A5110262043- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Terahertz technology and applications
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Gyrotron and Vacuum Electronics Research
- Thermal Radiation and Cooling Technologies
- Atmospheric Ozone and Climate
- Semiconductor Quantum Structures and Devices
- Quantum Information and Cryptography
- Soil Moisture and Remote Sensing
- Adaptive optics and wavefront sensing
- Advanced Antenna and Metasurface Technologies
- Quantum Mechanics and Applications
- Optical Coatings and Gratings
- Quantum Computing Algorithms and Architecture
- Advanced Optical Sensing Technologies
- Precipitation Measurement and Analysis
- Superconductivity in MgB2 and Alloys
- Particle accelerators and beam dynamics
- Astrophysics and Star Formation Studies
- Electromagnetic Compatibility and Measurements
Purple Mountain Observatory
2016-2025
University of Science and Technology of China
2018-2024
Shanghai Astronomical Observatory
2023
Chinese Academy of Sciences
2009-2022
Sichuan Agricultural University
2022
National Astronomical Observatories
2004-2019
Nanjing Institute of Astronomical Optics & Technology
2015-2017
Korea Astronomy and Space Science Institute
2012
Netherlands Institute for Radio Astronomy
2011
Nanjing Forestry University
2009
We have developed a 3 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\times$</tex></formula> multibeam sideband separation superconducting receiver—Superconducting Spectroscopic Array Receiver (SSAR)—for the 85–115 GHz frequency band. The receiver employs 2SB superconductor–insulator–superconductor (SIS) mixers with typical single (SSB) noise temperature of 60 K and image rejection ratio above 10 dB...
Quantum mechanics provides the means of generating genuine randomness that is impossible with deterministic classical processes. Remarkably, unpredictability can be certified in a manner independent implementation devices. Here, we present an experimental study device-independent quantum random number generation based on detection-loophole-free Bell test entangled photons. In analysis, without identical distribution assumption, consider worst case scenario adversary launches most powerful...
Two types of WR-3 band quasi-elliptical waveguide bandpass filters (BPFs) using higher order mode resonators are presented based on physical cross coupling and modal bypass coupling, respectively. Under the situation folded structure, a TE102-mode in an oversized resonator is utilized to reverse magnetic field direction main path implement negative (Filter-I). Limited structure Filter-I itself, simulated 3 dB fractional bandwidth (FBW) 8.5% slightly narrower than desired 10% FBW. For other...
Interactions of 100-fs laser pulses with solid targets at intensities 10${}^{18}$ W/cm${}^{2}$ and resultant terahertz (THz) radiation are studied under different contrast ratio conditions. THz emission is measured in the specular reflection direction, which appears to decrease as varies from 10${}^{\ensuremath{-}8}$ 10${}^{\ensuremath{-}6}$. Correspondingly, frequency spectra reflected light observed changing second harmonic dominant, three-halves vanishing both harmonics. Two-dimensional...
As the highest, coldest and driest place in Antarctica, Dome A provides exceptionally good observing conditions for ground-based observations over terahertz wavebands. The 5 m Terahertz Explorer (DATE5) has been proposed to explore new windows, primarily wavelengths between 350 200 μm. DATE5 will be an open-air, fully-steerable telescope that can function by unmanned operation with remote control. able endure harsh polar environment, including high altitude, very low temperature air...
A 220-GHz low-loss and wideband waveguide bandpass filter with fourth-order quasi-elliptic response is presented analyzed in this letter. An electric cross-coupling realized by easily manufactured capacitive iris introduced the classical folded quadruplet topology. The prototype fabricated conventional computer numerical control (CNC)-metal-milling technology exhibits meaningful results of an insertion loss around 0.6 dB a 3-dB fractional bandwidth 9.8% centered at 214.3 GHz, which are...
Abstract Transition Edge Sensors (TESs) are highly sensitive thermal detectors that operate across a wide frequency range, from millimeter waves to gamma rays. For optical single-photon TES detectors, high energy resolution and large saturation required, primarily limited by factors such as heat capacitance temperature sensitivity, α I . In this study, we evaluated devices of varying sizes conducting complex impedance measurements using transfer function calibration, revealing our...
We report a an experimental study of device-independent quantum random number generation based on detection-loophole free Bell test with entangled photons. After considering statistical fluctuations and applying 80 Gb × 45.6 Mb Toeplitz matrix hashing, we achieve final bit rate 114 bits/s, failure probability less than 10−5.
Large-scale mapping observations of the 3P1-3P0 fine-structure transition atomic carbon (C i, 492 GHz) and J=3-2 CO (346 toward Orion A molecular cloud have been carried out with Mount Fuji submillimeter-wave telescope. The cover 9 deg2 include Nebula M42 L1641 dark complex. C i emission extends over almost entire region is surprisingly similar to that 13CO (J=1-0). (J=3-2) shows a more featureless extended distribution than i. i/CO integrated intensity ratio spatial gradient running from...
We present the design and preliminary experimental results of superconductor-insulator-superconductor (SIS) mixers for Atacama large millimeter array (ALMA) band 10 (780-950GHz) receivers. To achieve wide frequency coverage as well low noise temperature, we integrated high current density (10 kA/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) small-sized (one micrometer in diameter) Nb/AlO <sub...
We report the detection of spectral line emission from CO (J=4–3) at 0.46THz using a low-noise 0.5THz superconductor-insulator-superconductor (SIS) mixer incorporating NbN∕AlN∕NbN tunnel junctions (with an energy gap 5.6meV) and NbN∕MgO∕NbN tuning circuit, which is installed on 30cm submillimeter telescope. Uncorrected receiver noise temperatures as low 149K are measured telescope 0.45–0.50THz for unoptimized device. Moreover, all-NbN SIS exhibits high stability in considerably large dc bias...
A high-performance waveguide bandpass filter operating at W-band is presented. This folded fourth-order with quasi-elliptic response developed by introducing cross-coupling and source–load coupling, while maintaining a compact construction for simple computer numerical control (CNC) milling process. The fabricated within aluminium block shows an insertion loss of about 1.2 dB in 3 fractional bandwidth 5.5% from 90.1 to 95.2 GHz, which are very close the simulated results full W-band.
Modern terahertz (THz) receivers used in radio astronomy are aimed at developing multipixel instruments, which the polarization twists often required. In this article, an allin-one and low-loss 90° waveguide twist is developed for working over full WR-3 band. A square junction with a doubler-corner-cut integrated between H-plane E-plane waveguides to provide rotating. All vertical corners fillet comply fabrication constraints of current computer numerical control (CNC) machining. The...
A distribution of the neutral carbon atom (C I) in Heiles cloud 2 (HCL2) has been investigated with Mount Fuji submillimeter-wave telescope. region 1.2 deg2 covering a whole HCL2 mapped 3P1-3P0 fine-structure line (492 GHz) C I. The global extent I emission is similar to that 13CO, extending from southeast northwest. However, intensity found be rather weak dense cores traced by J = 1-0 C18O. On other hand, strong observed south part which C18O fairly weak. I/CO abundance ratio greater than...
We present observations of the 3P1-3P0 fine-structure transition atomic carbon [C I], J = 3-2 CO, and 1-0 transitions 13CO C18O toward DR 15, an H II region associated with two mid-infrared dark clouds (IRDCs). The emissions closely follow patches seen in optical wavelength, showing self-gravitating molecular cores masses 2000 900 M☉, respectively, at positions cataloged IRDCs. Our data show a rough spatial correlation between I] 1-0. Bright emission occurs relatively cold gas behind but...
We have fabricated a superconductor-insulator-superconductor (SIS) mixer using couple of junctions connected in parallel through stripline inductor. The significantly larger area, i.e. capacitance, and smaller normal resistance than conventional ones. In order to obtain good impedance matching between the source junctions, an transformer made superconducting was integrated with junctions. capacitance tuned out by inductor broadband operation without mechanical tuning elements. It shown that...
Superconducting titanium thin films are good candidates for transition edge sensors. In this paper, we deposit on cooled silicon-on-insulator substrates by using electron-beam evaporation. The deposition rate dependence of the film stress, resistivity, and superconducting temperature presented analyzed. relationship between electrical properties thickness is discussed. For investigating heating influence Ti films, a depth profile oxygen diffusion in also analyzed X-ray photoelectron spectroscopy.
Microwave synthetic aperture interferometric radiometers (SAIRs) are very powerful instruments for high-resolution remote sensing of the atmosphere and earth surfaces at microwave frequencies. SAIR imaging reconstruction from measurements suffers hardware non-identities, limited prior information, noise interference, consequently often requires expert calibration strategies to reduce error improve accuracy reconstruction. In this article, we propose a new approach with deep convolutional...
Classical correlation can be locked via quantum means--quantum data locking. With a short secret key, one lock an exponentially large amount of information, in order to make it inaccessible unauthorized users without the key. Quantum locking presents resource-efficient alternative one-time pad encryption which requires key no shorter than message. We report experimental demonstrations scheme originally proposed by DiVincenzo et al. [Phys. Rev. Lett. 92, 067902 (2004)] and loss-tolerant...