A5022273273- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum Mechanics and Applications
- Neural Networks and Reservoir Computing
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
- Atomic and Subatomic Physics Research
- Orbital Angular Momentum in Optics
- Advanced Thermodynamics and Statistical Mechanics
- Random lasers and scattering media
- Quantum and electron transport phenomena
- Optical Network Technologies
- Advanced Frequency and Time Standards
- Laser-Matter Interactions and Applications
- Photoreceptor and optogenetics research
- Quantum-Dot Cellular Automata
- stochastic dynamics and bifurcation
- Blind Source Separation Techniques
- Advanced Wireless Communication Technologies
- Advanced MRI Techniques and Applications
- Advanced Physical and Chemical Molecular Interactions
- Characterization and Applications of Magnetic Nanoparticles
- Photoacoustic and Ultrasonic Imaging
University of Science and Technology of China
2016-2025
CAS Key Laboratory of Urban Pollutant Conversion
2014-2023
Chinese Academy of Sciences
2018-2023
ORCID
2021
Beijing Academy of Quantum Information Sciences
2020
Chongqing University of Posts and Telecommunications
2017
Centre for Quantum Computation and Communication Technology
2011-2015
Griffith University
2010-2015
Quantum (Australia)
2010-2012
Constructing a quantum memory for photonic entanglement is vital realizing communication and network. Because of the inherent infinite dimension orbital angular momentum (OAM), photon's OAM has potential encoding photon in high-dimensional space, enabling realization high channel capacity communication. Photons entangled orthogonal polarizations or optical paths had been stored different system, but there have no reports on storage pair space. Here, we report first experimental storing an...
There exist real quantum states which can be perfectly distinguished via local operations and classical communication, but cannot with any nonzero probability if one of the parties has no access to imaginarity.
We present a practical and general scheme of remote preparation for pure mixed states, which is proposed with an auxiliary qubit controlled-NOT gate. discuss the state (RSP) in two important types decoherent channel (depolarizing dephasing). realize RSP dephasing our experiment by using spontaneous parametric down-conversion, linear optical elements, single photon detector. Our experimental results match theoretical prediction well.
Abstract A simple yet efficient state reconstruction algorithm of linear regression estimation (LRE) is presented for quantum tomography. In this method, converted into a parameter problem model and the least-squares method employed to estimate unknown parameters. An asymptotic mean squared error (MSE) upper bound all possible states be estimated given analytically, which depends explicitly upon involved measurement bases. This analytical MSE can guide one choose optimal sets. The...
Adaptive techniques have important potential for wide applications in enhancing precision of quantum parameter estimation. We present a recursively adaptive state tomography (RAQST) protocol finite dimensional systems and experimentally implement the on two-qubit systems. In this RAQST protocol, an measurement strategy recursive linear regression estimation algorithm are performed. Numerical results show that our can outperform protocols using mutually unbiased bases (MUB) two-stage MUB even...
Complex numbers are widely used in both classical and quantum physics indispensable components for describing systems their dynamical behavior. Recently, the resource theory of imaginarity has been introduced, allowing a systematic study complex mechanics information theory. In this work we develop theoretical methods imaginarity, motivated by recent progress within theories entanglement coherence. We investigate quantification, focusing on geometric robustness apply these tools to state...
Collective measurements on identically prepared quantum systems can extract more information than local measurements, thereby enhancing information-processing efficiency. Although this nonclassical phenomenon has been known for two decades, it remained a challenging task to demonstrate the advantage of collective in experiments. Here, we introduce general recipe performing deterministic qubits based walks. Using photonic walks, realize experimentally an optimized measurement with fidelity...
Quantum resource theories seek to quantify sources of nonclassicality that bestow quantum technologies their operational advantage. Chief among these are studies correlations and coherence. The former isolates in the between systems, latter captures superpositions within a single physical system. Here, we present scheme cyclically interconverts resources without loss. first stage converts coherence an input system into with ancilla. second harnesses restore on by measurement We...
The precise measurement of a magnetic field is one the most fundamental and important tasks in quantum metrology. Although extensive studies on magnetometry have been carried out over past decades, ultimate precision that can be achieved for estimation all three components under parallel scheme remains unknown. This largely due to lack understandings incompatibility optimal probe states components. Here we provide an approach characterize minimal tradeoff among precisions multiple parameters...
Quantum coherence is a fundamental property of quantum systems, separating from classical physics. Recently, there has been significant interest in the characterization as resource, investigating how can be extracted and used for technological applications. In this work we review progress research, focusing particular on recent experimental efforts. After brief underlying theory discuss main platforms realizing experiments: linear optics, nuclear magnetic resonance, superconducting systems....
Abstract The resource theory of coherence studies the operational value superpositions in quantum technologies. A key question this concerns efficiency manipulation and interconversion resource. Here, we solve completely for qubit states by determining optimal probabilities mixed-state conversions via stochastic incoherent operations. Extending discussion to distributed scenarios, introduce address task assisted state conversion, where process is enhanced making use correlations with a...
The Heisenberg scaling, which scales as ${N}^{\ensuremath{-}1}$ in terms of the number particles or ${T}^{\ensuremath{-}1}$ evolution time, serves a fundamental limit quantum metrology. Better scalings, dubbed ``super-Heisenberg scaling,'' however, can also arise when generator parameter involves many-body interactions it is time dependent. All these different scalings actually be seen manifestations uncertainty relations. While there only one best scaling single-parameter metrology, coexist...
The magneto-optical trap (MOT) is an essential tool for collecting and preparing cold atoms with a wide range of applications. We demonstrate planar-integrated MOT by combining optical grating chip magnetic coil chip. flat simplifies the conventional six-beam configuration down to single laser beam, replaces anti-Helmholtz coils cylindrical geometry. Up ${10}^{6}$ ${}^{87}\mathrm{Rb}$ are trapped MOT, atom cloud being approximately $6\phantom{\rule{0.2em}{0ex}}\mathrm{mm}$ above surface....
Full quantum state tomography (FQST) plays a unique role in the estimation of system without priori knowledge or assumptions. Unfortunately, since FQST requires informationally (over)complete measurements, both number measurement bases and computational complexity data processing suffer an exponential growth with size system. A 14-qubit entangled has already been experimentally prepared ion trap, capability for seems to be far away from practical applications. In this paper, is pushed...
The advantage of quantum metrology has been experimentally demonstrated for phase estimations where the dynamics are commuting. General noncommuting dynamics, however, can have distinct features. For example, direct sequential scheme, which achieve Heisenberg scaling estimation under commuting even worse performances than classical scheme when noncommuting. Here we realize a scalable optimally controlled precision general dynamics. We also present an intuitive geometrical framework and...
Quantum coherence, which quantifies the superposition properties of a quantum state, plays an indispensable role in resource theory. A recent theoretical work [Phys. Rev. Lett. \textbf{116}, 070402 (2016)] studied manipulation coherence bipartite or multipartite systems under protocol Local Incoherent Operation and Classical Communication (LQICC). Here we present first experimental realization obtaining maximal assisted distillation based on linear optical system. The results our show that...
Abstract The dynamics of open quantum systems and manipulation resources are both fundamental interest in physics. Here, we investigate the relation between Markovianity coherence, providing an effective way for detecting non-Markovianity based on quantum-incoherent relative entropy coherence ( $${\mathcal{Q}}{\mathcal{I}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Q</mml:mi><mml:mi>I</mml:mi></mml:mrow></mml:math> REC). We theoretically show completely...
As a ubiquitous aspect of modern information technology, data compression has wide range applications. Therefore, quantum autoencoder which can compress into low-dimensional space is fundamentally important to achieve automatic in the field information. Such be implemented through training parameters device using classical optimization algorithms. In this paper, we demonstrate condition achieving perfect and theoretically prove that losslessly high-dimensional (also called latent space) if...
Experiments demonstrate very high precisions achieved simultaneously for multiple parameters with noncommuting generators.
We report an experimental implementation of a single-qubit generalized measurement scenario, the positive-operator valued measure (POVM), based on quantum walk model. The qubit is encoded in single-photon polarization. photon performs array optical elements, where polarization-dependent translation performed via birefringent beam displacers and change polarization implemented with help wave plates. implement: (i) trine POVM, i.e., POVM elements uniformly distributed equatorial plane Bloch...