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Beyond Markovian dissipation at the nanoscale : towards finding quantum design rules for bio-organic nanodevices
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dc.contributor.advisor | Lovett, Brendon W. | |
dc.contributor.advisor | Chin, Alex | |
dc.contributor.author | Lacroix, Thibaut | |
dc.coverage.spatial | 131 | en_US |
dc.date.accessioned | 2023-07-07T15:57:17Z | |
dc.date.available | 2023-07-07T15:57:17Z | |
dc.date.issued | 2023-11-29 | |
dc.identifier.uri | https://hdl.handle.net/10023/27918 | |
dc.description.abstract | A better understanding of dissipation is crucial for understanding real-world quantum systems. Indeed, all quantum systems experience interactions with an (often) uncontrollable outside environment that can lead to a decay of excited state populations and a loss of quantum coherences. The study of dissipation is timely as the development of next-generation nanoscale quantum technologies is on its way, and the existence of non-trivial quantum effects in biological systems is being seriously investigated. However, descriptions of dissipation in quantum systems are reduced (most of the time) to time-local approaches and (everywhere) to space-local independent environments. These simplifying assumptions do render analytic and numerical calculations possible, yet they get rid of a breadth of physical processes that can alter radically the quantum systems' dynamics. In this thesis, building on a numerically exact tensor networks method, we developed a technique able to handle spatio-temporal correlations between a quantum system and bosonic (i.e. vibrational, electromagnetic, magnons, etc.) environments. With this method we studied the signalling process - a form of information backflow - in quantum systems, and uncovered how it can induce non-trivial dynamics, and be leveraged to populate otherwise inaccessible excited states. We also evidenced the ability of 'non-local' environment reorganisation, induced by system-environment interactions, to radically change the nature of the thermodynamically favoured system ground state. The new phenomenology of physical processes, resulting from considering quantum systems interacting with a common environment, has important consequences for the design of nanodevices as it gives access to new control, sensing and cross-talk mechanisms. In another vein, these results might also give us a new framework to study and interpret (quantum?) effects in the biological realm. | en_US |
dc.language.iso | en | en_US |
dc.publisher | University of St Andrews | |
dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International | en |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-sa/4.0/ | |
dc.subject | Quantum physics | en_US |
dc.subject | Open systems | en_US |
dc.subject | Tensor networks | en_US |
dc.subject | Non-Markovian | en_US |
dc.subject | Nanosciences | en_US |
dc.subject.lcc | QC174.85O6L2 | |
dc.subject.lcsh | Open systems (Physics) | en |
dc.subject.lcsh | Quantum theory | en |
dc.subject.lcsh | Nanoscience | en |
dc.title | Beyond Markovian dissipation at the nanoscale : towards finding quantum design rules for bio-organic nanodevices | en_US |
dc.title.alternative | Au delà de la dissipation markovienne à l’échelle nanométrique : vers la découverte de règles quantiques pour la conception de nano-dispositifs bio-organiques | en_US |
dc.type | Thesis | en_US |
dc.contributor.sponsor | Defence Science and Technology Laboratory (Great Britain) | en_US |
dc.contributor.sponsor | France. Direction générale de l'armement (DGA) | en_US |
dc.contributor.sponsor | University of St Andrews. School of Physics and Astronomy | en_US |
dc.type.qualificationlevel | Doctoral | en_US |
dc.type.qualificationname | PhD Doctor of Philosophy | en_US |
dc.publisher.institution | The University of St Andrews | en_US |
dc.publisher.department | Sorbonne Université | en_US |
dc.identifier.doi | https://doi.org/10.17630/sta/540 |
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