Author: Hanno S. KauppPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Coupling Nitrogen-vacancy Centers in Diamond to Fiber-based Fabry-Pérot Microcavities
In Situ Characterization of Fabry-Pérot Microcavities for Coupling to NV Centres in Diamond
Author: Cesar Daniel Rodriguez RosenbluethPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"The nitrogen-vacancy (NV) centre in diamond is one of the most prominent diamond defect centres studied for quantum information applications. The NV centre’s long coherence times and atom-like spin-optical properties have made it one of the possible candidates for a node in a quantum network. Recent achievements include their use as a ten qubit solid-state quantum register, and the first loophole-free Bell experiment separated at km-scale distances. However, current implementations of the NV centre in cavity quantum electrodynamic (cQED) protocols are restricted due to its low emission rate (3%) into its coherent zero-phonon line (ZPL) transition as well as spectral diffusion originating from electric field noise on nearby surfaces. Coupling NV centres in diamond membranes to open Fabry-Pérot fibre microcavities offers one possible solution by enhancing the emission rate into the (ZPL) without degrading the NV centre’s optical properties.The work in this thesis is concerned with the in-situ characterization of the Fabry-Pérot cavities. By adequately characterizing the membrane-in-cavity system in situ, we hope to pave the way to maximize the achievable enhancement of the zero-phonon line emission rate of an NV centre inside the cavity. We study analytical and numerical models for the membrane-in-cavity system and analyze their regime of validity. By combining these models with transmission and reflection characterization of the system we determine the diamond thickness and length of the cavity with a resolution of 100 nm. The cavity finesse ranges between 16000 to 26000, depending on the presence of the diamond membrane and mirror termination. Finally, we expand upon the previously presented models to include surface losses and achieve a method to measure (sub-nm-rms) surface roughness and (ppm) mirror losses by measuring the cavity linewidth as a function of wavelength"--
Fabrication and Characterization of Nitrogen Vacancy Centers in Diamond Membranes for Use in Fabry-Perot Microcavities
Author: Andrew DimockPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"The nitrogen vacancy (NV) center in diamond has attracted considerable attention because its electronic states combine long spin coherence times with atomic-like optical transitions in a solid-state environment. The NV- center emission consists of a coherent zero-phonon line (ZPL) transition which makes up only 4% of the total emission at cryogenic temperatures. Even with weak emission into the ZPL, the NV center has been used successfully in many groundbreaking experiments ranging from multi-qubit quantum registers to a loophole free validation of Bell's inequality. Nevertheless, the weak ZPL greatly reduces the efficiency of protocols relying on coherent photon emission, and spectral diffusion from uncontrolled local environments exacerbates the problem. The majority of the work done for this thesis was to develop a repeatable and reliable process ow - starting from a commercially available bulk diamond sample - for fabricating and characterizing individually addressable NV centers in thin diamond membranes. Such thin membranes can be incorporated into Fabry-Pérot optical cavities to enhance the relative ZPL emission. Fabry-Pérot cavities allow for the location of maximal electric field within the cavity to be overlapped with an NV center. Maximum enhancement of the ZPL is achieved if the ZPL linewidth is well within the width of the cavity mode and if the location. First, an introduction to the NV center electronic structure at room temperature and cryogenic temperatures is given. An overview of the experimental apparatus is detailed in the second chapter, followed by the ion implantation and electron irradiation process flows used for fabricating thin diamond membranes with high quality NV centers. The methods used to characterize the NV center density and measure the ZPL linewidths are outlined and the two fabrication procedures are compared with experimental data. Ion implantation membranes resulted in dense samples (0.85 NV/um^2) with linewidths averaging 450 MHz whereas the electron irradiated membranes resulted in isolated NV centers (0.05 NV/um^2) with linewidths averaging 300 MHz. This is the first demonstration of optically stable transitions in thin diamond membranes. The final chapter covers various methods for characterizing the mechanical properties of the fiber cavity mounts. Although not the ultimate fiber mount that will be used, the measurements provide insight into the motion in the cryostat and will be useful for future systems." --
Coupling of a Single Nitrogen-vacancy Center in Diamond to a Fiber-based Microcavity
Author: Roland AlbrechtCoupling of a Single Nitrogen-vacancy Center in Diamond to a Fiber-based Microcavity
Author: Roland AlbrechtCoupling of Single Nitrogen-vacancy Defect Centers in Diamond Nanocrystals to Optical Antennas and Photonic Crystal Cavities
Author: Exploring the World with the Laser
Author: Dieter MeschedePublisher: Springer
ISBN: 3319643460
Category : Science
Languages : en
Pages : 799
Book Description
This edition contains carefully selected contributions by leading scientists in high-resolution laser spectroscopy, quantum optics and laser physics. Emphasis is given to ultrafast laser phenomena, implementations of frequency combs, precision spectroscopy and high resolution metrology. Furthermore, applications of the fundamentals of quantum mechanics are widely covered. This book is dedicated to Nobel prize winner Theodor W. Hänsch on the occasion of his 75th birthday. The contributions are reprinted from a topical collection published in Applied Physics B, 2016. Selected contributions are available open access under a CC BY 4.0 license via link.springer.com. Please see the copyright page for further details.
The Coupling of Nitrogen-Vacancy Centres in Diamond to Tunable Open-microcavities
Author: Sam JohnsonDiamond Processing for Advanced Photonic Devices
Author: Hangyu LiuPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Diamond photonic devices are critical components for applications including diamond based optics, diamond Raman lasers and the building blocks of quantum information processing. In this thesis work, to achieve such novel diamond photonic devices, micro-fabrication techniques for diamond have been further developed.For making diamond optical structures such as diamond micro-lenses, the fabrication involves the definition of photoresist (PR) masks on the surface of diamond by using photolithography and the pattern transfer by using inductively coupled plasma (ICP) etching. A detailed study of the PR thermal reflow process has been carried out to control the shape of PR masks and the resulting diamond structures with spherical or aspheric features after pattern transfer. By combining PR mask shape control with the optimisation of ICP diamond etching, novel micro-lenses on single crystal diamond have been realised. In particular, diamond micro-lenses with radii of curvature larger than 13 mm have been fabricated. Based on these diamond micro-lenses, novel monolithic diamond Raman lasers were achieved.Furthermore, by using Ar/Cl2 plasma etching, a large area ultra-thin single crystal diamond membrane with a thickness less than 250 nm has been produced. By coupling the diamond membrane within an open optical Fabry-Perot cavity, the enhanced emission from the nitrogen vacancy (NV) colour centre in diamond was investigated. This approach is attractive for the scalable development of quantum computing based on diamond NV centres.
Fabrication and Characterization of Single-crystal Diamond Photonic Cavities
Author: Jonathan LeePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Cavity quantum electrodynamics provide a platform to form a quantum network which connects individual quantum bits (qubits) via photon. Optical cavity, a device which traps photons in a confined volume can enhance the interaction between photons and the qubits serves as fundamental building block for a quantum network. Nitrogen vacancy (NV) centers in diamond has emerged as one of the leading solid-state qubits because of its long spin coherence time and single photon emission properties at room temperature. Diamond optical micro-cavities are highly sought after for coupling with NV centers. Fabrication of optical cavities from nano-crystalline diamond film has been demonstrated previously. The quality factor (Q) of such devices was limited by the material properties of the nano-crystalline diamond film. Fabrication of single-crystal diamond photonic cavities is challenging because there is no trivial way to form thin diamond film with optical isolation. In this thesis, we describe an approach to fabricate high quality single-crystal diamond optical cavities for coupling to NV centers in diamond.