We study quantum measurement with preselection and postselection, derive the precise expressions of results without any restriction on coupling strength between system measuring device. For a qubit system, we maximum pointer shifts by choosing appropriate initial finial states. A significant amplification effect is obtained when interaction device very weak, typical ideal are strong. The improvement signal-to-noise ratio (SNR) enhancement sensitivity (MS) weak measurements studied. Without...

We report on the realization of a transversely loaded two-dimensional magneto-optical trap serving as source for cold strontium atoms. analyze dependence source's properties various parameters, in particular intensity pushing beam accelerating atoms out source. An atomic flux exceeding ${10}^{9}\phantom{\rule{0.28em}{0ex}}\mathrm{atoms}/\mathrm{s}$ at rather moderate oven temperature $500{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$ is achieved. The longitudinal velocity can...

We present the characterization of a laser frequency stabilization scheme using state-of-the-art wavelength meter based on solid Fizeau interferometers. For frequency-doubled Ti-sapphire operated at 461 nm, an absolute Allan deviation below 10-9 with standard 1 MHz over 10 h is achieved. Using this for cooling and trapping strontium atoms, wavemeter provides excellent stability in single-channel operation. Multi-channel operation multimode fiber switch results fluctuations atomic...

We report on the atom loss spectroscopy of strontium Rydberg atoms in a magnetooptical trap, using two-photon excitation scheme through intermediate state $5s5p{\phantom{\rule{0.16em}{0ex}}}^{3}{P}_{1}$. Energies $5sns{\phantom{\rule{0.16em}{0ex}}}^{3}{S}_{1}$ and $5snd{\phantom{\rule{0.16em}{0ex}}}^{3}{D}_{1,2}$ series $^{88}\mathrm{Sr}$ range $13\ensuremath{\le}n\ensuremath{\le}50$ are determined with an absolute accuracy 10 MHz, including perturbed region where...

We demonstrate enhanced loading of strontium atoms into a magneto-optical trap using repumping scheme from the metastable state via doubly excited $5s5p{\phantom{\rule{0.16em}{0ex}}}^{3}{P}_{2}\ensuremath{\rightarrow}5{p}^{2}{\phantom{\rule{0.16em}{0ex}}}^{3}{P}_{2}$ at $481\phantom{\rule{3.33333pt}{0ex}}\mathrm{nm}$. The number trapped is increased by an order magnitude. frequency and intensity dependence atom enhancement, with respect to nonrepumping case, well reproduced simple rate...

In this paper, the design of a novel 1-bit digital coding reconfigurable refiectarray using aperture-coupled elements controlled by Pin diodes is presented. The element consists microstrip patch, to transmission line loaded with two diodes. Each unit cell can be electronically generate states 180° phase difference. mimic "0" and "1" for coding. By sequence states, electromagnetic waves manipulated reach different functionalities. Then \pmb10×10 array simulated in High Frequency Structure...

We demonstrate the interaction-induced blockade effect in an ultracold $^{88}\mathrm{Sr}$ gas via studying time dynamics of a two-photon excitation to triplet Rydberg series $5sns{\phantom{\rule{0.16em}{0ex}}}^{3}{S}_{1}$ for five different principal quantum numbers $n$ ranging from 19 37. By using multipulse sequence increase detection sensitivity, we could identify Rydberg-excitation-induced atom losses as low $<1%$. Based on optical Bloch equation formalism, treating Rydberg-Rydberg...

Crystalline optical cavities operating at cryogenic temperatures provide a promising route for realizing the next generation of ultrastable lasers with extremely low thermal noise floor. However, it remains challenging to realize closed-cycle cryostat cooling relatively long cavity very temperatures. Here we report on design and experimental realization continuously 3.1 K an 10-cm silicon cavity. Based combination active temperature control passive damping, two-second instability 6 × 10 −8...

The realization of spin-orbit-coupled ultracold gases has driven a wide range research and is typically based on the rotating wave approximation (RWA). By neglecting counter-rotating terms, RWA characterizes single near-resonant spin-orbit (SO) coupling in two-level system. Here, we propose experimentally realize new scheme for achieving pair two-dimensional (2D) SO couplings fermions beyond RWA. This work not only realizes first anomalous Floquet topological Fermi gas RWA, but also...

Aiming at solving the economy and effectiveness of power electronic compensation devices energy storage on long-chain distribution lines, a multi-layer joint optimization method is proposed in this paper. This can determine optimal location capacity devices. A 13-node system established based actual route Guoluo Prefecture, Qinghai Province was used for verification, which result shows that model solution are correct.

Strongly Rydberg-blockaded two-level atoms form a Rydberg superatom, which is excited only to collective symmetrical Dicke state. However, emerging often in the alkali-earth atoms, spontaneous decay from state an additional pooling renders ensemble no longer closed superatom. Herein we present computationally-efficient model characterize interaction between fully of $N$ $\Lambda$-type three-level and strong probe light field coherent The enables us achieve decomposition coupled dynamics...

Voltage drop is one of the key influencing factors power quality. Based on load voltage-power characteristics, on-load voltage regulation technology analyzed to demonstrate that there such a problem compensation for drawing from grid may aggravate drop. The working principle dynamic restorer (DVR) analyzed, which has defect insufficient energy self-recovery ability. Therefore, novel sag based an external supply proposed, greater degree freedom in and functions can adjust peak-valley balance grid.

The realization of spin-orbit-coupled ultracold gases has driven a wide range researches and is typically based on the rotating wave approximation (RWA). By neglecting counter-rotating terms, RWA characterizes single near-resonant spin-orbit (SO) coupling in two-level system. Here, we propose experimentally realize new scheme for achieving pair two-dimensional (2D) SO couplings fermions beyond RWA. This work not only realizes first anomalous Floquet topological Fermi gas RWA, but also...

In this paper, we propose a method to discriminate two extremely similar quantum states via weak measurement. For the with equal prior probabilities, optimum discrimination probability given by Ivanovic-Dieks-Peres limit can be achieved our protocol an appropriate choice of interaction strength. However, compared conventional for state discrimination, approach shows advantage error-tolerance achieving better ratio success error.