A5034703407- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Mechanics and Applications
- Quantum and electron transport phenomena
- Quantum many-body systems
- Atomic and Subatomic Physics Research
- Neural Networks and Reservoir Computing
- Topological Materials and Phenomena
- Quantum, superfluid, helium dynamics
- Mechanical and Optical Resonators
- Spectroscopy and Quantum Chemical Studies
- Nuclear physics research studies
- Diamond and Carbon-based Materials Research
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Laser-Matter Interactions and Applications
- Opinion Dynamics and Social Influence
- Strong Light-Matter Interactions
- Nuclear Physics and Applications
- Graphene research and applications
- Astronomical and nuclear sciences
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
Tsinghua University
2016-2025
Hefei University
2022-2025
Beijing University of Posts and Telecommunications
2024
ShangHai JiAi Genetics & IVF Institute
2024
Institute of Modern Physics
2002-2021
University of Chinese Academy of Sciences
2020-2021
Chinese Academy of Sciences
2006-2021
University of Michigan
2009-2018
Joint Quantum Institute
2009
University of Maryland, College Park
2009
We propose a scheme for scalable photonic quantum computation based on cavity assisted interaction between single-photon pulses. The prototypical controlled phase-flip gate the pulses is achieved by successively reflecting them from an optical with single-trapped atom. Our proposed protocol shown to be robust practical nose and experimental imperfections in current cavity-QED setups.
The practical construction of scalable quantum-computer hardware capable executing nontrivial quantum algorithms will require the juxtaposition different types systems. We analyze a modular ion trap architecture with hierarchy interactions that can scale to very large numbers qubits. Local entangling gates between qubit memories within single register are accomplished using natural qubits, and entanglement separate registers is completed via probabilistic photonic interface qubits in...
Quantum teleportation is the faithful transfer of quantum states between systems, relying on prior establishment entanglement and using only classical communication during transmission. We report information atomic memories separated by about 1 meter. A bit stored in a single trapped ytterbium ion (Yb+) teleported to second Yb+ atom with an average fidelity 90% over replete set states. The protocol based heralded atoms through interference detection photons emitted from each guided optical...
We show how to efficiently simulate a quantum many-body system with tree structure when its entanglement (Schmidt number) is small for any bipartite split along an edge of the tree. As application, we that one-way computation on graph can be simulated classical computer.
We propose a method to generate and detect large quantum superposition states arbitrary Fock for the oscillational mode of an optically levitated nanocrystal diamond. The nonlinear interaction required generation non-Gaussian is enabled through spin-mechanical coupling with built-in nitrogen-vacancy center inside nanodiamond. proposed allows superpositions nanoparticles millions atoms observation associated spatial interference under reasonable experimental conditions.
The marriage of the two fields may give birth to a new research frontier that could transform them both.
We propose a scheme to achieve quantum computation with neutral atoms whose interactions are catalyzed by single photons. Conditional gates, including an $N$-atom Toffoli gate and nonlocal gates on remote atoms, obtained through cavity-assisted photon scattering in manner that is robust random variation the atom-photon coupling rate which does not require localization Lamb-Dicke regime. The dominant noise our automatically detected for each operation, leading signalled errors do preclude...
We propose a scheme to implement quantum gates on any pair of trapped ions immersed in large linear crystal, using interaction mediated by the transverse phonon modes. Compared with conventional approaches based longitudinal modes, this is much less sensitive ion heating and thermal motion outside Lamb-Dicke limit thanks stronger confinement direction. The cost for such gain only moderate increase laser power achieve same gate speed. also show how realize arbitrary-speed modes simple shaping pulses.
Spontaneous symmetry breaking can lead to the formation of time crystals, as well spatial crystals. Here we propose a space-time crystal trapped ions and method realize it experimentally by confining in ring-shaped trapping potential with static magnetic field. The spontaneously form ring due Coulomb repulsion. This ion rotate persistently at lowest quantum energy state fields fractional fluxes. persistent rotation produces temporal order, leading crystal. We show that these crystals are...
With a combination of the quantum repeater and cluster state approaches, we show that efficient computation can be constructed even if all entangling gates only succeed with an arbitrarily small probability p. The required computational overhead scales efficiently both 1/p n, where n is number qubits in computation. This approach provides way to combat noise class implementation schemes, dominant leads probabilistic signaled errors error 1-p far beyond any threshold requirement.
We demonstrate entangling quantum gates within a chain of five trapped ion qubits by optimally shaping optical fields that couple to multiple collective modes motion. individually address with segmented pulses construct multipartite entangled states in programmable way. This approach enables high-fidelity can be scaled larger qubit registers for computation and simulation.
The electron spin state of a singly charged semiconductor quantum dot has been shown to form suitable single qubit for computing architectures with fast gate times. A key challenge in realizing useful architecture lies demonstrating the ability scale system many qubits. In this Letter, we report an all optical experimental demonstration entanglement between confined and polarization photon spontaneously emitted from dot's excited state. We obtain lower bound on fidelity...
We propose a quantum learning algorithm for generative model and prove its advantages compared with classical models.
This work uncovers the vulnerability aspect for quantum machine learning, by showing that classifiers are vulnerable to adversarial perturbations. The authors give generic recipes on how generate perturbations and mitigate problem in various scenarios.
Dynamical quantum phase transitions are closely related to equilibrium for ground states. Here, we report an experimental observation of a dynamical transition in spinor condensate with correspondence excited state diagram, instead the one. We observe that quench dynamics exhibits non-analytical change respect parameter final Hamiltonian absence corresponding there. make connection between this singular point and highest energy level subspace zero spin magnetization Hamiltonian. further show...
Controllable interaction between superconducting qubits is desirable for large-scale quantum computation and simulation. Here, based on a theoretical proposal by Yan et al. [Phys. Rev. Appl. 10, 054061 (2018)] we experimentally demonstrate simply-designed flux-controlled tunable coupler with continuous tunability adjusting the frequency, which can completely turn off adjacent qubit coupling. Utilizing two via coupler, implement different type of controlled-phase (CZ) gate 'dynamically...
We study disorder effects in a two-dimensional system with chiral symmetry and find that can induce quadrupole topological insulating phase (a higher-order moments) from topologically trivial phase. Their properties manifest invariant defined based on effective boundary Hamiltonians, the moment, zero-energy corner modes. gapped gapless phases Griffiths regime. In phase, all states are localized, while regime, at zero energy become multifractal. further apply self-consistent Born...
We study amorphous systems with completely random sites and find that, through constructing exploring a concrete model Hamiltonian, such system can host an exotic phase of topological metal in three dimensions. In contrast to the traditional Weyl semimetals, metals break translational symmetry, thus they cannot be characterized by first Chern number defined based on momentum space band structures. Instead, their properties will manifest Bott index Hall conductivity as well surface states. By...
A new $\alpha$-emitting isotope $^{214}$U, produced by fusion-evaporation reaction $^{182}$W($^{36}$Ar, 4n)$^{214}$U, was identified employing the gas-filled recoil separator SHANS and recoil-$\alpha$ correlation technique. More precise $\alpha$-decay properties of even-even nuclei $^{216,218}$U were also measured in reactions $^{40}$Ar, $^{40}$Ca with $^{180, 182, 184}$W targets. By combining experimental data, improved reduced widths $\delta^2$ for Po--Pu vicinity magic neutron number...
Schrödinger’s cat originates from the famous thought experiment querying counterintuitive quantum superposition of macroscopic objects. As a natural extension, several “cats” (quasi-classical objects) can be prepared into coherent states, which is known as multipartite states demonstrating entanglement among macroscopically distinct Here, we present highly scalable approach to deterministically create flying by reflecting coherent-state photons microwave cavity containing superconducting...