronics and topological qubits by molecular beam epitaxy." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30150/document.

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Grâce à leur propriétés uniques, les nanofils d'InAs et de Bi1-xSbx sont important pour les domaines de la nanoélectronique et de l'informatique quantique. Alors que la mobilité électronique de l'InAs est intéressante pour les nanoélectroniques; l'aspect isolant topologique du Bi1-xSbx peut être utilisé pour la réalisation de Qubits basés sur les fermions de Majorana. Dans les deux cas, l'amélioration de la qualité du matériau est obligatoire et ceci est l'objectif principal cette thèse ou` nous étudions l'intégration des nanofils InAs sur silicium (compatibles CMOS) et où nous développons un
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11

Tuorila, J. (Jani). "Spectroscopy of artificial atoms and molecules." Doctoral thesis, Oulun yliopisto, 2010. http://urn.fi/urn:isbn:9789514262135.

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Abstract Elementary experiments of atomic physics and quantum optics can be reproduced on a circuit board using elements built of superconducting materials. Such systems can show discrete energy levels similar to those of atoms. With respect to their natural cousins, the enhanced controllability of these ‘artificial atoms’ allows the testing of the laws of physics in a novel range of parameters. Also, the study of such systems is important for their proposed use as the quantum bits (qubits) of the foreseen quantum computer. In this thesis, we have studied an artificial atom coupled with a har
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12

Smith, Kellen. "Adiabatisk genväg till quditberäkning." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447704.

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One of the major challenges hindering advancement of quantum computing is the sensitive nature of the physical systems used to build a quantum computer. One suggestion for improving reliability is a particular type of logic gates, based on Berry's geometric phase, showing improved robustness to external disturbance of the quantum system over the course of a calculation. Such logic gates have previously been shown for the smallest possible two-level qubits. Using the method of adiabatic shortcut we endevour to discover similarly realistic and robust logic gates for units of quantum information
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13

BENCI, STEFANO. "Enhancing the performance of potential molecular Qubits: insight into the phonons involved in the spin-lattice relaxation." Doctoral thesis, 2021. http://hdl.handle.net/2158/1234475.

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The development of quantum mechanics led to the birth of the quantum computing, a new frontier of the computer science which exploits quantum phenomena such as the quantum states superposition and the entanglement to perform computation. The basic element of a quantum computer is the Qubit, a two-level quantum system that can be addressed whether in 0 or 1 , but also in a coherent superposition of these two states. Among the great variety of potential Qubit systems, molecular electron spins show interesting features as the great tunability of the electronic and magnetic properties as well as t
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14

CIMATTI, IRENE. "Magnetic molecules on surfaces: assembling Single Molecule Magnets and molecules with long spin coherence." Doctoral thesis, 2017. http://hdl.handle.net/2158/1085620.

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15

Santanni, Fabio. "Molecular approaches for the optimization of electron spin-based quantum bits and quantum logic gates." Doctoral thesis, 2022. http://hdl.handle.net/2158/1262928.

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This work highlights the different possibilities given by a rational chemical approach to obtain molecular-based quantum bits and quantum logic gates as an appealing and alternative platform for implementing quantum computation. This work resumes the three years of the author's work on this subject, mainly presenting and focusing on experimental results obtained for some new potential hydrogen-free molecular qubits, multi-qubit structures, and state-of-the-art EPR-based (Electron Paramagnetic Resonance) experiments on an archetypical vanadyl-based qubit.
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16

Tesi, Lorenzo. "Multitechnique investigation for rational design of molecular spin qubits." Doctoral thesis, 2019. http://hdl.handle.net/2158/1150777.

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The investigation of the relaxation times of a series of vanadium(IV)-based molecular spin qubits in order to find a correlation to their structural properties. The magnetic system and the lattice structure have been studied by using a multitechnique investigation based on EPR, ac susceptometry, THz spectroscopy and 4D-Inelastic Neutron Scattering. New techniques have been proposed, such as Muon Spin Relaxation spectroscopy, and first preliminary results have been achieved by investigating Dy-based SMMs. A small part of the work is devoted to the characterization of a cobalt(II)-based SMM and
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17

Chang, C. W., and 張哲維. "Study of Control Input/Output Schemes for Qubit in Quantum-Dot-Molecule Registers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/56864847357905314386.

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碩士<br>國立高雄應用科技大學<br>電子與資訊工程研究所碩士班<br>96<br>This work presents the theory of exciton coupling to photons and LO phonons in quantum-dot molecules (QDMs). Resonant-round trips of the exciton between the ground (bright) and excited (dark or bright) states, mediated by the LO-phonon, alter the decay time and yield the Rabi oscillation. Novel schemes for a qubit reading/writing in an exciton-based quantum-dot-molecule (QDM) register are proposed. A bit of quantum information is coded into the superposition (molecule) states of the QDM, based on field-controllable combinations of these states. Popula
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