Abstract We propose an in-situ tunable chiral quantum system, composed of a emitter coupled to waveguide based on the Rice-Mele model (where we alternate both on-site potentials and tunnel couplings between sites in array). Specifically, show that chirality photonic bound state, emerges bandgap waveguide, depends only energy qubit; parameter is easy tune many artificial atoms. In contrast previ...

Colloidal quantum dots offer broad tuning of semiconductor band structure via the quantum size effect. In this paper, we present a detailed investigation on the influence of the thickness of colloidal lead sulfide (PbS) nanocrystals (active layer) to the photovoltaic performance of colloidal quantum dot solar cells. The PbS nanocrystals (QDs) were synthesized in a non-coordinating solvent, 1-oc...

We propose a complete architecture for deterministic generation of entangled multiphoton states. Our approach utilizes periodic driving quantum-dot emitter and an efficient light-matter interface enabled by photonic crystal waveguide. assess the quality states produced from real system including all intrinsic experimental imperfections. Importantly, protocol is robust against nuclear spin bath ...

Nonlinear frequency conversion is ubiquitous in laser engineering and quantum information technology. A long-standing goal photonics to integrate on-chip semiconductor sources with nonlinear optical components. Engineering waveguide lasers spectra that phase-match processes on the same device a formidable challenge. Here, we demonstrate difference-frequency generation an AlGaAs Bragg reflection...

the combined effect of hydrostatic pressure and temperature on correlation energy in a triplet state of two electron spherical quantum dot with square well potential is computed. the result is presented taking gaas dot as an example. our result shows the correlation energies are i)negative in the triplet state contrast to the singlet state ii) it increases with increase in pressure  iii)further...

We demonstrate multiwavelength channel optical logic operations on the Bloch vector of a quantum two-level system in the structured electromagnetic vacuum of a bimodal photonic crystal waveguide. This arises through a bichromatic strong-coupling effect that enables unprecedented control over single quantum-dot (QD) excitation through two beams of ultrashort femtojoule pulses. The second driving...

We report a waveguide photodetector utilizing a hybrid waveguide structure consisting of AlGaInAs quantum wells bonded to a silicon waveguide. The light in the hybrid waveguide is absorbed by the AlGaInAs quantum wells under reverse bias. The photodetector has a fiber coupled responsivity of 0.31 A/W with an internal quantum efficiency of 90 % over the 1.5 mum wavelength range. This photodetect...

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Commercially available CdSe/ZnS and PbSe colloidal semiconductor quantum dots were employed to produce both an electron beam sensitive poly methyl methacrylate PMMA -quantum-dot QD positive composite via a prepolymerization processing and an electron beam and ultraviolet UV light sensitive SU-8-QD negative composite via a direct dispersion procedure. Compared to the QDs in the original colloida...