A5026174955- Quantum Information and Cryptography
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Optical Network Technologies
- Quantum and electron transport phenomena
- Neural Networks and Reservoir Computing
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Non-Hermitian Physics
- Spectroscopy and Quantum Chemical Studies
- Force Microscopy Techniques and Applications
- Cryptography and Data Security
- Statistical Mechanics and Entropy
- Orbital Angular Momentum in Optics
- Image Processing Techniques and Applications
- Quantum-Dot Cellular Automata
- Molecular Junctions and Nanostructures
- Neural dynamics and brain function
- Photonic and Optical Devices
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Fluorescence Microscopy Techniques
Peking University
2020-2023
Pohang University of Science and Technology
2023
Beijing Academy of Quantum Information Sciences
2021-2022
Korea Institute of Science & Technology Information
2017-2022
Korea Institute of Science and Technology
2017-2022
Collaborative Innovation Center of Quantum Matter
2020-2022
S.N. Bose National Centre for Basic Sciences
2010-2017
Laboratoire Traitement et Communication de l’Information
2014-2017
Télécom Paris
2014-2017
Korean Association Of Science and Technology Studies
2017
Abstract Graphs have provided an expressive mathematical tool to model quantum-mechanical devices and systems. In particular, it has been recently discovered that graph theory can be used describe design quantum components, devices, setups systems, based on the two-dimensional lattice of parametric nonlinear optical crystals linear circuits, different standard photonic framework. Realizing such graph-theoretical hardware, however, remains extremely challenging experimentally using...
A bipartite state is said to be steerable if and only it does not have a single-system description, i.e., the cannot explained by local hidden model. Several steering inequalities been derived using different uncertainty relations verify ability control of one subsystem other party. Here, we derive complementarity between coherences measured on mutually unbiased bases various coherence measures such as ${l}_{1}$-norm, relative entropy, skew information. Using these relations, conditions...
We derive a steering inequality based on fine-grained uncertainty relation to capture Einstein-Podolsky-Rosen for bipartite systems. Our improves over previous ones since it can experimentally detect all steerable two-qubit Werner state with only two measurement settings each side. According our inequality, pure entangled states are maximally steerable. Moreover, by slightly changing the setting, we express amount of violation as function their Clauser-Horne-Shimony-Holt inequality. Finally,...
The limitation on obtaining precise outcomes of measurements performed two noncommuting observables a particle as set by the uncertainty principle in its entropic form can be reduced presence quantum memory. We derive new relation based fine graining, which leads to an ultimate limit precision achievable incompatible show that our derived tightens lower bound for members class two-qubit states with maximally mixed marginals, while accounting recent experimental results using entangled pure...
In view of the increasing importance non-Gaussian entangled states in quantum information protocols like teleportation and violations Bell inequalities, steering continuous variable is investigated. Einstein-Podolsky-Rosen for Gaussian may be demonstrated through violation Reid inequality involving products inferred variances noncommuting observables. However, arbitrary not always necessary because higher-order correlations such states. One then needs to use entropic inequality. We examine...
Quantum correlation is a fundamental resource for various quantum information tasks. It thus of importance to share the utilize it many parties, but sharing among multiple parties strictly restricted by well-known monogamy relations. Nonetheless, this restriction can be relaxed when weak measurements are employed. Here, we experimentally demonstrate multiple-observer steering exploiting sequential measurements. Specifically, observe simultaneous triple violations inequality four observers...
Abstract Bohr’s complementarity is one central tenet of quantum physics. The paradoxical wave-particle duality matters and photons has been tested in Young’s double-slit (double-path) interferometers. object exclusively exhibits wave particle nature, depending measurement apparatus that can be delayed chosen to rule out too-naive interpretations complementarity. All experiments date have implemented the double-path framework, while it fundamental interest study multipath interferometric...
Nonlocal quantum correlation is at the heart of bizarre nature physics. While there are various classes nonlocal correlation, steerability a state by local measurements provides unique operational features. Here, we theoretically and experimentally investigate ``hidden'' property steerability. In particular, find that initially unsteerable states which can reveal using filters on individual systems. It remarkable certain set more effective in revealing than Bell nonlocality whereas exists...
Particle identity and entanglement are two fundamental quantum properties that work as major resources for various information tasks. However, it is still a challenging problem to understand the correlation of in same system. While recent theoretical studies have shown spatial overlap between identical particles necessary nontrivial entanglement, exact role particle indistinguishability has never been analyzed quantitatively before. Here, we theoretically experimentally investigate behavior...
We show that the uncertainty relation as expressed in Robertson-Schrodinger generalized form can be used to detect mixedness of three-level quantum systems terms measureable expectation values suitably chosen observables when prior knowledge about basis given state is known. In particular, we demonstrate existence for which satisfied an equality pure states and a strict inequality mixed corresponding single well bipartite sytems qutrits. Examples such are found magnitude proportional linear...
Bell state measurement (BSM) plays crucial roles in photonic quantum information processing. The standard linear optical BSM is based on Hong-Ou-Mandel interference where two photons meet and interfere at a beamsplitter (BS). However, generalized two-photon not photon-photon interaction, but between probability amplitudes. Therefore, it might be possible to implement without interfering BS. Here, we investigate scheme which does require photon overlapping By unleashing the coexistence...
Quantum correlations between identical particles are at the heart of quantum technologies. Several studies with two have shown that spatial overlap and indistinguishability necessary for generating bipartite entanglement. On other hand, researches on extension to more than two-particle systems limited by practical difficulty control multiple in laboratories. In this work, we propose schemes generate fundamental classes genuine tripartite entanglement, i.e., GHZ W classes, which...
We derive a fine-grained uncertainty relation for the measurement of two incompatible observables on single quantum system continuous variables, and show that variable systems are more uncertain than discrete systems. Using derived relation, we formulate stronger steering criterion is able to reveal steerability N00N states has hitherto not been possible using other criteria. further obtain monogamy our inequality which leads an, in principle, improved lower bound secret key rate one-sided...
Different nonlocal quantum correlations of entanglement, steering and Bell nonlocality are defined with the help local hidden state (LHS) variable (LHV) models. Considering their unique roles in information processing, it is importance to understand individual correlation as well relationship. Here, we investigate effects amplitude damping decoherence on different correlations. In particular, have theoretically experimentally shown that entanglement sudden death phenomenon distinct from...
The fine-grained uncertainty relation can be used to discriminate among classical, quantum, and superquantum correlations based on their strength of nonlocality, as has been shown for bipartite tripartite systems with unbiased measurement settings. Here we consider the situations when two three parties choose settings bias playing certain nonlocal games. We show analytically that while principle is still able distinguish biased corresponding ranges biasing parameters, above-mentioned...
The upper bound of the fine-grained uncertainty relation is different for classical physics, quantum physics and no-signaling theories with maximal nonlocality (supper correlation), as was shown in case bipartite systems [J. Oppenheim S. Wehner, Science 330, 1072 (2010)]. Here, we extend to tripartite systems. We show that determines manifested by Svetlichny inequality, discriminating between super correlations.
Steering, a quantum property stronger than entanglement but weaker non-locality in the correlation hierarchy, is key resource for one-sided device-independent distribution applications, which only one of communicating parties trusted. A fine-grained steering inequality was introduced [PRA 90 050305(R) (2014)], enabling first time detection all steerable two-qubit Werner states using two measurement settings. Here we numerically and experimentally investigate this generalized successfully...