A5032000848- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Topological Materials and Phenomena
- Quantum many-body systems
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Fluorescence Microscopy Techniques
- Advanced Frequency and Time Standards
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum chaos and dynamical systems
- Solid State Laser Technologies
- Random lasers and scattering media
- Photoacoustic and Ultrasonic Imaging
- Bacterial Identification and Susceptibility Testing
- Quantum Electrodynamics and Casimir Effect
- Digital Holography and Microscopy
- Laser-Matter Interactions and Applications
- Optical Coherence Tomography Applications
- MXene and MAX Phase Materials
- Graph theory and applications
- Advanced X-ray Imaging Techniques
University of Science and Technology of China
2018-2023
Chinese University of Hong Kong
2023
Chinese Academy of Sciences
2018
CAS Key Laboratory of Urban Pollutant Conversion
2018
Quantum computation with quantum gates induced by geometric phases is regarded as a promising strategy in fault-tolerant computation, owing to its robustness against operational noise. However, because of the parametric restrictions previous schemes, main robust advantage holonomic reduced. Here, we experimentally demonstrate solution scheme, obtaining nonadiabatic single-qubit optimal control trapped ${}^{171}{\mathrm{Yb}}^{+}$ ion based on three-level system resonant driving, which also...
The discovery of ferromagnetism in two-dimensional (2D) van der Waals crystals has generated widespread interest. seeking robust 2D ferromagnets with high Curie temperature (Tc) is vitally important for next-generation spintronic devices. However, owing to the enhanced spin fluctuation and weak exchange interaction upon reduced dimensionalities, exploring Tc > 300 K highly demanded but remains challenging. In this work, we fabricated air-stable Cr5Te8/CrTe2 vertical heterojunctions above 400...
We present a laser machining method for fabricating an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI), which is used strain sensors with high sensitivity. The micro-structure of the air-bubble fully controllable, especially cavity length and sidewall thickness. measured sensitivity this sensor as 56.69 pm/με, several times higher than that most FPI reported to date. This also has low-temperature 0.682 pm/°C, reducing cross-sensitivity between tensile temperature 0.012 με/°C....
For circuit-based quantum computation, experimental implementation of a universal set logic gates with high-fidelity and strong robustness is essential central. Quantum induced by geometric phases, which depend only on global properties the evolution paths, have built-in noise-resilience features. Here, we propose experimentally demonstrate nonadiabatic holonomic single-qubit two dark paths in trapped
The Kibble-Zurek (KZ) mechanism is a universal framework that can in principle describe nonequilibrium phase transition phenomena any system with the required symmetry properties. However, conflicting phenomenon termed anti-KZ behavior has been reported study of ferroelectric transitions, which slower driving results more topological defects [S. M. Griffin et al., Phys. Rev. X 2, 041022 (2012)]. Although this finding significant, related experimental work remains scarce. In work, we...
In cold atomic systems, fast and high-resolution microscopy of individual atoms is crucial, since it can provide direct information on the dynamics correlations system. Here, we demonstrate nanosecond-scale two-dimensional stroboscopic pictures a single trapped ion beyond optical diffraction limit, by combining main idea ground-state depletion with quantum-state transition control in atoms. We achieve spatial resolution up to 175 nm using NA=0.1 objective experiment, which represents more...
Abstract Self-testing allows one to characterise quantum systems under minimal assumptions. However, existing schemes rely on nonlocality and cannot be applied that are not entangled. Here, we introduce a robust method achieves self-testing of individual by taking advantage contextuality. The scheme is based the simplest contextuality witness for contextual system—the Klyachko-Can-Binicioğlu-Shumovsky inequality qutrit. We establish lower bound fidelity state measurements as function value...
Abstract The non-trivial zeros of the Riemann zeta function are central objects in number theory. In particular, they enable one to reproduce prime numbers. They have also attracted attention physicists working random matrix theory and quantum chaos for decades. Here we present an experimental observation lowest by using a trapped-ion qubit Paul trap, periodically driven with microwave fields. waveform driving is engineered such that dynamics ion frozen when parameters coincide zero real...
An experiment provides an important step towards understanding the relation between dynamical quantum phase transitions and Kibble-Zurek mechanism. These results provide insight into topological aspects of nonequilibrium dynamics.
Optical controls provided by lasers are the most important and essential techniques in trapped ion cold atom systems. It is crucial to increase optical accessibility of setup enhance these capabilities. Here, we present design construction a new segmented-blade trap integrated with compact glass vacuum cell, place conventional bulky metal chamber. The distance between four outside surfaces cell 15 mm, which enables us install high-numerical-aperture (NA) lenses (with two NA ⩽ 0.32 0.66...
We demonstrate a type of microcavity with large tunable splitting polarization modes. This nondegenerate cavity consists two ellipsoidal concave mirrors controllable eccentricity by CO2 laser machining on fiber end facets. The experiment shows that the cavities can combine advantages high finesse above 104 and mode to GHz range. As be finely controlled match atom hyperfine levels or optomechanics phonons, it will blaze way in experiments quantum electrodynamics optomechanics.
We demonstrate a laser frequency stabilization method with large tuning range to stabilize UV by installing piezoelectric ceramic actuators into Fabry–Pérot cavity an ultra-low expansion spacer. To suppress drift, two-layer symmetrical structure is adopted for the actuator, and 14.7 GHz achieved. The short-term drift of ceramics caused temperature creep eliminated, long-term 0.268 MHz/h when sealed in chamber without vacuum environment. mainly stress release eliminated compensating voltage...
For circuit-based quantum computation, experimental implementation of universal set logic gates with high-fidelity and strong robustness is essential central. Quantum induced by geometric phases, which depend only on global properties the evolution paths, have built-in noise-resilience features. Here, we propose experimentally demonstrate nonadiabatic holonomic single-qubit two dark paths in a trapped $^{171}\mathrm{Yb}^{+}$ ion based four-level systems resonant drives. We confirm measured...
Materials with AV$_3$Sb$_5$ (A=K, Rb, Cs) stoichiometry are recently discovered kagome superconductors the electronic structure featuring a Dirac band, van Hove singularities and flat bands. These systems undergo anomalous charge-density-wave (CDW) transitions at $T_{\rm CDW}$~80-100 K, resulting in reconstruction of Fermi surface from pristine phase. Although comprehensive investigations via quantum oscillations (QOs) have been performed on sister compounds CsV$_3$Sb$_5$ RbV$_3$Sb$_5$,...
Robust and high-precision quantum control is crucial but challenging for scalable computation information processing. Traditional adiabatic suffers severe limitations on gate performance imposed by environmentally induced noise because of a system's limited coherence time. In this work, we experimentally demonstrate an alternative approach {to control} based deep reinforcement learning (DRL) trapped $^{171}\mathrm{Yb}^{+}$ ion. particular, find that DRL leads to fast robust {digital...
The Riemann hypothesis, one of the most important open problems in pure mathematics, implies profound secret prime numbers. One interesting approaches to solving this hypothesis is connect problem with spectrum physical Hamiltonian a quantum system. However, none proposed Hamiltonians has been experimentally feasible. Here we report an experiment using Floquet method identify first nontrivial zero $\ensuremath{\zeta}$ function and two zeros P\'olya's function. Through properly designed...
To overcome the phototoxicity in diamond-based bio-sensing, we applied light sheet microscopy to optically detected magnetic resonance measurement. Three-dimensional imaging and nano-thermometry with sensitivity ~3 K/Hz are achieved.
Certifying individual quantum devices with minimal assumptions is crucial for the development of technologies. Here, we investigate how to leverage single-system contextuality realize self-testing. We develop a robust self-testing protocol based on simplest witness contextual system, Klyachko-Can-Binicio\u{g}lu-Shumovsky (KCBS) inequality qutrit. establish lower bound fidelity state and measurements (to an ideal configuration) as function value under pragmatic assumption call KCBS...
The quantum walk, as the analog of classical random provides a feasible platform to study topological phenomenon and nonequilibrium dynamics. Here we propose scheme realize walk with single trapped ion where Fock states space zero-phonon state $|n=0\ensuremath{\rangle}$ serves its natural boundary. Thus, our offers an opportunity investigate dynamics bound corresponding systems. In particular, quench can be extensively studied by tuning bulk parameters local boundary operator, which are...
Algorithms for wavefront sensing and error correction from intensity attract great concern in many fields. Here we propose Bayesian optimization to retrieve phase demonstrate its performance simulation experiment. For small aberration, this method demonstrates a convergence process with high accuracy of sensing, which is also verified experimentally. large shown be insensitive the initial while maintaining accuracy. The approach’s merits robustness make it promising being applied optical...
Materials with AV$_3$Sb$_5$ (A=K, Rb, Cs) stoichiometry are recently discovered kagome superconductors the electronic structure featuring a Dirac band, van Hove singularities and flat bands. These systems undergo anomalous charge-density-wave (CDW) transitions at $T_{\rm CDW}$~80-100 K, resulting in reconstruction of Fermi surface from pristine phase. Although comprehensive investigations via quantum oscillations (QOs) have been performed on sister compounds CsV$_3$Sb$_5$ RbV$_3$Sb$_5$,...