Reconfigurable entanglement distribution network based on pump management of a spontaneous four-wave mixing source.

Leveraging the unique properties of quantum entanglement, quantum entanglement distribution networks support multiple quantum information applications and are essential to the development of quantum networks. However, practical implementation poses fundamental challenges to network scalability and flexibility. Here, we propose a reconfigurable entanglement distribution network scheme based on tunable multipump excitation of a spontaneous four-wave mixing (SFWM) source and a time-sharing method.

Free electrons spin-dependent Kapitza-Dirac effect in two-dimensional triangular optical lattice.

The free electron spin dynamics in Kapitza-Dirac (KD) effect had been studied theoretically in one-dimensional standing wave of EUV to X-ray laser with extremely high intensity, which is far beyond experimental realization. Here, we propose to achieve the free electron spin-dependent KD effect in two-dimensional triangular optical lattice with spatial inversion symmetry breaking, and the theoretical results reveal that laser with wavelength in visible or near-IR and five orders of magnitude decreased intensity could lead to obvious spin-dependent KD effect. This work provides the way to realize the free electron spin-dependent KD effect experimentally.

Tunable silicon integrated quantum light source with on-chip FSR-free filters.

In this work, we design and fabricate a telecom band quantum light source (QLS) on a silicon photonic chip, which integrates a piece of a long silicon waveguide as the nonlinear medium for spontaneous four-wave mixing (SFWM) and five narrow FSR-free bandpass filters based on a grating-assisted contra-directional coupler (GACDC). Two optical filtering functions of the silicon integrated QLS have been demonstrated. First, the QLS supports two tunable outputs of photon pair generations by four GACDC filters.

Electrically switchable 2-channel wave-front control for certain functionalities with N cascaded polarization-dependent metasurfaces.

Metasurfaces with tunable functionalities are greatly desired for modern optical system and various applications. To increase the operating channels of polarization-multiplexed metasurfaces, we proposed a structure of N cascaded dual-channel metasurfaces to achieve 2 electrically switchable channels without intrinsic loss or cross-talk for certain functionalities, including beam steering, vortex beam generation, lens, etc. As proof of principles, we have implemented a 3-layer setup to achieve 8 channels.

Topologically Protected Quantum Logic Gates with Valley-Hall Photonic Crystals.

Topological photonics provide a promising way to realize more robust optical devices against some defects and environmental perturbations. Quantum logic gates are fundamental units of quantum computers, which are widely used in future quantum information processing. Thus, constructing robust universal quantum logic gates is an important way forward to practical quantum computing.

Assessment of risk factors of lymph node metastasis and prognosis of Siewert II/III adenocarcinoma of esophagogastric junction: A retrospective study.

Adenocarcinoma of the esophagogastric junction (AEG) has a high incidence, and the extent of lymph node dissection (LND) and its impact on prognosis remain controversial. This study aimed to explore the risk factors for lymph node metastasis (LNM) and prognosis in Siewert II/III AEG patients. A retrospective review of 239 Siewert II/III AEG patients surgically treated at Beijing Friendship Hospital from July 2013 to December 2022 was conducted.

Hyperbolic photonic topological insulators.

Topological photonics provides a new degree of freedom to robustly control electromagnetic fields. To date, most of established topological states in photonics have been employed in Euclidean space. Motivated by unique properties of hyperbolic lattices, which are regular tessellations in non-Euclidean space with a constant negative curvature, the boundary-dominated hyperbolic topological states have been proposed.

Precise determination of energy transfer upconversion coefficient for the erbium and ytterbium codoped laser crystals.

Energy transfer upconversion (ETU) coefficient plays a crucial role in investigating complex laser systems as it greatly influences both the laser output behavior and heat generation. For some quasi-three-energy-level lasers based on Er doped, Ho doped and codoped gain media, the available theoretical studies relied on some unreasonable approximations due to the lack of spectroscopic data, notably the ETU coefficient. We put forward what we believe is a novel approach to overcome the difficulties caused by wavelength jump occurred in aforementioned laser systems.

Super-compact universal quantum logic gates with inverse-designed elements.

Integrated quantum photonic circuit is a promising platform for the realization of quantum information processing in the future. To achieve the large-scale quantum photonic circuits, the applied quantum logic gates should be as small as possible for the high-density integration on chips. Here, we report the implementation of super-compact universal quantum logic gates on silicon chips by the method of inverse design.

56-fs diode-pumped SESAM mode-locked Yb:YAl(BO) laser.

We report on the first sub-60 fs pulse generated from a diode-pumped SESAM mode-locked Yb-laser based on a non-centrosymmetric Yb:YAl(BO) crystal as a gain medium. In the continuous-wave regime, pumping with a spatially single-mode, fiber-coupled 976 nm InGaAs laser diode, the Yb:YAl(BO) laser generated 391 mW at 1041.7 nm with a slope efficiency as high as 65.

On-chip mechanical exceptional points based on an optomechanical zipper cavity.

Exceptional points (EPs) represent a distinct type of spectral singularity in non-Hermitian systems, and intriguing physics concepts have been studied with optical EPs recently. As a system beyond photonics, the mechanical oscillators coupling with many physical systems are expected to be further exploited EPs for mechanical sensing, topology energy transfer, nonreciprocal dynamics, etc. In this study, we demonstrated on-chip mechanical EPs with a silicon optomechanical zipper cavity, wherein two near-degenerate mechanical breathing modes are coupled via a single colocalized optical mode.

A curated dataset for hate speech detection on social media text.

Social media platforms have become the most prominent medium for spreading hate speech, primarily through hateful textual content. An extensive dataset containing emoticons, emojis, hashtags, slang, and contractions is required to detect hate speech on social media based on current trends. Therefore, our dataset is curated from various sources like Kaggle, GitHub, and other websites.

Phonon and photon lasing dynamics in optomechanical cavities.

Lasers differ from other light sources in that they are coherent, and their coherence makes them indispensable to both fundamental research and practical application. In optomechanical cavities, photon and phonon lasing is facilitated by the ability of photons and phonons to interact intensively and excite one another coherently. The lasing linewidths of both phonons and photons are critical for practical application.

Continuous-wave and passively Q-switched pulsed 1.5 µm Er:Yb:BaGd(PO) lasers.

An eye-safe 1567 nm continuous-wave laser with a maximum output power of 50 mW and a slope efficiency of 21.1% was demonstrated in an Er:Yb:BaGd(PO) crystal. By using a Co:MgAlO crystal with an initial transmission of 95% as a saturable absorber, a stable passively Q-switched pulsed laser was also realized in the crystal.

Clustering-based fusion for medical information retrieval.

Medicine is a fast-moving field, and the number of medical publications has increased rapidly over recent years. How to find relevant information from this vast pool of research effectively and efficiently has therefore become highly challenges. Previous studies have demonstrated that data fusion can improve search performance if properly utilized.

25.4 kW, 1.9 ns passively Q-switched 1522 nm Er:Yb:LuAl(BO) pulse microlaser at 100 Hz.

Passively Q-switched Er:Yb:LuAl(BO) pulse microlasers were investigated at a low repetition frequency of 10-200 Hz. End-pumped by a 975.6 nm quasi-continuous-wave laser diode with pump pulse width of 0.

All-optical image identification with programmable matrix transformation.

An optical neural network is proposed and demonstrated with programmable matrix transformation and nonlinear activation function of photodetection (square-law detection). Based on discrete phase-coherent spatial modes, the dimensionality of programmable optical matrix operations is 30∼37, which is implemented by spatial light modulators. With this architecture, all-optical classification tasks of handwritten digits, objects and depth images are performed.

The growth of a large GdPO crystal guided by theoretical simulation and the study of its phonon properties.

It has remained a big challenge to grow large crystals of compounds at very anisotropic crystal growth rates. GdPO is such an example, which usually grows into a needle-like shape. This work solved this problem by using Li ions, predicted by first-principles calculations, to adjust the crystal morphology of GdPO.

Single longitudinal-mode passively Q-switched 1537 nm Er:Yb:LuSiO pulse microchip laser.

A single longitudinal-mode passively Q-switched 1537 nm pulse microchip laser was realized in an Er:Yb:LuSiO crystal. The effects of the pump beam diameter and output mirror transmission on pulse characteristics of the Er:Yb:LuSiO microchip laser were investigated, when a Co:MgAlO saturable absorber with an initial transmission of 95% was used. At an absorbed pump power of 3.

Continuous-wave and SESAM mode-locked operation of the Yb:BiSiO laser.

We demonstrate a comprehensive characterization of the diode-pumped Yb:BiSiO laser operating in the continuous-wave and soliton mode-locked regimes. Pumping with a 650 mW, single-transverse mode, fiber-coupled laser diode, a maximum continuous-wave output power amounted to 213 mW with a slope efficiency up to 57.6%.

Hydrothermal syntheses, luminescent properties, and temperature sensing of monodisperse Tb-doped NaCeF nanocrystals.

Monodisperse Tb-doped NaCeF nanocrystals were synthesized a hydrothermal method. The morphology, and room temperature and temperature dependent luminescent properties were investigated. Excited at 254 nm, the emissions of Ce at 270-370 nm and those of Tb at 475-700 nm can be observed.

[Comparison of pedicled skin flap of foreskin for phalloplasty and Sugita surgical method in treatment of complete concealed penis].

Objective: To evaluate the effectiveness of pedicled skin flap of foreskin for phalloplasty and Sugita surgical method in the treatment of complete concealed penis.

Methods: The clinical data of 46 children with complete concealed penis between January 2016 and January 2018 were analyzed retrospectively. Among which, 25 cases were treated with pedicled skin flap of foreskin for phalloplasty (group A) and 21 cases were treated with Sugita surgical method (group B) with an average age of 4.

Cavity-dumped Q-switched Er:Yb:YAl(BO) pulse laser.

We reported an electro-optically cavity-dumped Q-switched Er:Yb:YAl(BO) pulse laser for the first time. A 1531.1 nm pulse laser with an average output power of 521 mW, energy of 10 µJ, and a duration of 3.

Continuously diode-pumped passively $Q$Q-switched eye-safe 1537 nm Er:Yb:LuSiO pulse laser.

It is still a technical challenge to obtain a 1.55 µm passively $Q$Q-switched ${{\rm Er}^{3 + }}/{{\rm Yb}^{3 + }}$Er/Yb pulse laser with high energy and high repetition frequency, especially when it is end-pumped by a continuous-wave 0.98 µm diode laser.