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CNAA / Theses / 2018 / June /

The dynamic of nanomechanical resonator coupled with a coherent light pumped quantum dot


Author: Cârlig Sergiu
Degree:doctor of Physics
Speciality: 01.04.02 - Theoretical and mathematical physics
Year:2018
Scientific advisers: Mihail Macovei
doctor habilitat, professor
Valeriu Canţer (decedat)
doctor habilitat, professor, Institute of the Electronic Engineering and Nanotechnologies
Institution: Institute of Applied Physics of the ASM

Status

The thesis was presented on the 29 June, 2018
Approved by NCAA on the 23 November, 2018

Abstract

Adobe PDF document0.62 Mb / in romanian

Thesis

CZU 530.145+535.14

Adobe PDF document 3.27 Mb / in romanian
147 pages


Keywords

nanomechanical resonator, quantum dot, phonon-photon / phonon-phonon quantum correlations, quantum cooling.

Summary

Structure of the thesis: The thesis was elaborated at the Institute of Applied, Chisinau, is written in Romanian and consists of introduction, 3 chapters, general conclusions and recommendations, 163 bibliographic titles, 127 pages of basic text, 26 figures and one table. The results presented in the thesis are published in 12 scientific papers.

Field of study: Quantum Optomecanics. The aim of the thesis: modelling and analysing the interaction quantum properties / quantum effects of mixed systems consisting of nanomechanical resonator, optical resonator and artificial atoms pumped by coherent external radiation.

Objectives of the thesis: • to analyse the interaction between phononic and photonic modes of the system consisting of optical cavity, nanomechanical resonator and the laser pumped qubit. • to detect the quantum cooling effect by detecting the emitted photons into the cavity. • to identify the phenomenon of phonon-phonon correlations amplification in the qubit- nanomechanical resonator system. • to specify different numerical parameters in order to identify the appropriate quantum states for experimental development. Scientific novelty and originality: the first study of the properties of a mixed opto-mechanical system consisting of a nanomechanical resonator and an optical cavity, the interactions between which are mediated by a laser pumped quantum dot.

The solved scientific problem consists in analysing the quantum dynamics of the nanomechanical resonator on which are placed one or more pumped quantum dots intercalated or not in an optical cavity, which led to: 1. photon-phonon quantum correlation attestation; 2. identification of the quantum cooling phenomenon; 3. optical signal amplification via mechanical one, and 4. phonon-phonon correlations identifications in strong coupled qubits and nanomechanical resonator. Theoretical and Applied Significance: in the thesis we present the interaction model between the optical cavity, quantum mechanical resonator and pumped qubit as a mediator. · There are discussed two models made of an optical cavity, nanomechanical resonator, qubit, and nanomechanical resonator and a set of qubits pumped with coherent radiation · The full study of nanomechanical resonator dynamics was carried out and the corresponding approximations of the proposed systems were done. · Some recommendations are made to perform experiments involving similar optomechanical systems to observe the quantum cooling phenomenon, quantum photonphonon correlation, or phonon-phonon correlations for strong qubit-nanomechanical coupling. · It is recommended to include quantum dots in opto-mechanical systems in order to enrich the interaction setup, but also the quantum properties. · The obtained results can be used in the modelling and analysis of the interaction quantum properties / quantum effects of mixed systems consisting of nanomechanical resonator, optical resonator and artificial atoms pumped by coherent external radiation.