Article
Multidisciplinary Sciences
Xiyuan Lu, Mingkang Wang, Feng Zhou, Mikkel Heuck, Wenqi Zhu, Vladimir A. Aksyuk, Dirk R. Englund, Kartik Srinivasan
Summary: The authors demonstrate a method for generating orbital angular momentum (OAM) using photonic crystal ring resonators, while maintaining high cavity quality factors (up to 10^6). By ejecting high angular momentum states of a whispering gallery mode (WGM) microresonator through a grating-assisted mechanism, a scalable and chip-integrated solution for OAM generation is achieved.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Tianfeng Feng, Changliang Ren, Qin Feng, Maolin Luo, Xiaogang Qiang, Jing-Ling Chen, Xiaoqi Zhou
Summary: The study formulates the original EPR steering paradox into a contradictory equality, conducts experimental tests in a two-qubit scenario, and confirms that the experimental results coincide with theoretical predictions.
PHOTONICS RESEARCH
(2021)
Article
Physics, Multidisciplinary
Xiao-Qiang Su, Zong-Ju Xu, You-Quan Zhao
Summary: Exploring the role of entanglement in quantum nonequilibrium dynamics is important to understand the mechanism of thermalization in an isolated system. We study the relaxation dynamics in a one-dimensional extended Bose-Hubbard model after a global interaction quench by considering several observables: the local Boson numbers, the nonlocal entanglement entropy, and the momentum distribution functions. The results show that the degree of thermalization is affected by the distance from the integrable point and the size of the subsystem. The Pearson coefficient is employed to measure the correlation between the entanglement entropy and thermalization fidelity, and a strong correlation is demonstrated for the quenched system.
Article
Physics, Multidisciplinary
O. Alberton, M. Buchhold, S. Diehl
Summary: This study analyzes the quantum trajectory dynamics of free fermions subject to continuous monitoring, revealing two distinct dynamical regimes for weak and strong monitoring, with the emergence of a quantum Zeno-like area-law regime under strong monitoring. The presence of logarithmic finite size corrections near the critical point suggests a Berezinskii-Kosterlitz-Thouless mechanism underlying the transition, highlighting the unconventional entanglement transition in a physically realistic model for weak continuous measurements. The crucial role of the measurement aspect in determining whether a phase transition occurs is also demonstrated.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Nilanjan Roy, Jagannath Sutradhar, Sumilan Banerjee
Summary: We provide real-space and Fock-space characterizations of ergodic, nonergodic extended (NEE) and many-body localized (MBL) phases in an interacting quasiperiodic system. We show that a mobility edge in the single-particle excitations survives even in the presence of interaction in the NEE phase, while all single-particle excitations get localized in the MBL phase. We give complementary insights into the distinction of the NEE states from the ergodic and MBL states by computing local FS self-energies and decay length associated.
Article
Optics
Zhi-Xiang LI, Dong Zhu, Pei-Cheng Lin, Peng-Cheng Huo, Hong-Kuan Xia, Ming-Ze Liu, Ya-Ping Ruan, Jiang-Shan Tang, Miao Cai, Hao-Dong Wu, Chao-Ying Meng, Han Zhang, Peng Chen, Ting Xu, Ke-Yu Xia, Li-Jian Zhang, Yan-Qing Lu
Summary: In this work, we demonstrate the generation of high-dimensional entanglement using a single dielectric metasurface. By modulating the multiple degrees of freedom of photons, we encode path, spin angular momentum, and orbital angular momentum information. Experimental results confirm the nonlocal correlations between the photons and quantum state tomography is performed. This scheme offers potential for on-chip quantum state manipulation in integrated quantum communication.
PHOTONICS RESEARCH
(2022)
Article
Physics, Multidisciplinary
Fan Dai, Shuang-Yin Huang, Min Wang, Chenghou Tu, Yongnan Li, Hui-Tian Wang
Summary: The article investigates the use of spontaneous parametric down conversion (SPDC) technology based on an ultrathin nonlinear lithium niobite crystal to demonstrate relatively flat high-dimensional OAM entanglement. The differences in coincidences between different-order OAM modes significantly decrease, providing a microscale SPDC source for further enhancing the nonlinear process and generating optimal high-dimensional OAM entanglement.
FRONTIERS IN PHYSICS
(2022)
Article
Multidisciplinary Sciences
Tiancheng Zhang, Kaichen Dong, Jiachen Li, Fanhao Meng, Jingang Li, Sai Munagavalasa, Costas P. Grigoropoulos, Junqiao Wu, Jie Yao
Summary: In this work, a non-trivial twist-enabled coupling mechanism was identified and formulated in twisted bilayer photonic crystals, resulting in the generation of optical vortices. This study expands the field of moire photonics and opens up new possibilities for its applications.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Markus Hiekkamaki, Robert Fickler
Summary: Two-photon interference in multiple transverse-spatial modes along a single beam-path was studied, with observations of coalescence and anticoalescence in different spatial-mode multiports. This operation within spatial modes along a single beam path eliminates the need for interferometric stability and presents new pathways for implementing complex quantum information tasks using linear optical networks.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Hang Liu, Kun Wang, Huifang Ma, Jingxiang Gao, Meng Liu, Huiyun Zhang, Yuping Zhang
Summary: This paper presents a cross-cross-shaped resonator based on a THz metasurface to generate an optical vortex (OV) beam in real space. By exploiting the polarization topology around the bound states in continuum (BIC), the merging of BIC at the point & UGamma; is achieved by tuning the width of the cross resonator, which improves the Q factor and enhances field localization. Moreover, the switching between high-order and low-order OV beam generator controlled by the merged BIC is realized, extending the application of BIC in modulating orbital angular momentum.
Article
Physics, Multidisciplinary
Onur Pusuluk, Mahir H. Yesiller, Gokhan Torun, Ozgur E. Mustecaplioglu, Ersin Yurtsever, Vlatko Vedral
Summary: The quantum superposition principle is widely used in describing the bonding phenomenon in quantum mechanics. It explains the emergence of delocalized molecular orbitals and provides a method for constructing accurate electronic wavefunctions. In composite systems, the existence of quantum superposition can result in nonclassical correlations, which are considered as a resource in quantum technologies. In this study, we analyze the electronic ground states of three prototypical molecules using the framework of fermionic information theory. By introducing the concept of orbital discord, we decompose the pairwise orbital correlations into their classical and quantum parts in the presence of superselection rules. We find that quantum orbital correlations can be stronger than classical orbital correlations, although this is not often the case. Moreover, quantum orbital correlations can still exist in the absence of orbital entanglement, depending on the symmetries of the constituent orbitals. Finally, we demonstrate that orbital entanglement would be underestimated if the orbital density matrices were treated as qubit states.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Federico Roccati, Benedetto Militello, Emilio Fiordilino, Rosario Iaria, Luciano Burderi, Tiziana Di Salvo, Francesco Ciccarello
Summary: This study demonstrates the possibility of classical-channel models of gravity to establish quantum discord, despite the absence of entanglement. Significant amounts of discord are generated in the KTM model and its dissipative extension, starting from an uncorrelated state.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Alessia Suprano, Danilo Zia, Mathias Pont, Taira Giordani, Giovanni Rodari, Mauro Valeri, Bruno Piccirillo, Gonzalo Carvacho, Nicolo Spagnolo, Pascale Senellart, Lorenzo Marrucci, Fabio Sciarrino
Summary: This study uses a QD single-photon source to generate a complete set of quantum states with OAM for photon information processing. The performance of the method is evaluated through studying intraparticle entanglement and interparticle entanglement based on OAM, and the results pave the way for on-demand generation of high-dimensional quantum states.
ADVANCED PHOTONICS
(2023)
Article
Quantum Science & Technology
Wei Li, Le Wang, Shengmei Zhao
Summary: In this paper, we propose an extended SEPM-QKD protocol with the help of delocalized state measurement. The proposed scheme improves the key rate and extends the communication distance.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaofan Zhou, Jian-Song Pan, Suotang Jia
Summary: We investigated the many-body topological physics of interacting fermions in an extended Su-Schrieffer-Heeger (SSH) model using the density-matrix renormalization-group numerical method. The interaction-driven phase transition from the topological insulator phase to the charge density wave (CDW) phase was identified by analyzing various properties. The global phase diagram was mapped, showing nontrivial topological insulator, trivial insulator, and CDW phases. The phase transitions between the CDW phase and topologically trivial or nontrivial phases were found to be continuous, contrary to the first-order phase transitions in the interacting SSH model. The phase diagram of the interacting spinful SSH4 model with attractive or repulsive on-site spin interaction was also presented.
Article
Physics, Condensed Matter
Luis Craco
SOLID STATE COMMUNICATIONS
(2017)
Article
Materials Science, Multidisciplinary
L. Craco, J. L. B. Faria, S. Leoni
MATERIALS RESEARCH EXPRESS
(2017)
Article
Multidisciplinary Sciences
Luis Craco, Stefano Leoni
SCIENTIFIC REPORTS
(2017)
Article
Materials Science, Multidisciplinary
L. Craco, S. Leoni
Article
Materials Science, Multidisciplinary
L. Craco, S. Leoni
Article
Materials Science, Multidisciplinary
J. Fink, J. Nayak, E. D. L. Rienks, J. Bannies, S. Wurmehl, S. Aswartham, I Morozov, R. Kappenberger, M. A. ElGhazali, L. Craco, H. Rosner, C. Felser, B. Buechner
Article
Materials Science, Multidisciplinary
B. Freelon, Z. Yamani, Ian Swainson, R. Flacau, B. Karki, Yu Hao Liu, L. Craco, M. S. Laad, Meng Wang, Jiaqi Chen, R. J. Birgeneau, Minghu Fang
Article
Materials Science, Multidisciplinary
L. Craco, S. S. Carara, S. Leoni
Article
Materials Science, Multidisciplinary
L. Craco, S. Leoni
Article
Materials Science, Multidisciplinary
L. Craco, B. Freelon, A. M. Alafailakawi, B. Karki, S. Leoni
Article
Materials Science, Multidisciplinary
L. Craco, T. A. da Silva Pereira, S. R. Ferreira, S. S. Carara, S. Leoni
Article
Materials Science, Multidisciplinary
L. Craco, S. S. Carara
Article
Materials Science, Multidisciplinary
J. Faundez, T. N. Jorge, L. Craco
Article
Materials Science, Multidisciplinary
L. Craco
Article
Materials Science, Multidisciplinary
L. Craco, T. A. da Silva Pereira, S. Leoni