A5030159743- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Neural Networks and Reservoir Computing
- Quantum-Dot Cellular Automata
- Quantum Mechanics and Non-Hermitian Physics
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Quantum many-body systems
- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Mechanical and Optical Resonators
- Advanced Thermodynamics and Statistical Mechanics
- Quantum chaos and dynamical systems
- Smart Materials for Construction
- Environmental Impact and Sustainability
- Photorefractive and Nonlinear Optics
- Nanopore and Nanochannel Transport Studies
- China's Ethnic Minorities and Relations
- Thermal Radiation and Cooling Technologies
- Ethics and Social Impacts of AI
- Advanced Fluorescence Microscopy Techniques
- Nonlinear Photonic Systems
- Web Application Security Vulnerabilities
- Machine Learning and Data Classification
Southeast University
2014-2025
Peking University
2025
Nanjing University of Science and Technology
2019-2024
Nanjing Medical University
2021
Beijing Computational Science Research Center
2018-2020
Beijing Institute of Technology
2020
Shanghai University
2011
Tiangong University
2010
We report the experimental detection of bulk topological invariants in nonunitary discrete-time quantum walks with single photons. The nonunitarity dynamics is enforced by periodically performing partial measurements on polarization walker photon, which effectively introduces loss to dynamics. invariant walk manifested quantized average displacement walker, probed monitoring photon loss. confirm properties system observing localized edge states at boundary regions different invariants....
Signaled by non-analyticities in the time evolution of physical observables, dynamic quantum phase transitions (DQPTs) emerge quench dynamics topological systems and possess an interesting geometric origin captured order parameters (DTOPs). In this work, we report experimental study DQPTs using discrete-time walks single photons. We simulate between distinct Floquet phases quantum-walk dynamics, experimentally characterize underlying DTOPs through interference-based measurements. The...
We experimentally simulate nonunitary quantum dynamics using a single-photon interferometric network and study the information flow between parity-time- (PT-)symmetric non-Hermitian system its environment. observe oscillations of quantum-state distinguishability complete retrieval in PT-symmetry-unbroken regime. then characterize detail critical phenomena near exceptional point separating PT-unbroken PT-broken regimes, demonstrate power-law behavior key quantities such as recurrence time....
Topology in quench dynamics gives rise to intriguing dynamic topological phenomena, which are intimately connected the topology of static Hamiltonians yet challenging probe experimentally. Here we theoretically characterize and experimentally detect momentum-time skyrmions parity-time [Formula: see text]-symmetric non-unitary single-photon discrete-time quantum walks. The emergent skyrmion structures protected by Chern numbers defined for two-dimensional submanifolds, revealed through our...
We demonstrate a quantum walk with time-dependent coin bias. With this technique we realize an experimental single-photon one-dimensional linearly-ramped flip operation and thereby two periodic revivals of the walker distribution. In our beam-displacer interferometer, corresponds to movement between discretely separated transverse modes field serving as lattice sites, is effected by implementing different angle optical axis half-wave plate light propagation at each step. Each quantum-walk...
We perform generalized measurements of a qubit by realizing the as coin in photonic quantum walk and subjecting walker to projective measurements. Our experimental technique can be used realize, photonically, any rank-1 single-qubit positive-operator-valued measure via constructing an appropriate interferometric quantum-walk network then projectively measuring walker's position at final step.
We show a perfect state transfer of an arbitrary unknown two-qubit can be achieved via discrete-time quantum walk with various settings coin flippings, and extend this method to distribution multi-qubit entangled between every pair sites in the multi-dimensional network. Furthermore, we study routing information on network architecture, which used as processors communicate separated qubits.
Quantum metrology overcomes standard precision limits and plays a central role in science technology. Practically, it is vulnerable to imperfections such as decoherence. Here we demonstrate quantum for noisy channels that entanglement with ancillary qubits enhances the Fisher information phase estimation but not otherwise. Our photonic experiment covers range of noise various types channels, including two randomly alternating assisted fails each channel individually. We simulate by...
The Heisenberg-Robertson uncertainty relation quantitatively expresses the impossibility of jointly sharp preparation incompatible observables. However it does not capture concept observables because can be trivial even for two We experimentally demonstrate new stronger relations proposed by Maccone and Pati [Phys. Rev. Lett. 113, 260401 (2014)] relating on that sum variances are valid in a state-dependent manner lower bound is guaranteed to nontrivial being state system measured. behaviour...
We report our experimental results on the no-disturbance principle, which imposes a fundamental monogamy relation contextuality versus nonlocality. employ photonic qutrit-qubit hybrid to explore at quantum boundary spanned by noncontextuality and locality inequalities. In particular, we realize single point where meets boundary. Our agree with theory satisfy stringent thereby providing direct evidence of tradeoff between locally contextual correlations spatially separated correlations. Thus,...
Quantum measurements play a fundamental role in quantum mechanics. Especially, generalized provide powerful and versatile tool to extract information from systems. However, how realize them on an arbitrary higher-dimensional system remains challenging task. Here we propose simple recipe for the implementation of general positive-operator valued measurement (POVM) via one-dimensional discrete-time walk with two-dimensional coin. Furthermore, using single photons linear optics, experimentally...
Network centrality has important implications well beyond its role in physical and information transport analysis; as such, various quantum walk-based algorithms have been proposed for measuring network vertex centrality. In this work, we propose a continuous-time walk algorithm determining centrality, show that it generalizes to arbitrary graphs via statistical analysis of randomly generated scale-free Erd\H{o}s-R\'enyi networks. As proof concept, the is detailed on 4-vertex star graph...
Topological matter exhibits exotic properties yet phases characterized by large topological invariants are difficult to implement, despite rapid experimental progress. A promising route toward higher is via engineered Floquet systems, particularly in photonics, where flexible control holds the potential of extending study conventional novel regimes. Here we implement a one-dimensional photonic quantum walk explore winding numbers. By introducing partial measurements and hence loss into...
This work presents an analytical solution to the problem of conservation laws in open systems. The authors simulate quantum dynamics 4-site parity-time-symmetric lattice with a fourth-order exceptional point by using single-photon interferometry setup.
Testing quantum theory on macroscopic scales is a longstanding challenge whose solution could have significant impact physics. For example, laboratory tests (such as those anticipated in nanomechanical or biological systems) may look to rule out realism: the idea that properties of objects exist objectively and can be noninvasively measured. Such investigations are likely suffer from (i) stringent experimental requirements, (ii) marginal statistical significance, (iii) logical loopholes. We...
Deterministically cloning (copying) nonorthogonal states is forbidden in quantum mechanics, but deterministic pseudo-unitary possible a nonunitary system. We prove and show that, for any two qubit states, we can find linear, invertible Hermitian (metric) operator to make these mutually orthogonal with respect the corresponding pseudo-inner product. From this metric operator, construct pseudo-Hermitian Hamiltonian its evolution as an ideal, cloner. For applicability, suppose Alice lives our...
Cellular membranes orchestrate critical processes such as molecular transport and signal transduction, both regulated by the lateral mobility of lipids proteins. However, resolving nanoscale diffusional heterogeneities elucidating their underlying mechanisms remains a formidable challenge due to membrane's intricate architecture compositional diversity. Here, we present point-cloud single-molecule diffusivity mapping (pc-SMdM), cutting-edge super-resolution technique that offers data format...
Leggett-Garg inequalities are tests of macroscopic realism that can be violated by quantum mechanics. In this letter, we realise photonic on a three-level system and implement measurements admit three distinct measurement outcomes, rather than the usual two. way obtain violations three- four-time significantly in excess those obtainable standard tests. We also report quantum-witness equality up to maximum permitted for three-outcome measurement. Our results highlight differences between...
We experimentally implement a quantum walk on circle in position space. Using different arrangement of linear optical elements, our experiment realizes clockwise-cycling and counterclockwise-cycling walks. Periodic evolutions walks three- four-node circles with uniform coin flipping for each step localized initial walker state are observed, the full revival walker+coin occurs. Coherent information encoded shows periodic collapse due to interaction between walker. The technology realize can...
Uncertainty relations are the hallmarks of quantum physics and have been widely investigated since its original formulation. To understand quantitatively capture essence preparation uncertainty in interference, for unitary operators need to be investigated. Here, we report first experimental investigation general operators. In particular, experimentally demonstrate relation proved by Bagchi Pati [ Phys. Rev. A94, 042104 (2016)], which places a non-trivial lower bound on sum uncertainties...
We realize a pair of simultaneous ten-step one-dimensional quantum walks with two walkers sharing coins, which we prove is analogous to the two-dimensional walk single walker holding four-dimensional coin. Our experiment demonstrates over an $11\ifmmode\times\else\texttimes\fi{}11$ lattice line defect, thereby realizing localized state.
Contextuality is a phenomenon at the heart of quantum mechanical departure from classical behaviour, and has been recently identified as resource in computation. Experimental demonstration contextuality thus an important goal. The traditional form -- violation Kochen-Specker inequality requires system with least three levels, status assumption determinism used deriving those inequalities controversial. By considering `unsharp' observables, Liang, Spekkens Wiseman (LSW) derived for...