Atomistic electronic structure calculations are performed to study the coherent inter-dot couplings of the electronic states in a single InGaAs quantum dot molecule. The experimentally observed excitonic spectrum by Krenner et al (2005) Phys. Rev. Lett. 94 057402 is quantitatively reproduced, and the correct energy states are identified based on a previously validated atomistic tight binding mo...

Information in a quantum cellular automata architecture is encoded in the polarization state of a cell, i.e. in the occupation numbers of the quantum dots of which the cell is made up. Non-invasive charge detectors of single electrons in a quantum dot are therefore needed, and recent experiments have shown that a quantum constriction electrostatically coupled to the quantum dot may be a viable ...

This thesis presents the development of an on-demand source of time-bin entangled photons, created from the biexciton-exciton radiative cascade in a single quantum dot. To achieve a source of time-bin entangled photons, we determined that the quantum dot must have two key properties: a dephasing time that is longer than the lifetime and high count rates, which are necessary to perform the corre...

quantum-dot cellular automata (qca) has low power consumption and high density and regularity. qca widely supports the new devices designed for nanotechnology. application of qca technology as an alternative method for cmos technology on nano-scale shows a promising future. this paper presents successful designing, layout and analysis of multiplexer with a new structure in qca technique. in thi...

the full adders (fas) constitute the essential elements of digital systems, in a sense that they affect the circuit parameters of such systems. with respect to the mosfet restrictions, its replacement by new devices and technologies is inevitable. qca is one of the accomplishments in nanotechnology nominated as the candidate for mosfet replacement. in this article 4 new layouts are presented fo...

The building up of quantum coherence among coupled mesoscopic objects is studied in the present paper with a model of “ideal” quantum dots. With strong Coulomb repulsion we show that quantum coherence between dots can build up at an energy scale much larger than energy-level spacing if the number of electrons per dot is fractional. The self-consistent ladder approximation SCLA is applied to stu...

We report on correlated real-time detection of individual electrons in an InAs nanowire double quantum dot. Two self-aligned quantum point contacts in an underlying two-dimensional electron gas material serve as highly sensitive charge detectors for the double quantum dot. Tunnel processes of individual electrons and all tunnel rates are determined by simultaneous measurements of the correlated...