Article
Chemistry, Multidisciplinary
Mei Yu, Chun Li, Xiang Gao, Zhenguo Wang, Tu-Lu Liang, Jin Shi, Jian-Xin Shi, Weiwei Xu
Summary: This work proposes two types of stub tuners integrated with a bowtie antenna to improve the coupling efficiency with a high-Tc superconducting Josephson junction (JJ) mixer. The measurements show that the JJ mixer coupled with open-end stubs of the bowtie antenna achieves higher conversion efficiency and more harmonics compared to the one coupled with lumped-element stubs. Numerical simulations also indicate the enhanced coupling efficiency by considering the complex impedance of the antenna.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
Isha Mehra, Naveen K. Nishchal
Summary: In this paper, a novel optical asymmetric fingerprint image encryption technique is proposed using QR decomposition in the gyrator wavelet transform domain. The fingerprint image is combined with a phase mask generated by the Gerchberg-Saxton phase retrieval algorithm, which is then gyrator wavelet transformed. The output is further processed with QR decomposition to generate different keys, enhancing the security level. The proposed encryption scheme demonstrates security, privacy, and validity through numerical simulations on a MATLAB platform.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Jian Gao, Xinghua Wang, Fang Han, Jiayue Wan, Wei Gu
Summary: In this study, a non-magnetic on-chip passive circulator operating at the Ku band was designed and implemented using a 90-nm bulk CMOS technology. The proposed circulator achieved competitive isolation, linearity performance, and isolation bandwidth, with a 3.9 dB TX-to-ANT insertion loss and a 4.0 dB ANT-to-RX insertion loss.
Article
Nanoscience & Nanotechnology
Joydip Sarkar, Kishor Salunkhe, Supriya Mandal, Subhamoy Ghatak, Alisha H. Marchawala, Ipsita Das, Kenji Watanabe, Takashi Taniguchi, R. Vijay, Mandar M. Deshmukh
Summary: Josephson junctions (JJs) and their tunable properties are crucial for superconducting qubits and amplifiers. This study demonstrates a quantum-noise-limited Josephson parametric amplifier (JPA) using a graphene Josephson junction (JJ) with linear resonance gate tunability. The gate-tunable JPA exhibits high amplification performance and operates in the quantum-limited noise regime, making it an attractive option for sensitive signal processing.
NATURE NANOTECHNOLOGY
(2022)
Article
Crystallography
Ze Yu Lian, Yang Zhang, Xue Zhong Wang
Summary: This study utilized a new process design involving impinging jet mixers integrated with a stirred tank for the preparation of high-quality hydrotalcite crystals. The new design showed superior performance compared to conventional stirred tanks, resulting in narrow particle size distribution, large size and high bulk density, high purity, and uniform morphology of the crystals. Additionally, the mechanistic understanding of the reactive crystallization processes inside the integrated impinging jet mixers-stirred tank equipment was also explored.
JOURNAL OF CRYSTAL GROWTH
(2022)
Review
Computer Science, Information Systems
Francisco J. Romero, Akiko Ohata, Alejandro Toral-Lopez, Andres Godoy, Diego P. Morales, Noel Rodriguez
Summary: The concept of memristor was introduced by Prof. L. Chua in 1971 as a new circuit element, later extended to memcapacitors and meminductors. The non-linear and non-volatile properties of these devices have attracted interest for various applications.
Article
Optics
Xiang Gao, Huanxin LI, Ting Zhang, Jia Du, Ken Smart, Jianjun Ma, Jianping An
Summary: This paper presents a 600 GHz high-temperature superconducting sub-harmonic mixer with a double-Y-type slot antenna and a cascaded filter network. The experimental results show that the mixer achieves the best performance among similar frequency and operating temperature conditions.
Article
Chemistry, Multidisciplinary
Fatemeh Barati, Josh P. Thompson, Matthieu C. Dartiailh, Kasra Sardashti, William Mayer, Joseph Yuan, Kaushini Wickramasinghe, Kenji Watanabe, Takashi Taniguchi, Hugh Churchill, Javad Shabani
Summary: Epitaxial Al-InAs heterostructures with gate-tunable JJ-FETs show promise for exploring mesoscopic and topological superconductivity. By using mechanically exfoliated h-BN as the gate dielectric, full gate-tunability of supercurrent can be achieved on Al-InAs JJ-FETs while preserving the pristine properties of Josephson junctions. Additionally, h-BN dielectric causes less change in channel density compared to Al2O3 atomic layer deposition.
Article
Engineering, Electrical & Electronic
Tom B. Herbert, Joseph S. Hyland, Shakeeb Abdullah, Jim Wight, Rony E. Amaya
Summary: This study demonstrates the performance of the first active bandpass filter to implement an active inductor in GaN technology. The active filter shows a wide tuning range and excellent quality factor, showcasing its capabilities in LTE/WLAN applications.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Materials Science, Multidisciplinary
Yuejian Zhang, Xiping Yang, Jia-Jin Feng, Zhi Wang, Tianxing Ma
Summary: Josephson radiation is a useful signature for detecting Majorana zero modes in topological superconductors. The quantum dynamics of the Majorana two-level system induce oscillatory patterns in the Josephson emission spectra, which can be well described by Bessel functions. These Bessel radiation patterns exist for a wide range of junction parameters, as verified by numerical simulations.
Article
Nanoscience & Nanotechnology
Gaia Germanese, Federico Paolucci, Giampiero Marchegiani, Alessandro Braggio, Francesco Giazotto
Summary: This study demonstrates the presence of large thermoelectric effects in superconducting tunnel junctions when there is a significant thermal gradient. By integrating these junctions into a Josephson interferometer, a bipolar thermoelectric Josephson engine capable of generating phase-tunable electric power is realized. These findings are expected to have applications in superconducting quantum technologies.
NATURE NANOTECHNOLOGY
(2022)
Article
Quantum Science & Technology
Baleegh Abdo, Oblesh Jinka, Nicholas T. Bronn, Salvatore Olivadese, Markus Brink
Summary: This study presents a fast and high-fidelity quantum non-demolition readout technique for superconducting qubits without the use of nonreciprocal magnetic devices. By utilizing a microwave-controlled qubit readout multichip module (QRMCM), efficient isolation and low-noise amplification can be achieved, potentially replacing magnetic devices in large superconducting quantum processors.
Article
Materials Science, Multidisciplinary
Oleksii Maistrenko, Benedikt Scharf, Dirk Manske, Ewelina M. Hankiewicz
Summary: The study reveals that uniform magnetization in three-dimensional topological insulator Josephson junctions can induce asymmetry in the Andreev spectrum, leading to Majorana modes and the Josephson Hall effect. Magnetic control and gating can enable significant Josephson Hall currents compared to longitudinal currents.
Article
Chemistry, Analytical
Ruixuan Hu, Xiaolong Li, Jian Xu, Ya Cheng, Min Zhang, Guoyue Shi
Summary: In this study, a three-dimensional microfluidic chip was fabricated using ultrafast laser-processing technology for the continuous synthesis of semiconducting polymer nanoparticles (SPNs) with tunable size. The efficient mixing and powerful vortices of the chip ensured a homogeneous distribution of SPNs and prevented aggregation during synthesis. The integrated high-performance fluorescence of SPNs and the 3D microfluidic chip enabled the development of an online sensing platform for ratiometric fluorescence assays, achieving low limits of detection for H2O2 and glucose. This platform offers new opportunities for facile nanoparticle production and online sensing of biomarkers.
ANALYTICAL CHEMISTRY
(2023)
Article
Computer Science, Information Systems
Zhuhong Shao, Leding Li, Xiaoxu Zhao, Bicao Li, Xilin Liu, Yuanyuan Shang
Summary: This paper introduces a novel encryption framework for stereo image. The proposed encryption scheme utilizes quaternion matrix decomposition, block-wise quaternion gyrator transform, and two-dimensional logistic-Sine-coupling map to enhance security. Numerical simulation results demonstrate feasibility and reliability.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)