We have demonstrated that a supersonic beam of methyl radicals (CH_{3}) in the ground rotational state both para and ortho species has been slowed down to standstill with magnetic molecular decelerator, successfully captured spatially an anti-Helmholtz trap for >1 s. The trapped CH_{3} mean translational temperature about 200 mK estimated density >5.0×10^{7} cm^{-3}. radical is ideal system study cold molecules not only because its high reactivities at low temperatures, but also further...

Addressing the black hole information paradox necessitates exploration of various hypotheses and theoretical frameworks. Among these, proposition to utilize quantum entanglement, as introduced by Don N. Page, shows great promise. This study builds upon Page’s foundation proposes a simplified model for elucidating evolution von Neumann entropy. simulates process Hawking radiation using entangled photon pairs. Our experiment suggests that entanglement may offer plausible avenue resolving...

Abstract Quantum speed limit (QSL), the lower bound of time for transferring an initial state to a target one, is fundamental interest in quantum information processing. Despite that unitary evolution could be well analyzed by either Mandelstam–Tamm or Margolus–Levitin bound, there are still many unknowns QSL open systems. A particularly exciting result about can made arbitrarily small without violating time-energy uncertainty principle, whenever dynamics governed parity-time ( <?CDATA...

Control of the translational motion methyl radicals is demonstrated by using pulsed magnetic fields created a series solenoid coils. By synchronously switching corresponding to radicals, we have observed deceleration and focusing supersonic radical beam. The present result shows that Zeeman polyatomic free in doublet state can be realized. This opens possibilities for trapping cold spatially confined area leading further studies collisions reactions.

A high-performance, electrically driven, single-pyramid, micro light-emitting diode (micro-LED) was demonstrated. An insulated SiO2 layer, which served as a leakage current confinement layer (LCC layer), deposited at the lower part of pyramid, before deposition transparent conducting layer. The micro-LED with LCC demonstrated decrease in reverse by two orders magnitude and 190% increase light output 500 µA compared to without an small enables operate ultra-low injection (<1 µA). improved...

Measurements on very low disorder two-dimensional electrons confined to relatively wide GaAs quantum well samples with tunable density reveal a close competition between the electron liquid and solid phases near Landau level filling factor ν=1. As is raised, fractional Hall at ν=4/5 suddenly disappears well-width dependent critical density, then reappears higher densities insulating its flanks. These exhibit reentrant ν=1 integer effects signal formation of Wigner crystal states....

The Leggett-Garg inequality (LGI) delineates a boundary between quantum and classical systems. While the temporal correlations represented by LGIs have been extensively investigated in Hermitian domain, exploration of under non-Hermitian conditions remains scarce. Theoretical conjectures posit that nonunitary dynamics could transcend set mechanics, yet its empirical validation is lacking. Here, we demonstrate enhanced violation system parity-time ($\mathcal{PT}$)-symmetric trapped-ion qubit....

We have demonstrated that supersonic beams of oxygen molecules $({\text{O}}_{2})$ in the ground rotational state were slowed to a near standstill by linear Zeeman decelerator and successfully confined spatially an anti-Helmholtz magnetic trap. The translational temperature decelerated ${\text{O}}_{2}$ was about 800 mK. trapping capability paramagnetic species opens up various possibilities for investigation cold collisions reactions radicals sub-kelvin regime confining them

Non-Hermitian systems satisfying parity-time (

In this study, crack-free InGaN/GaN multiple quantum well (MQW) LEDs with five-pair AlN/GaN distributed Bragg reflectors (DBRs) were grown on a Si(111) substrate using linear compositionally graded AlGaN layer to compensate for tensile stresses. DBR-based exhibited higher light efficiency and better crystalline quality than non-DBR-based LEDs. Vertical-conducting realized through-hole structure. Through-holes formed from the n-GaN Si filled metals, which connected substrate. Insulating AlN,...

We generate a continuous-wave (cw) cold methyl cyanide (CH3CN) beam by using an L-shaped bent quadrupole electrostatic guide (i.e., low-pass energy or velocity filtering), and use photo-ionized time-of-flight mass-spectrometer method to experimentally measure study the dependences of longitudinal transverse temperatures guided CH3CN its guiding efficiency on voltage. find new scaling law: (Tz,Tρ) are proportional voltage (Tz,Tρ ∝ Vguide), further verify another molecular η is square (η...

A high power single-frequency operation at 1112 nm with novel insertable monolithic planar ring oscillator based on a Nd:YAG/YAG bonded crystal is proposed. In proof-of-principle experiment, finely designed coating the output surface carried out to ensure single-wavelength oscillation nm, together half-wave plate and Tb3Ga5O12 inserted in open space of block realize unidirectional scalability. Consequently, laser delivers an 3.9 W 1112.3 slope efficiency 58.6% optical-to-optical 17.7%. The...

In this work, the influence of V/III ratios low temperature (LT) AlN interlayer on GaN grown Si&lt;111&gt; substrate have been investigated. It was found that ratio LT-AlN is another important growth parameter, which crystalline quality strongly dependent on. By optimizing LT-AlN, high crack-free epilayer with lower dislocation density Si obtained. We attribute it to different surface morphology originated from ratio. Different could result in rates vertical and lateral direction,...

An all-solid-state AlGaN/GaN based ion-sensitive heterostructure field effect transistor (ISHFET) pH sensor was fabricated by integrating a noble metal (Au) quasi-reference electrode to improve the device stability when measuring value of small aqueous volume. In this paper, influence size against readings investigated. Through optimizing integrated electrode, ISHFET can sustain stable measurements for solutions micro-litre size. A sensitivity 55 mV/pH achieved at room temperature. Thus, may...

In this report, two types of normally-off AlGaN/GaN heterostructure field effect transistors (HFETs) with recessed-gate structure have been fabricated by using common technique induced coupled plasma (ICP) dry etching and a novel selective area growth (SAG), respectively. The devices SAG (SAG-HFET) showed better performance than that ICP-HFETs larger maximum drain current 300 mA/mm, positive threshold voltage 0.4 V, lower pinch off channel leakage (2.17×10-3 mA/mm). analysis indicates such...

A scheme for storage of cold molecules in a hollow optical ring generated by metasurface grating is proposed. The characteristics and intensity distribution related to the ring’s structural parameters fabrication error tolerance are theoretically studied. potential dipole force required trap magnesium monofluoride (MgF) also calculated. dynamic behavior MgF simulated Monte Carlo method, which shows that metasurface-based can be used an interesting platform research into ultracold quantum...

In this paper, crack-free InGaN/GaN multiple quantum wells (MQWs) light-emitting diodes (LEDs) were transferred from Si (111) substrate onto the electroplating Cu submount, with inserting a 5-pair TiO <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$_{2}$</tex></formula> /SiO omnidirectional reflector (ODR) and an Al mirror, defined as Notation="TeX">$_{2}$</tex> </formula> –Al ODR. The reflectivity...

Vertical InGaN multiple quantum wells light-emitting diodes (LEDs) with through-holes structure were transferred from Si(111) substrate onto the electroplating copper submount successfully. The additional series resistances induced by AlN buffer layer and other interlayer shorted metals filled through-holes. LED through-hole shows a low vertical conducting operating voltage small resistance. Combining removal technique, at 350 mA of reduce 5.6 to 5.1 V 7 4 Ω, in comparison before removal. At...

Parity-time (PT) symmetric non-Hermitian Hamiltonians bring about many novel features and interesting applications such as quantum gates faster than those in Hermitian systems, topological state transfer. The performance of evolutions under $\mathcal{PT}$-symmetric is degraded by the inevitable noise errors due to system-environment interaction experimental imperfections. In contrast Hamiltonians, fluctuations dissipative beams that are utilized generate contributions PT-symmetric cause...

Non-Hermitian systems satisfying parity-time (PT) symmetry have aroused considerable interest owing to their exotic features. Anti-PT is an important counterpart of the PT symmetry, and has been studied in various classical systems. Although a Hamiltonian with anti-PT only differs from its PT-symmetric global $\pm$ i phase, ways they change information energy enivronment are completely different, suggesting essential different dynamics anti-PT-symmetric -symmetric variants. Moreover,...

Minimizing the micromotion of a trapped ion in linear Paul trap is great importance maintaining long coherence time as well implementing quantum logic gates with high fidelity, which crucial for large-scale computation ions. Here, by applying RF (radio frequency)-photon correlation technique, we demonstrate that machine learning method based on artificial neural networks can quickly search optimal voltage settings electrodes to minimize ion's micromotion. This assisted RF-photon technique be...