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Abstract:

Numerical data generated from python module available at DOI:10.5281/zenodo.7020047. Data are presented and analysed in arxiv 2112.05795

Abstract:

We evaluate the exact dipole coupling strength between a single emitter and the radiation field within an optical cavity, taking into account the effects of multilayer dielectric mirrors. Our model allows one to freely vary the resonance frequency of the cavity, the frequency of light or atomic transition addressing it, and the design wavelength of the dielectric mirror. The coupling strength is derived for an open system with unbound frequency modes. For very short cavities, the effective length used to determine their mode volume and the lengths defining their resonances are different, and also found to diverge appreciably from their geometric length, with the radiation field being strongest within the dielectric mirror itself. Only for cavities much longer than their resonant wavelength does the mode volume asymptotically approach that normally assumed from their geometric length.

Abstract:

The author explores how the internet and the new media are changing the way that we communicate, act and think, individually and collectively, through the example of the Occupy Wall Street Movement. The author claims that The Occupy Movement, as a post-narrative project conceived in a digital environment, is less of a political activity, and more a new way of behavior for its members and for the society at large. Its focus on consensus building and its modus operandi are reflecting the principles of the Internet, web-organization and cooperation. Therefore, its success is not about achieving any particular political aim, or winning an election, but about the general acceptance of these values and their becoming part of a wider political agenda.Autor istražuje kako internet i novi mediji menjaju način na koji komuniciramo, delujemo i mislimo, pojedinačno ali i kolektivno, na primeru pokreta „Okupirajmo Volstrit“. Autor tvrdi da „Okupacija Volstrita“, kao postnarativni pokret nastao u digitalnom okruženju, manje predstavlja političku aktivnost a više novi normativni način ponašanja za svoje članove, ali i čitavo društvo. Njegova usmerenost ka izgradnji konsenzusa, kao i sam modus funkcionisanja, odražavaju principe interneta, mrežne organizacije i kolaboracije. Zato je njegov uspeh manje povezan sa ostvarivanjem nekog pojedinačnog cilja ili osvajanja vlasti na izborima, a više sa razmerom u kojoj će ove rednosti biti opšteusvojene i postati deo ukupne političke agende

Abstract:

A leading strategy for the creation of a scalable quantum computer is through a networked architecture. This would comprise stationary nodes for quantum information processing and photonic channels for their communication and entanglement distribution. In this scheme a coherent interface between light and matter is a critical component, facilitating the deterministic and reversible transfer of quantum information between stationary and travelling qubits. This requirement may be fulfilled by a high finesse optical cavity, whose radiation field is strongly coupled to a trapped quantised emitter. Neutral atoms are an ideal species for the development of such a device, given their inherent compatibility with dielectric mirror surfaces. However, an outstanding challenge in building an elementary network of neutral atom-cavity systems is in establishing a single atom dipole trap within each cavity mode. This thesis presents the development of an open-access cavity suitable for single atom localisation, whilst maintaining strong atom-cavity coupling, {g0,κ,γ} = {11,2.1,3} × 2πMHz, and the efficient extraction of generated photons, η=0.5. We consider cavity design methodology, deriving a connection between the physical properties of the optical resonator and its intended role in the production of single photons. An experimental platform is developed for the creation of cavity mirrors by laser ablation, with a high degree of geometrical control. This is used to produce a set of pyramidal micro-mirrors, demonstrated to represent a favourable alternative to the widespread adoption of fibre-tip cavities. These pyramidal mirrors are shown to 91̽�� multi-feature resonators, allowing several atom-cavity interfaces to be formed using a pair of substrates. By developing a novel procedure for mirror alignment, a hybrid mirror cavity is fabricated and integrated into an experimental architecture tailored for atomic trapping. Suitability of the cavity for future experimentation is demonstrated by frequency stabilisation to an atomic resonance of ⁸⁷Rb.