A5103005323- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Force Microscopy Techniques and Applications
- Advanced MEMS and NEMS Technologies
- Topological Materials and Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Laser Technologies
- Neural Networks and Reservoir Computing
- Semiconductor Quantum Structures and Devices
- Advancements in Semiconductor Devices and Circuit Design
- Boron and Carbon Nanomaterials Research
- Quantum many-body systems
- Indoor and Outdoor Localization Technologies
- Boron Compounds in Chemistry
- Inertial Sensor and Navigation
- Physics of Superconductivity and Magnetism
- Wireless Networks and Protocols
- Geophysics and Sensor Technology
- Cooperative Communication and Network Coding
- Molecular Communication and Nanonetworks
Sichuan Normal University
2021-2024
Liaoning Normal University
2024
Dalian University of Technology
2015-2023
University of Electronic Science and Technology of China
2023
Nanjing University
2008-2022
Beijing Academy of Quantum Information Sciences
2021-2022
China Aerospace Science and Technology Corporation
2020
Collaborative Innovation Center of Advanced Microstructures
2019
Tiangong University
2017
Beijing University of Chemical Technology
2016-2017
Abstract Here we report a breakthrough in the fabrication of long lifetime transmon qubit. We use tantalum films as base superconductor. By using dry etching process, obtained qubits with best T 1 503 μs. As comparison, also fabricated other popular materials, including niobium and aluminum, under same design processes. After characterizing their coherence properties, found that prepared have performance. Since process is stable highly anisotropic, it much more suitable for fabricating...
A Berry curvature is an imaginary component of the quantum geometric tensor (QGT) and well studied in many branches modern physics; however, metric as a real QGT less explored. Here, by using tunable superconducting circuits, we experimentally demonstrate two methods to directly measure for characterizing geometry topology underlying states parameter space. The first method probe transition probability after sudden quench, second one detect excitation rate under weak periodic driving....
We propose a scheme to enhance entanglement and asymmetric steering between two mechanical oscillators in an optomechanical system with coherent feedback control. In the system, optical cavity interacts auxiliary whose output field is fed back into input port of via loop. Due coherence feedback, we derive effective decay rate nonzero frequency shift cavity. Consequently, induced beam-splitter-type parametric-type interactions are modulated, which leads enhancement generation even if possess...
In the past few years, emerging photon-magnon dissipative coupling offers us an effective way to design and exploit losses fulfill quantum tasks in hybrid cavity magnonics systems. this paper, we theoretically investigate dissipative-coupling-induced transparency (DCIT) enhancement of high-order sidebands a system with Kerr nonlinearity. We find that DCIT can be observed both weak strong driving field. Due existence nonlinearity introduction field magnon, enhanced highly by choosing...
We propose a scheme to achieve the nonreciprocal amplification in hybrid cavity magnonics system. Because of destructive interference between different paths and introduction pumping magnon, can be observed. Owing gain dissipation, with varying parameters, eigenvalues effective Hamiltonian exhibit exceptional points (EPs). investigate relation EPs transmission find that divide parameters regions at which behavior is different; thus help us understand as well optimized parameters.
Abstract We consider collective spontaneous emission from an ensemble of N identical two-level atoms prepared by absorption a single photon–a.k.a. photon Dicke superradiance. discuss dynamical properties superradiance for small (R ≪ λ) and large ≫ atomic cloud. Moreover, we address the effects virtual processes on decay rate Lamb shift. It turns out that lead to relatively yet interesting time evolution rapidly decaying state. However, such substantially modify dynamics trapped states...
We propose a scheme to generate strong squeezing of mechanical oscillator in an optomechanical system through Lyapunov control. Frequency modulation the is designed via show that momentum variance decreases with time evolution weak coupling case. As result, realized quickly (beyond 3 dB). In addition, proposal immune cavity decay. Moreover, we obtained can be detected ancillary mode homodyne detection.
Significant progress has been made in building large-scale superconducting quantum processors based on flip-chip technology. In this work, we use the technology to realize a modified transmon qubit, donated as "flipmon", whose large shunt capacitor is replaced by vacuum-gap parallel plate capacitor. To further reduce qubit footprint, place one of pads and single Josephson junction bottom chip other pad top which galvanically connected with through an indium bump. The electric field...
We propose a scheme to generate the macroscopic entangled Schrödinger cat state of two mechanical resonators in hybrid optomechanical system by introducing modulated photon-hopping interaction between cavities. show that obtained possesses large average phonon number and base vectors which are nearly orthogonal, thus causing high degree entanglement. To justify robust scheme, dissipation noise from environment considered. It shows fidelity target can be achieved presence thermal within our...
Fast, robust two-qubit gate operation with low susceptibility to crosstalk are the key scalable quantum-information processing. A parametrically driven is inherently insensitive crosstalk, while superadiabatic control can speed up without losing accuracy. We propose and experimentally implement gates using parametric modulation on superconducting quantum circuits. Our results demonstrate preservation of adiabaticity at a close limit, in addition robustness against instability. controlled-$Z$...
Abstract In the conventional scheme of generating strong mechanical squeezing by joint effect between parametric amplification and sideband cooling, resolved condition is required so as to overcome quantum backaction heating. unresolved regime, suppress backaction, a χ (2) nonlinear medium introduced cavity. The result shows that heating caused unwanted counter‐rotating term can be completely removed. Hence, obtained even for system far from resolved‐sideband regime.
The simultaneous cooling of multiple mechanical oscillators in the cavity optomechanical system has aroused people's attention and may be applicable quantum information process. In this paper, a scheme to realize ground-state two identical is proposed, where frequency one designed according Lyapunov control. By method, dark mode can effectively couple with bright so that simultaneously cooled their ground state. Extending into oscillators, we show also achieved.
The cavity-magnomechanical system is a significant platform for studying quantum information. In this paper, scheme to realize the ground-state cooling of mechanical phonon mode in proposed. general method, usually driven by strong pumping field, and Hamiltonian needs be linearized. Different from tripartite interaction system, we consider magnetic thermal noise as an incoherent drive facilitate cooling, where magnon number can enhance effective coupling between photon modes. cooled its...