We discuss a mechanism for generating a maximum entangled state (GHZ) in a coupled quantum dots system, based on analytical techniques. The reliable generation of such states is crucial for implementing solid-state based quantum information schemes. The signature originates from a remarkably weak field pulse or a far off-resonance effects which could be implemented using technology that is curr...

We have achieved low threshold lasing of self-assembled InAs/GaAs quantum dots coupled to the evanescent wave of the high-Q whispering gallery modes of a silica microsphere. In spite of high temperature and Q-spoiling of whispering gallery modes due to diffusion and refraction on the high index semiconductor sample, room temperature lasing is obtained with less than 100 quantum dots. This resul...

Single electron spins in quantum dots are attractive for quantum communication because of their expected long coherence times. We propose a method to create entanglement between two remote spins based on the coincident detection of two photons emitted by the dots. Local nodes of two or more qubits can be realized using the dipole-dipole interaction between trions in neighboring dots and spectra...

The first far-infrared modulated photoluminescence ~FIRM-PL! measurements in InSb/GaSb quantum dots have been performed. Far-infrared absorption is found to both enhance and suppress the quantum dot PL depending on the FIR intensity. This behavior is attributed to the nonthermal distribution of carriers amongst the quantum dots. The spectral dependence of the FIRM-PL signal measures the energy ...

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Motivated by recent experiments we analyse a new setup of capacitively coupled semiconductor quantum dots. We identify a region where Kondo-assisted tunneling should be observable. We nd an eeective mapping to a single quantum dot with controllable multi-level structure. We study electron transport through strongly coupled quantum dots in the presence of strong Coulomb repulsion and coupling to...

This thesis is concerned with optical manipulation of small particles. This includes dielectric spheres in a standing wave evanescent field and, in particular, quantum dots in the optical trap. The forces acting on the small particles in the optical fields are characterized and quantized. Ultimately to use the particles as force transducers on the pN scale. This is desirable for many biophysica...

We present ground-state calculations for laterally coupled quantum dots containing 2, 4, and 8 electrons. As our emphasis is on spin effects our results are obtained by applying spin-density functional theory (SDFT). By varying the distance between the centers of the coupled quantum dots, the transition from weak to strong coupling situation is realized. For the 2-electron system we also apply ...

A thin quantum well called the wetting layer is created whenever self-assembled quantum dots are fabricated. The wetting layer is highly non-uniform, thereby producing potential uctuations that in uence the physics of the quantum dots. Here, we report several e ects that are caused by such uctuations. In particular, light-induced spectral di usion on a very long time scale and interdot excitati...

We demonstrate the feasibility of fabrication of semiconducting nanowires (quantum dots) using F-actin as a template. Three different approaches of assembling quantum dots into nanowires are described. The nanowires were characterized by fluorescence microscopy.