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We demonstrate a deterministic shift in phase of an input single photon by a negatively charged quantum dot in a low Q-factor, high output efficiency micropillar cavity, with values up to 2π/3.
Semiconductor quantum dots are often proposed as an ideal means to achieve non-linear interactions and photon switching in semiconductor integrated circuits. We examine here the use of the electron spin degree of freedom as a means to achieve a controllable quantum switching of single photons and trains of photons. We examine some types of spin-based quantum switches, and the design principles upon...
Quantum dots (QDs) can be incorporated into solid state photonic devices such as cavities or waveguides that enhance the light-matter interaction. A near unit efficiency light-matter interaction is essential for deterministic, scalable quantum information devices [1]. In this limit, a single photon input into the device will undergo a large rotation of the polarization of the light field due to the...
Photonic crystal waveguides can support polarisation singularities, which are predicted to be useful in future quantum information applications. For example, C-points possess local chirality, allowing spin-photon entanglement when a quantum dot is placed at its location. Photonic crystal waveguides also support slow-light modes, and we have studied the enhancement of this coupling in the slow-light...
We report the measurement of macroscopic phase shifts of several degrees for reflected incident light resonant with a bright negatively charged quantum dot (QD) in a micropillar structure of Q-factor less than 200.
The effects of short range disorder on the polarization characteristics of light in W1 photonic crystal waveguides were simulated. It was found that points of local circular polarization (C-points) were robust in both quantity and location.
We study the polarisation structure of the electromagnetic fields in the vicinity of a photonic crystal waveguide, and demonstrate that polarisation singularities are supported. Further, we study the effects of disorder and find that the polarisation singularities persist far beyond expected levels of disorder in a real waveguide, making them suitable for applications. Finally we discuss applications...
The first solid state structures for cavity quantum electrodynamic studies were realized analog to established designs from the field of trapped atom or ions: Single emitters (e.g. semiconductor quantum dots) were place in optical resonators with small mode volumes and a large quality factors. These devices have allowed the demonstration of effects that were already observed for atom/ion systems,...
Semiconductor and plasmonic nanostructures have attracted considerable attention during the last decade. Semiconductors are the basis of today's information technology because of the possibility of tailoring electrical and optical properties on a detailed level. An elementary optical excitation in semiconductors is the electron-hole pair (exciton) with large oscillator strength which potentially enables...
Self-assembled quantum dots (QDs), nanosized semiconductors, are often known as artificial atoms due to their atomic-like spectra. For this reason they have long been proposed as a means to mediate interactions between single photons, a useful capability for photonic quantum information technology. I will describe the role of QDs in the latest developments in photonic quantum information technology...
We demonstrate a photonic crystal waveguide design that supports polarisation singularities — positions in the electric field vector where one of the parameters describing the local polarisation ellipse is singular. We show how these singularities can be used to transfer quantum information between the spin states of an electron in a quantum dot and the path of a photon in the photonic crystal waveguide.
We have developed an optical switch with a quantum dot in a high Q-factor microcavity. Experimental reflectivity spectroscopy fitted by a semi-analytical model estimates the intracavity photon number required to switch the device as 0.13.
We show the importance of polarization and phase engineering when designing quantum information devices. Using the example of a photonic-crystal waveguide we demonstrate, for the first time, designs for an integrated quantum dot spin-photon interface.
We present in this paper fabrication, simulation and measurement of low refractive index micropilar/microcavity structures where the optical properties are retrieved by white light Fourier image spectroscopy [1]. We aim to show with these results that organic micropillars and low refractive index cavities in 3D photonic crystals could be a suitable platform for organic based emitting devices. We also...
Quantum dot (QD) systems containing electron spins may hold a role in a future photonic quantum circuit as a means of storing a quantum state in a spin superposition. In general, the spin superposition state maps directly to a photon emitted out of the plane (kz) with the photon in a polarization superposition. In waveguides, however, this is more difficult: one requires a waveguide mode that is able...
We propose a device architecture for an in-plane network of optically connected quantum dots. At each node of the network, the dot resides at the intersection of two orthogonal waveguides which transmit the full polarization of an emitted photon to another node. A prototype device is presented.
We theoretically study the position and orientation dependent coupling of a quantum dot to an H1 photonic crystal cavity. Several regions of dipole independent coupling are found inside the cavity.
We present a quantum repeater scheme based on a single quantum-dot spin in an optical microcavity. The spin-cavity unit performs deterministic Bell-state analyisis with heralded memory allowing loss free repeater operation.
This paper studies the linear polarization of the emission from single quantum dots (QDs) embedded in an "L3" defect nanocavity in a two-dimensional photonic crystal.
We present the realization of 2-D photonic crystal cavities with a dual L3-defect geometry. The experimental results show consistent and predictable splitting of the fundamental modes and reveal clear evidence for strong cavity-cavity coupling.
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