We demonstrate a coherent spin shuttle through GaAs/AlGaAs quadruple-quantum-dot array. Starting with two electrons in spin-singlet state the first dot, we one electron over to either second, third or fourth dot. observe that separated evolves periodically into $m=0$ spin-triplet and back before it dephases due nuclear noise. attribute time evolution differences local Zeeman splitting between respective dots. With help of numerical simulations, analyse discuss visibility singlet-triplet...

Semiconductor quantum dot arrays defined electrostatically in a 2D electron gas provide scalable platform for information processing and simulations. For the operation of arrays, appropriate voltages need to be applied gate electrodes that define potential landscape. Tuning has proven time-consuming task, because initial electrostatic disorder capacitive cross-talk effects. Here, we report on automated tuning inter-dot tunnel coupling gate-defined semiconductor double dots. The automation is...

Abstract Electrostatically defined quantum dot arrays offer a compelling platform for computation and simulation. However, tuning up such with existing techniques becomes impractical when going beyond handful of dots. Here, we present method systematically adding dots to an array one at time, in way that the number electrons on previously formed is unaffected. The allows individual control each dots, as well interdot tunnel rates. We use this technique tune linear eight GaAs they are...

Abstract Gate-defined quantum dots (QDs) are such a highly-tunable system in which single spins can be electrically coupled, manipulated, and measured. However, the gate-defined QDs lacking its interface to free-space photons. Here, we verify that circularly-polarized photon excite electron spin via transfer of angular momentum, measured using Pauli blockade (PSB) double QD. We monitor inter-dot charge tunneling only occur when photo-electron one QD is anti-parallel other. This allows us...

A smart structure was tested for active vibration control of frame structures in which the bending moment columns controlled by stack-type piezoelectric actuators integrated into columns. Excitation tests were carried out a model four-storey building 3.7 m height and 2000 kg total weight thirty-two used control. The installed two ways: one case eight attached to each column first storey, other four second storeys. Two strategies, model-matching method theory, examined structure. showed that...

Abstract Semiconductor quantum dot arrays, a key platform for spin-based computing, 
face scalability challenges due to the time-consuming manual tuning of potential 
landscapes. This paper proposes that combining minimal one-dimensional voltage sweeps 
with machine learning offers practical method automating four separate 
single dots, inspired by Ray-based Classification framework. Our 
successfully tunes single dots in GaAs quadruple device, while...

This study aimed to evaluate the usefulness of light-cured resin coating restoration materials (RCs) on anterior composite blocks by quantifying color, gloss, and surface roughness before after toothbrush abrasion test shear bond strength thermal cycling test. Four types RCs were used in experiments. The application resulted color changes a decrease gloss test; however, both within clinically acceptable limits. was at value that made bacterial adhesion difficult also had strength. Therefore,...

Adiabatic processes can keep the quantum system in its instantaneous eigenstate, which is robust to noises and dissipation. However, it limited by sufficiently slow evolution. Here, we experimentally demonstrate transitionless driving (TLQD) of shortcuts adiabaticity gate-defined semiconductor dots (QDs) greatly accelerate conventional adiabatic passage for first time. For a given efficiency state transfer, acceleration be more than twofold. The dynamic properties also prove that TLQD...

We demonstrate one and two photoelectron trapping the subsequent dynamics associated with interdot transfer in double quantum dots over a time scale much shorter than typical spin lifetime. Identification of is achieved via resonant tunneling photoelectrons excited states. The enables detection single nondestructive manner. When are trapped at almost same we observed that strongly affected by Coulomb interaction between electrons. Finally influence two-electron singlet-triplet state...

We detect in real time inter-dot tunneling events a weakly coupled two electron double quantum dot GaAs. At finite magnetic fields, we observe characteristic times, T_d and T_b, belonging to, respectively, direct blocked (spin-flip-assisted) tunneling. The latter corresponds to lifting of Pauli spin blockade the times ratio eta=T_b/T_d characterizes efficiency. find pronounced changes behavior eta upon increasing field, with increasing, saturating again. explain this as due crossover...

This paper deals with the analytical and experimental studies to clarify impact characteristics, such as force of restitution, impulse, a coefficient restitution contact time, in harmonic resonance nonlinear system collision subjected sinusoidal excitation. The consists an oscillator reflectors at both sides. is modelized two manners. One based on Hertz's theory represents exact relations between characteristics velocity. other described by exponential function convenient analysis periodic...

The wide area ubiquitous network (WAUN), which is used for transmitting and receiving information sensors actuators, proposed the feasibility study of a new wireless WAUN described. designed to satisfy requirements many applications using are wirelessly connected IP network. One basic system coverage larger than several km with low terminal output power 10 mW To meet this requirement, an experimental system, uses powerful FEC diversity technique, use in WAUNs designed, its evaluated by field...

We demonstrate single-shot detection of single electrons generated by photons using an electrically tunable quantum dot and a point contact charge detector. By tuning the in Coulomb blockade before photoexcitation, we observe trapping subsequent resetting photogenerated electrons. The can be stored for time range from shorter to longer than spin-flip T1. combine this trap-reset technique with spin-dependent tunneling under magnetic fields photon within

This study aimed to evaluate the effects of tooth portion evaluated and colors abutment resin luting agent on final color monolithic zirconia crowns.Monolithic crowns were fabricated for left maxillary central incisors using two shades (A2 A3) highly translucent disks. A model was core materials (white: W; dentin: D). The measured with try-in pastes (clear: C; brown: B) as a resin-luting substitute. measurement performed after placing crown attached paste. three labial portions (cervical,...

Electron spins in GaAs quantum dots have been used to make qubits with high-fidelity gating and long coherence time, necessary ingredients solid-state computing. The can also host photon energy applicable for optical communication, show a promising photon-to-spin conversion. coherent interface is established through photo-excitation of single pair an electron Zeeman-resolved light-hole, not heavy-hole. However, no experiments on the spin conversion performed yet. Here we report shot readout...

Polarization is a fundamental property of light and could provide various solutions to the development secure optical communications with high capacity speed. In particular, coherent quantum state conversion between single photons electron spins prerequisite for long-distance distributed computation. Electrically defined dots have already been proven be suitable scalable solid qubits by demonstrations single-spin manipulations two-qubit gate operations. Thus, their information technologies...

Abstract A hybrid mass damper (HMD) using an electric servomotor for vibration control of buildings has been developed. The developed HMD installed in three order to improve habitability during strong winds and small‐to‐moderate earthquakes. We speculated that its high performance, compactness, reliability are important factors practical application actual buildings. have designed the system with suitable specifications size demands various object Several improvements were required each...