A Journey on Quantum Sound: Developing a scalable platform for integrated hybrid quantum systems

Recently, quantum networks have emerged as a focal point of research and discussion due to their promise in overcoming the limitations of classical networks, offering unparalleled capabilities in secure communication, quantum computation, and distributed quantum information processing. Simply speaking, a quantum network is a network in which the...

Quantum communication using phonons: Towards a quantum network using high frequency mechanical oscillators

Quantum communication refers to the field of science that studies the ability to connect separated quantum devices via coherent channels, i.e. via buses that maintain coherently the information encoded. The importance of the task is on multiple levels: from secure communications to scaling quantum computers. The first one can be of fundamental...

Dynamical behavior of trampoline membranes

This thesis comprises several experiments involving silicon nitride trampoline membranes. These membranes are excellent mechanical resonators and can be fabricated with desirable optical properties. Their dynamical behavior, particularly the interaction of their mechanical motion with light, is of interest for optomechanics and sensing...

Bringing classical mechanical resonators towards the quantum regime: A journey on developing integrated optomechanical devices and exploring experiments at high temperature

The work in this thesis focuses on potential ways to bring a macroscopic mechanical<br/>resonator in a classical environment into the quantum regime with integrated cavity<br/>optomechanics...

Coupling Harmonic Oscillators to Superconducting Quantum Interference Cavities

This thesis explores the coupling of microwave cavities containing a Superconducting QUantum Interference Device (SQUID) to a mechanical resonator by means of a flux-mediated optomechanical coupling scheme, and to a Radio-Frequency (RF) circuit via a photon-pressure interaction. While flux-mediated optomechanical systems open the door for the...

Building Blocks for Wavelength Converters: A Study of Monolithic Devices in Piezoelectric Materials

In cavity optomechanics, optical fields are coupled to the displacement of mechanical resonators. While it is interesting to study fundamental aspects of this interaction, it is the ability to link this mechanical displacement to various other degrees of freedom that inspires many applications in the field. In these applications, the mechanical...

Nanofabricated tips for device-based and double-tip scanning tunneling microscopy

Towards an Optomechanical Quantum Memory: Preparation and Storage of Non-Classical States in High-Frequency Mechanical Resonators

Cavity Optomechanics is a field employing optical control over mechanical oscillators with a variety of possible applications for sensing, optical signal processing as well as quantum technologies. Such systems are attractive because they are often fully engineerable and can be tailored to specific applications by allowing a large range of...

Optomechanical devices in the quantum regime

This thesis explores the possibility of controlling the quantum states of high frequency mechanical resonators using infra-red laser pulses. Chapter 1 gives an overview of quantum technologies based on mechanical resonators relevant for this thesis. Chapter 2 provides the basics of the theoretical background of optomechanics. The Hamiltonian...