A5039045644- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Frequency and Time Standards
- Analytical Chemistry and Sensors
- Advanced Fiber Laser Technologies
- Quantum Computing Algorithms and Architecture
- Quantum many-body systems
- Scientific Measurement and Uncertainty Evaluation
- Mechanical and Optical Resonators
- Mass Spectrometry Techniques and Applications
- Quantum chaos and dynamical systems
- Hemodynamic Monitoring and Therapy
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Atomic and Molecular Physics
- Electrochemical Analysis and Applications
- Quantum and electron transport phenomena
- Chemical and Physical Properties in Aqueous Solutions
- Strong Light-Matter Interactions
- Molecular Junctions and Nanostructures
- Dust and Plasma Wave Phenomena
Jinggangshan University
2025
Hefei University
2023
National University of Defense Technology
2014-2023
Wuhan Institute of Physics and Mathematics
2011-2012
Chinese Academy of Sciences
2011-2012
University at Buffalo, State University of New York
2011
Parity-time ($\mathcal{PT}$)-symmetric systems, featuring real eigenvalues despite their non-Hermitian nature, undergo spontaneous $\mathcal{PT}$ symmetry breaking at the exceptional point (EP). The phase transition from to has shown exotic functionalities in classical realm, such as loss-induced transparency or lasing revival. This is also expected produce a more unconventional effect pure quantum devices. Here, we report experimental evidences of single cold $^{40}\mathrm{Ca}^{+}$ ion and,...
We demonstrate an experiment for remote preparation of arbitrary photon polarization states. With local operations, measurement, and one way classical communication, any states lying on inside the Poincar\'e sphere can be remotely prepared. For pure states, efficiency is 100% with a communication cost entanglement bit two bits. mixed insensitive measurement introduced bit. Spontaneous parametric down-conversion (SPDC) employed as source. The prepared qubits are estimated via quantum...
We report a frequency measurement of the clock transition single ^40Ca^+ ion trapped and laser cooled in miniature ring Paul trap with 10^-15 level uncertainty. In measurement, we used an optical comb referenced to Hydrogen maser, which was calibrated SI second through Global Positioning System (GPS). Two rounds measurements were taken May June 2011, respectively. The measured be 411 042 129 776 393.0(1.6) Hz fractional uncertainty 3.9{\times}10^-15 total averaging time > 2{\times}10^6 s...
The ability of achieving strong quantum spatial correlations has helped the emergence information science. In contrast, how to achieve temporal (QTCs) remained as a long-standing challenge, thus hindering their applications in time-domain control. Here we experimentally demonstrate that by using parity-time (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi mathvariant="script">PT</a:mi></a:math>)–symmetric single ion, conventional QTC limit known Lüders bound can be well surpassed...
Abstract Cryogenic ion traps offer substantial benefits over their room-temperature counterparts, particularly in terms of stable confinement and cooling. However, this technological growth introduces a significant challenge: the generation additional vibrational noise. This noise is most pronounced during compression expansion phases Gifford-McMahon cyclic refrigerator (GMCR) stems from mechanical operations cold head. Residual can modulate Rabi oscillation frequency, thereby compromising...
Progress on the evaluation of systematic frequency shifts is described in development optical standard based single-trapped ${}^{40}$Ca${}^{+}$ with a ``clock'' transition at 729 nm. The overall uncertainty 4$s$ ${}^{2}$$\phantom{\rule{-0.16em}{0ex}}{S}_{1/2}$-3$d$ ${}^{2}$$\phantom{\rule{-0.16em}{0ex}}{D}_{5/2}$ clock resonance has been characterized to be 7.8 \ifmmode\times\else\texttimes\fi{} 10${}^{\ensuremath{-}16}$. This level similar Cs fountain primary standard, while potential...
In this paper, we explore the possibilities of realizing weak value amplification (WVA) using purely atomic degrees freedom. Our scheme identifies internal electronic states and external motional a single trapped $^{40}\mathrm{Ca}^{+}$ ion as system degree pointer degree, respectively, their controllable coupling is provided by bichromatic light field. our experimental demonstration, performing appropriate postselection on states, position displacement $\ensuremath{\sim}4\AA{}$ (in phase...
We theoretically propose and experimentally demonstrate a parallel electromagnetically induced transparency (parallel EIT) cooling technique for ion crystals in the Paul trap. It breaks stringent requirements of standard EIT cooling, thus allowing, principle, to simultaneously cool motional mode spectrum with an arbitrary range. Experimentally large range over 5 MHz is proved by using single trapped ${}^{40}{\mathrm{Ca}}^{+}$ ion. also observe simultaneous near-ground-state all modes 4-ion...
Cryogenic trapped-ion systems (CTISs) have emerged as indispensable platforms for the advancement of quantum computation and precision measurement techniques. However, sensitivity these to vibrational noise, especially during compression expansion cycles cold head in a Gifford-McMahon cycle refrigerator (GMCR), poses significant challenge. To mitigate this, we crafted an innovative methodology characterizing low-frequency residual noise closed-cycle cryogenic systems. Our is underpinned by...
A feedback control method for producing an equidistant ion string in a surface-electrode trap has been experimentally demonstrated. This features three advantages: (i) The optimal voltage can be constrained within the specified reachable range. (ii) height of trapped ions from surface maintained at same value when strings with different number or spacings are to trapped. (iii) is resistant stray electric field near trap. By this method, asymmetry caused by minimized. robustness trapping...
The optical frequency of the 4s2S1/2-3d2D5/2 transition in a single trapped and laser-cooled 40Ca+ ion is measured with an comb system referenced to hydrogen maser. A 729-nm laser can be locked clock about ten hours Allan deviation better than 2 × 10−14/1000 s.
Quantitative prediction and understanding of driver speed control is important to prevent speeding behavior design vehicle systems. Speed a complex longitudinal control, involving perception, decision making (setting target speed), motor (foot movement for pedal control), mechanics. However, few existing models able cover all these aspects together. To address this problem, the current work built new mathematical model with analytical solutions based on rigorous human cognitive mechanisms in...
Adiabatic quantum computing (AQC) is an approach for solving optimization problems and has advantages against environmental decoherence certain kinds of random unitary perturbations; however, long coherence time systems required to meet the adiabatic criteria implementation AQC. To break dilemma evolution in AQC, method shortcuts adiabaticity (STA) employed speed up process suppress nonadiabatic transitions. In this work we demonstrate application STA AQC by implementing a fast two-bit...
The resonance fluorescence spectra of a laser-driven four-level closed-loop diamond-shape atomic system are investigated in this paper. four decay channels the interfere with each other different ways according to several distinct arrangements two intermediate levels, and hence produce spontaneously generated coherence (SGC) effects. numerical calculation shows that amplitude, linewidth number sidebands spectrum deeply modified by SGC effects; accordingly, interesting effects such as...
Quantum correlations, both spatial and temporal, are the central pillars of quantum mechanics. Over last two decades, a big breakthrough in physics is its complex extension to non-Hermitian realm, dizzying varieties novel phenomena applications beyond Hermitian framework have been uncovered. However, unique features especially time domain, still remain be explored. Here, for first time, we experimentally achieve this goal by using parity-time (PT )-symmetric trapped-ion system. The upper...