A5047269803- Photonic and Optical Devices
- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Neural Networks and Reservoir Computing
- Quantum optics and atomic interactions
- Semiconductor Lasers and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Strong Light-Matter Interactions
- Force Microscopy Techniques and Applications
- Plasmonic and Surface Plasmon Research
- Optical Network Technologies
- Semiconductor materials and devices
- Quantum Computing Algorithms and Architecture
- Surface and Thin Film Phenomena
- Optical Coatings and Gratings
- Analytical Chemistry and Sensors
- Diamond and Carbon-based Materials Research
- Acoustic Wave Resonator Technologies
- Magnetic properties of thin films
- Quantum Dots Synthesis And Properties
- Laser-Matter Interactions and Applications
University of Basel
2019-2025
Cleveland State University
2025
University of Copenhagen
2013-2019
Yazd University
2016
Birjand University of Medical Sciences
2016
University of Tabriz
2010-2012
Isfahan University of Medical Sciences
2011
Azerbaijan University
2010
A quantum emitter efficiently coupled to a nanophotonic waveguide constitutes promising system for the realization of single-photon transistors, quantum-logic gates based on giant nonlinearities, and high bit-rate deterministic sources. The key figure merit such devices is $\beta$-factor, which probability an emitted single photon be channeled into desired mode. We report experimental achievement $\beta = 98.43 \pm 0.04\%$ dot photonic-crystal waveguide, corresponding single-emitter...
Strong nonlinear interactions between photons enable logic operations for both classical and quantum-information technology. Unfortunately, are usually feeble therefore all-optical gates tend to be inefficient. A quantum emitter deterministically coupled a propagating mode fundamentally changes the situation, since each photon inevitably interacts with emitter, highly correlated many-photon states may created . Here we show that single dot in photonic-crystal waveguide can utilized as giant...
Quantum dots are both excellent single-photon sources and hosts for single spins. This combination enables the deterministic generation of Raman-photons -- bandwidth-matched to an atomic quantum-memory photon cluster states, a resource in quantum communication measurement-based computing. GaAs AlGaAs can be matched frequency rubidium-based memory, have potentially improved electron spin coherence compared widely used InGaAs dots. However, their charge stability optical linewidths typically...
Planar photonic technology provides a highly promising route of creating an on-chip and on-demand source single photons, which can be scaled into circuitry. While self-assembled quantum dots have been proven to excellent coherent single-photon emitters in many microscale structures, nanoscale devices the photon coherence compromised due nearby surfaces. Here, authors achieve 94% indistinguishability photons emitted from waveguide under $p$-shell excitation.
Abstract The interaction between photons and a single two-level atom constitutes fundamental paradigm in quantum physics. nonlinearity provided by the leads to strong dependence of light–matter interface on number interacting with system within its emission lifetime. This unveils strongly correlated quasiparticles known as photon bound states, giving rise key physical processes such stimulated soliton propagation. Although signatures consistent existence states have been measured Rydberg...
We demonstrate a single-photon collection efficiency of $(44.3\pm2.1)\%$ from quantum dot in low-Q mode photonic-crystal cavity with purity $g^{(2)}(0)=(4\pm5)\%$ recorded above the saturation power. The high is directly confirmed by detecting up to $962\pm46$ kilocounts per second on detector another coupled mode. found be broadband, as explained detailed numerical simulations. Cavity-enhanced efficient excitation dots obtained through phonon-mediated and under these conditions,...
Establishing a highly efficient photon-emitter interface where the intrinsic linewidth broadening is limited solely by spontaneous emission key step in quantum optics. It opens pathway to coherent light-matter interaction for, e.g., generation of indistinguishable photons, few-photon optical nonlinearities, and gates. However, residual mechanisms are ubiquitous need be combated. For solid-state emitters charge nuclear spin noise importance, influence photonic nanostructures on has not been...
Solid-state quantum dots are promising candidates for efficient light-matter interfaces connecting internal spin degrees of freedom to the states emitted photons. However, selection rules prevent combination control and optical cyclicity in this platform. By utilizing a photonic crystal waveguide we here experimentally demonstrate up $\approx15$ through state engineering while achieving high fidelity initialization coherent control. These capabilities pave way towards scalable multi-photon...
With a highly coherent, optically addressable electron spin, the nitrogen vacancy (NV) centre in diamond is promising candidate for node quantum network. However, NV poor source of coherent single photons owing to long radiative lifetime, small branching ratio into zero-phonon line (ZPL) and extraction efficiency out high-index host material. In principle, these three shortcomings can be addressed by resonant coupling mode an optical cavity. Utilising weak-coupling regime cavity...
Rapid, high-fidelity single-shot readout of quantum states is a ubiquitous requirement in information technologies, playing crucial role computation, error correction, and fundamental tests non-locality. Readout the spin state an optically active emitter can be achieved by driving spin-preserving optical transition detecting emitted photons. The speed fidelity this approach typically limited combination low photon collection rates measurement back-action. Here, we demonstrate semiconductor...
A spin-photon interface should operate with both coherent photons and a spin to enable cluster-state generation entanglement distribution. In high-quality devices, self-assembled GaAs quantum dots are near-perfect emitters of on-demand photons. However, the rapidly decoheres via magnetic noise arising from host nuclei. Here, we address this drawback by implementing an all-optical nuclear-spin cooling scheme on dot. The electron-spin coherence time increases 156-fold ${T}_{2}^{*}=3.9\text{...
SUMMARY West Nile virus (WNV) is a mosquito-borne flavivirus which circulates in birds, horses and humans. An estimated 80% of WNV infections are asymptomatic. Fewer than 1% infected persons develop neuroinvasive disease, typically presents as encephalitis, meningitis, or acute flaccid paralysis. This study was conducted from January 2008 to June 2009 Isfahan, Iran. Patients attending the emergency department with fever loss consciousness were consecutively included. Cerebrospinal fluids...
We demonstrate full charge control, narrow optical linewidths, and spin pumping on single self-assembled InGaAs quantum dots embedded in a $162.5\,\text{nm}$ thin diode structure. The are just $88\,\text{nm}$ from the top GaAs surface. design realize p-i-n-i-n that allows single-electron charging of at close-to-zero applied bias. In operation, current flow through device is extremely small resulting low noise. resonance fluorescence, we measure linewidths below $2\,\mu\text{eV}$, factor two...
We present experiments in which self-assembled InAs quantum dots are coupled to a thin, suspended-beam GaAs resonator. The driven resonantly and the resonance fluorescence is detected. narrow dot linewidths, just factor of 3 larger than transform limit, result high sensitivity mechanical motion. show that one couples eight modes spanning frequency range from 30 600 MHz: provides an extensive characterization coupling spans unresolved-sideband resolved-sideband regimes. Finally, we first...
The article uses theory and qualitative evidence to show how youth participatory action research (YPAR) can advance educational equity. YPAR engages young people adult allies in on issues their schools communities. Interviews with over two dozen researchers-students partner teachers-elaborate the mechanisms through which school-based affect equity, including direct changes policy practice as a result of actions, school culture that values student experiences, transformative teacher-student...
The realization and control of collective effects in quantum emitter ensembles have predominantly focused on small, ordered systems, leaving their extension to larger, more complex configurations as a significant challenge. Quantum photonic platforms, with engineered Green's functions integration advanced solid-state emitters, provide opportunities explore new regimes light-matter interaction beyond the scope atomic systems. In this study, we examine emitters embedded within thin dielectric...
Planar photonic nanostructures have recently attracted a great deal of attention for quantum optics applications. In this paper, we carry out full 3D numerical simulations to fully account all radiation channels and thereby quantify the coupling efficiency emitter embedded in photonic-crystal waveguide. We determine leakage from surrounding environment study its spectral spatial dependence. The maps efficiency, β factor, reveal that even moderately slow light, near-unity factor is achievable...
We study both theoretically and experimentally the effects of introducing deliberate disorder in a slow-light photonic crystal waveguide on photon density states. introduce theoretical model that includes through statistically moving hole centers lattice intrinsic caused by fabrication imperfections. demonstrate disorder-induced mean blueshift an overall broadening states for values ranging 0--12 nm. By comparing with measurements obtained from GaAs waveguide, we find very good agreement...
Precise control of the properties semiconductor quantum dots (QDs) is vital for creating novel devices photonics and advanced opto-electronics. Suitable low QD-densities single QD experiments are challenging to during epitaxy typically found only in limited regions wafer. Here, we demonstrate how conventional molecular beam (MBE) can be used modulate density optically active QDs one- two- dimensional patterns, while still retaining excellent quality. We find that material thickness gradients...