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Control for quantum technologies at the nanoscale

Abstract : Controlling quantum emitters (atoms, molecules, quantum dots, etc.), light, and its interactions is a key issue for implementing all-optical devices and information processing at the quantum level. This generally necessitates a strong coupling of emitters to photonic modes, as achieved by a high-Q cavity, for efficient manipulation of the atoms and field dynamics through cavity quantum electrodynamics (cQED). The integration of the principles of quantum optics at the nanoscale in a plasmonic platform has been envisioned, on the basis of a possible strong coupling between a quantum emitter and the surface plasmon polaritons (SPPs) via their strong mode confinement. Recent progress showed the possibility to reach such a strong coupling regime, allowing the development of quantum plasmonics where a SPP mode takes the role of the cavity mode. However, its application appears notoriously limited in practical situations due to the intrinsic presence of numerous and lossy modes, which complicates the description and the interpretation of the interaction, and introduces strong decoherence in the system, in particular for strong coupling. In this work, a detailed overview of quantum control applied to ion trapping, cQED, and plasmonics, is presented. The first part of the thesis is a study of adiabatic processes in trapped ion systems and cQED: - We summarize quantum computation processes using quantum gates, and control using adiabatic laser pulses with atomic systems. - We design arbitrary quantum gates with ions manipulated with laser pulses. - Models for cQED are derived and applied for the production of photon states leaking from a cavity. In the second part, we develop a formalism to describe the quantum dynamics of emitters close to nanoscale structures, and numerics showing the strong coupling regime and the coupling of emitters via plasmon modes. More specifically: - We provide a general field quantization procedure for spherically layered systems. - Effective models using the field quantization are derived, and we show they are analogous to cQED models. - We describe the interaction of localized plasmons (LSPs) with quantum emitters. - The coupling/entanglement of emitters by adiabatic passage through lossy plasmonic modes of a nanosphere is shown.
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  • HAL Id : tel-02537382, version 1

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Benjamin Rousseaux. Control for quantum technologies at the nanoscale. Physics [physics]. Université de Bourgogne Franche-Comté, 2016. English. ⟨tel-02537382⟩

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