Article
Physics, Multidisciplinary
J. Stehlik, D. M. Zajac, D. L. Underwood, T. Phung, J. Blair, S. Carnevale, D. Klaus, G. A. Keefe, A. Carniol, M. Kumph, Matthias Steffen, O. E. Dial
Summary: The article introduces a modified tunable bus architecture suitable for fixed-frequency qubits, achieving high-fidelity 2-qubit operations. Experimental results demonstrate a maximum gate fidelity of 99.85% with good calibration stability over one day.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Kaixuan Zhang, Chunhai Cao, Jian Chen, Huabing Wang, Guozhu Sun, Peiheng Wu
Summary: We propose a frequency-tunable source that emits entangled microwave photons on a superconducting circuit platform. This is achieved by coupling two superconducting transmission-line resonators via a capacitor, with a superconducting quantum interference device (SQUID) inserted in one resonator. When the circuit is appropriately pumped with an external coherent microwave signal through the SQUID, pairs of microwave photons are emitted out of the circuit. Numerical calculations of the second-order coherence function and logarithmic negativity of the output microwave signals demonstrate the entanglement between the two modes. The frequencies of the entangled microwave photons can be tuned in situ by adjusting the external flux bias of the SQUID's equivalent inductance. Our proposal opens up a new avenue for obtaining entangled frequency-tunable two-mode microwave photons.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Multidisciplinary
Shuai-Peng Wang, Zhen Chen, Tiefu Li
Summary: This study experimentally investigates the generation of controllable frequency comb in the microwave range, using a tunable superconducting coplanar-waveguide resonator. The central frequency and teeth density of the comb can be precisely controlled, and the number of sidebands can be increased with drive power. The minimum drive power required to generate the comb approaches the quantum limit.
Article
Optics
Amin Rastgordani, Zahra Ghattan Kashani, Mohammad Sadegh Abrishamian
Summary: In recent years, invisibility has become a research area of interest due to advances in material engineering. One proposed approach involves using bulk Dirac semimetal cloaking metasurfaces to achieve scattering cancelation in the terahertz spectrum. An algorithm has been developed to determine the features of the anisotropic cover for achieving mantle cloaking.
Article
Chemistry, Multidisciplinary
Hancong Sun, Shixian Chen, Yong-Lei Wang, Guozhu Sun, Jian Chen, Takeshi Hatano, Valery P. Koshelets, Dieter Koelle, Reinhold Kleiner, Huabing Wang, Peiheng Wu
Summary: A compact cryogenic terahertz emitter based on Bi2Sr2CaCu2O8 + delta (BSCCO) intrinsic Josephson junctions is reported in this paper, with a frequency range from 0.15 to 1.01 THz. The emitter is a square gold-BSCCO-gold mesa on a sapphire substrate fabricated by a simple and efficient method. The highest emission power of 5.62 μW at 0.35 THz was observed at 50 K, while a record low emission frequency of 0.15 THz was achieved at 85 K, extending the applicability of BSCCO terahertz emitters in the low-frequency range.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Qinghong Liao, Haiyan Qiu, Min Xiao, Wenjie Nie
Summary: A scheme is proposed to explore the absorption spectrum and susceptibility of a loop-coupled hybrid system consisting of superconducting flux qubit and two mechanical resonators. The transparency based on mechanically induced coherent population oscillation (MICPO) can be controlled by adjusting the Rabi frequency and decay rate of the mechanical resonator. A novel and precise method for measuring the frequency of the mechanical resonator is presented, along with a technique for designing nonlinear susceptibility switches. Furthermore, the coupling strength between the two mechanical resonators can be determined from the distance between two peaks in the probe spectrum. This study has significant implications for precision measurement and quantum information processing.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
An-Lei Zhang, Vladimir Gladilin, Joris Van de Vondel, Victor V. Moshchalkov, Jun-Yi Ge
Summary: The study investigates the magnetic flux and number of vortices in superconducting strips, finding that the experimental results align well with theoretical simulations. The observed immunity of magnetic flux to flowing supercurrent may have potential for new prospects in fundamental research and applications.
Article
Chemistry, Multidisciplinary
Zijie Ji, Ruan Zhang, Shuangxing Zhu, Feifan Gu, Yunmin Jin, Binghe Xie, Jiaxin Wu, Xinghan Cai
Summary: In this work, the modulation of photoresponsivity by gate voltage in a two-dimensional NbSe2-graphene heterojunction is demonstrated. The superconducting critical current of NbSe2 is dependent on the gate-modulated hot carrier generation in graphene through the Joule heating effect, which leads to changes in the magnitude and peak position of the photoresponsivity spectra. The inhomogeneity of superconductivity across the junction area is also observed. These findings provide a new platform for designing tunable superconducting photodetectors and highlight the potential of photoresponse in studying local electronic properties and phase transitions in low-dimensional superconducting systems.
Article
Multidisciplinary Sciences
Huolei Feng, Xingwei Zhang, Yuekai Zhang, Limin Zhou, Yushan Ni
Summary: The designed confocal elliptical core-shell structure can achieve omnidirectional camouflage effect without affecting temperature and electric potential profiles. The composite structure proposed in the study successfully eliminates scattering caused by the elliptical core under different directions, demonstrating omnidirectional thermal-electric camouflage effect experimentally.
Article
Physics, Applied
Jose M. Chavez-Garcia, Firat Solgun, Jared B. Hertzberg, Oblesh Jinka, Markus Brink, Baleegh Abdo
Summary: Flux-tunable qubits are an important resource for superconducting quantum processors. They have various applications but suffer from a trade-off between their tunability range and sensitivity to flux noise. By implementing a coherent, flux-tunable transmon-like qubit, it is possible to achieve fast, high-fidelity, all-microwave cross-resonance gates in large processors, while avoiding frequency collisions and minimizing susceptibility to flux noise.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Bradley K. Mitchell, Ravi K. Naik, Alexis Morvan, Akel Hashim, John Mark Kreikebaum, Brian Marinelli, Wim Lavrijsen, Kasra Nowrouzi, David I. Santiago, Irfan Siddiqi
Summary: In this study, a tunable ZZ interaction between two fixed-frequency and fixed-coupling transmon qubits is achieved, with adjustable coupling range larger than static coupling and changeable sign of interaction. This interaction is suitable for large quantum processors, with flexible drive frequency choice and resilience to microwave cross talk, enabling the implementation of a controlled phase (CZ) gate with high fidelity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Tim Menke, William P. Banner, Thomas R. Bergamaschi, Agustin Di Paolo, Antti Vepsalainen, Steven J. Weber, Roni Winik, Alexander Melville, Bethany M. Niedzielski, Danna Rosenberg, Kyle Serniak, Mollie E. Schwartz, Jonilyn L. Yoder, Alan Aspuru-Guzik, Simon Gustavsson, Jeffrey A. Grover, Cyrus F. Hirjibehedin, Andrew J. Kerman, William D. Oliver
Summary: This study presents a superconducting circuit architecture that enables two-local and three-local interactions between three flux qubits through a designed coupling module. The system Hamiltonian is estimated using multiqubit pulse sequences implementing Ramsey-type interferometry. The three-local interaction can be coherently tuned over several MHz via the coupler flux biases and can also be turned off. This research has significant applications in quantum annealing, analog quantum simulation, and gate-model quantum computation.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Yu Zhou, Zhenxing Zhang, Zelong Yin, Sainan Huai, Xiu Gu, Xiong Xu, Jonathan Allcock, Fuming Liu, Guanglei Xi, Qiaonian Yu, Hualiang Zhang, Mengyu Zhang, Hekang Li, Xiaohui Song, Zhan Wang, Dongning Zheng, Shuoming An, Yarui Zheng, Shengyu Zhang
Summary: The study presents a fast and high-fidelity reset scheme for quantum qubits, achieved by modulating the flux through the qubit to swap with its readout resonator within 34 ns. This approach can effectively deplete the second excited state, has negligible effects on neighboring qubits, and offers a way to entangle the qubit with a single photon for quantum communication applications.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Youngno Youn, Daehyeon Kim, Suho Chang, Jaehyun Choi, Wonbin Hong
Summary: This communication presents the concept of a scattering mitigation frequency-selective surface (FSS) for compensating unidirectional blockages without modifying the obstacles. The proposed FSS generates a complementary electric field to the blockage, making it transparent to the antenna. Experimental results demonstrate improved main beam peak gain and restored far-field radiation patterns in various scattering scenarios.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Elena S. Redchenko, Alexander V. Poshakinskiy, Riya Sett, Martin Zemlicka, Alexander N. Poddubny, Johannes M. Fink
Summary: The two frequency-modulated superconducting qubits act as a switchable mirror for microwave photons, providing on-demand tunable directional scattering. This ability is crucial for various on-chip applications, such as integrated photonics, quantum information processing, and nonlinear optics. By changing the relative phase between the modulation tones, unidirectional forward or backward photon scattering can be realized. This in-situ switchable mirror represents a versatile tool for intra- and inter-chip microwave photonic processors.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Xiao-gang Yin, You-wen Liu, Cheng-ping Huang
Summary: This paper investigates a highly symmetric all-metallic metamaterial and demonstrates that high Q-factor trapped mode resonances can be achieved by weakly asymmetric metamolecules. The resonant effect is attributed to the destructive interference between anti-phased excitations, with the hole separation greatly affecting the coupling and radiation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Yanjun Ji, Li Bian, Ni Liu, Junping Wang, Caifeng Wang, Yujie Du, Youwen Liu
Summary: First-principles density functional theory simulations were performed to investigate the adsorption of Cs and O atoms on the (2 x 2) Al0.5Ga0.5N(0001) surface. It was found that coadsorption of Cs and O leads to stability and improved surface structure compared to Cs adsorption alone, especially at a coverage of 0.75 ML. The adsorption behavior of Cs and O on the surface varied with different coverages, affecting adsorption energy and dipole moment.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Energy & Fuels
Kai Gao, Jiale Yang, Honglie Shen, Youwen Liu, Yufang Li, Meiling Zhang
Summary: By introducing a selective solar absorber, the output power of self-generation power devices based on the radiative cooling effect was significantly enhanced. Experimental results demonstrate that adding a solar selective absorber can increase the temperature difference and improve the efficiency of the device under different weather conditions.
Article
Physics, Applied
Xiao Li, Daxing Dong, Jiaqing Liu, Youwen Liu, Yangyang Fu
Summary: In this work, an acoustic metagrating (MG) with perfect retroreflection is realized using an inverse-design scheme, improving upon the limited efficiency of previous designs. The study also highlights the importance of evanescent guided modes in achieving perfect retroreflection, and identifies an orthogonal relationship between the contribution ratios of odd and even guided modes.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Changdong Chen, Youwen Liu, Lina Zhao, Xiaopeng Hu, Yangyang Fu
Summary: In this work, we propose a new scheme for achieving asymmetric nonlinear-mode conversion (NMC) by combining frequency-doubling process and periodic PT symmetric modulation in an optical waveguide. By engineering the one-way momentum from PT symmetric modulation, we demonstrate the unidirectional conversion from pump to second harmonic with desired guided modes. These findings offer new opportunities for manipulating nonlinear optical fields with PT symmetry, and further promote more exploration on on-chip nonlinear devices assisted by non-Hermitian optics.
FRONTIERS OF PHYSICS
(2022)
Correction
Chemistry, Multidisciplinary
Chenguang Deng, Lianxu Ye, Chongjun He, Guisheng Xu, Qinxiao Zhai, Haosu Luo, Youwen Liu, Andrew J. Bell
ADVANCED MATERIALS
(2022)
Article
Optics
Tong Wu, Jincong Zou, Youwen Liu, Yuangang Lu, Jiming Wang, Yaoyao Shi, Hong Shen, Xiaorong Gu, Chongjun He
Summary: We presented a method for extracting the local polarization properties of a birefringent sample using a single incident state in a single-mode-fiber-based spectral domain polarization-sensitive optical coherence tomography (SD-PS-OCT) system with a single linear-in-wavenumber spectral camera. The system utilizes polarization controllers to ensure polarization state stability and has the ability to iteratively extract the cumulative polarization properties. The reconstructed polarization images demonstrate the effectiveness of the system in extracting local polarization properties.
Article
Optics
XingRong Zhu, Chongjun He, YiYang Wen, Chenguang Deng, Qian Li, Ziyun Chen, Hongbing Chen, Yuangang Lu, Youwen Liu
Summary: A single crystal of Nd-doped lead magnesium niobate titanate (0.74PMN-0.26 PT) was successfully grown using a modified Bridgman approach. The crystal exhibited perovskite structure and showed improved optical properties and dielectric constants. The findings suggest potential applications in various fields.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Xiaorong Gu, Gaowei Wang, Yao Li, Haonan Gong, Yiqiu Liang, Tong Wu, Jiming Wang, Youwen Liu
Summary: In this study, a calcium carbonate birefringent crystal was incorporated into an Er-fiber laser mode-locked by a saturable absorber, resulting in the generation of dual-comb ultrashort pulses with orthogonal polarization. The polarization contrast ratios of the two ultrashort pulse trains were measured to be 30 dB and 20 dB, indicating that the dual-comb mode-locking was achieved through the polarization-multiplexing mechanism. The dual-comb ultrashort pulses had central wavelengths of 1564.41 nm and 1564.51 nm, and pulse durations of 825 fs and 805 fs respectively.
Article
Optics
Jiaqing Liu, Chandong Chen, Xiao LI, Jingwen LI, Daxing Dong, Youwen Liu, Yangyang Fu
Summary: Dual quasi-bound states in continuum (quasi-BICs) enabled by broken geometric symmetry are designed in all-dielectric compound gratings, using the tunable material property of phase-change materials. The even and odd quasi-BICs are modulated by geometric and material asymmetries, respectively, and this effect is ensured by two different types of structural symmetries in the compound structure. Tunable electromagnetically induced transparency (EIT) can be achieved by modulating the material asymmetry. The compound gratings consisting of Sb2Se3 phase-change material are designed and verified through analytical calculations and numerical simulations.
Article
Physics, Multidisciplinary
Jinzhe Liu, Youwen Liu
Summary: This study proposes a perfect narrow-band absorption structure to enhance the interaction between light and monolayer borophene, achieving an absorption efficiency of up to 99.18%. The mechanism of enhanced absorption is verified, and the influence of the dielectric structure's thickness and width on absorption efficiency is analyzed. Additionally, the structure enables the realization of a narrow-band polarization plate or sensor due to its anisotropic optical properties.
ANNALEN DER PHYSIK
(2023)
Article
Optics
Meiling Zhang, Yaoyao Shi, Wei Sheng, Jiaqing Liu, Jingwen Li, Yang Wei, Bin Wang, Dejin Zhang, Youwen Liu
Summary: Non-line-of-sight imaging has attracted great attention for its ability to reconstruct hidden objects. However, it typically requires long data acquisition time using multi-point raster scanning. In this study, we propose an Archimedean spiral scanning method based on confocal non-line-of-sight imaging, which significantly reduces the data acquisition time and achieves high-quality imaging with fewer scanning points. Experimental results show that this method outperforms traditional methods and has potential for real-time non-line-of-sight imaging.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Changdong Chen, Ming Xue, Youwen Liu, Lina Zhao, Yannan Yang, Xiaopeng Hu, Yangyang Fu
Summary: We present an efficient approach to achieve switchable emission by controlling super mode states in a doubly-coupled-ring system. By engineering the coupling rate using phase-change material, the proposed system enables the generation of any desired states in fixed on-chip structures, allowing for switchable and multifunctional emissions. This work offers a promising path towards the development of multifunctional integrated photonic devices.
Article
Physics, Applied
Daxing Dong, Weimian Li, Xiao Li, Jiaqing Liu, Youwen Liu, Hongli Ji, Yadong Xu, Yangyang Fu
Summary: In this study, we demonstrate the trapping, guiding, and manipulation of sound waves in spoof-fluid-spoof acoustic waveguides with gradient index modulation. Through the interaction between propagation waves and spoof surface waves, various functional sound propagation phenomena are observed, including broadband transmission, reflection, resonances, and bound states in the continuum. These effects can be modulated by manipulating the fluid gap and doped defects in the waveguide structure. This research opens up possibilities for manipulating sound waves in different acoustic applications, such as sensing, filtering, insulation, and wavefront engineering.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Guohao Zhang, Jiaqing Liu, Daxing Dong, Changdong Chen, Youwen Liu, Yangyang Fu
Summary: In this work, an efficient approach to controlling the directional excitation of surface plasmon polaritons (SPPs) has been proposed by dynamically modulating the real-part perturbation in a passive parity-time symmetric metasurface. The non-Hermitian system in this study can induce two unidirectional excitation states of SPPs along opposite directions by experiencing two exceptional points. By utilizing the superior modulation depth, the energy ratio and energy intensities of two excited SPP states can be effectively manipulated by this non-Hermitian metasurface.
