Article
Materials Science, Multidisciplinary
M. E. Ateuafack, G. D. Kemlekeu, M. G. Akumbom, J. T. Diffo, V. B. Mborong, L. C. Fai
Summary: The negative impact of population imbalance on the superfluid density was observed in the weak coupling regime. Furthermore, it was found that the system robustly resisted population imbalance in the strong coupling regime.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yago del Valle-Inclan Redondo, Christian Schneider, Sebastian Klembt, Sven Hoefling, Seigo Tarucha, Michael D. Fraser
Summary: We have created a rotating polariton condensate at gigahertz frequencies by off-resonantly pumping with a rotating optical stirrer composed of structured laser modes. The results show that the rotating polariton condensate acquires angular momentum exceeding the critical 1n/particle and demonstrates deterministic nucleation and capture of quantized vortices with a handedness controlled by the pump rotation direction. This study enables new opportunities for exploring open dissipative superfluidity, ordering of non-Hermitian quantized vortex matter, and topological states in a highly nonlinear, photonic platform.
Article
Physics, Multidisciplinary
Qi-wen Wang, Jin-ling Wang, Wen Wen, Ji Lin, Hui-jun Li
Summary: In this study, supersonic shock waves are generated and controlled in one-dimensional incoherent pumped exciton-polariton condensates. The region of existence of various shock waves is obtained by selecting a suitable initial wave and considering different parameters. The effects of gain, loss, non-adiabatic approximation, and reservoir diffusion coefficient on the shock wave profiles are discussed. The results indicate that the diffusion effect of the reservoir can clear small oscillations and tilt the platform between two waves, potentially paving the way for controlling shock waves in an incoherent pumped exciton-polariton system.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
J. C. Obeso-Jureidini, G. A. Dominguez-Castro, E. Neri, R. Paredes, V Romero-Rochin
Summary: This study demonstrates the universality of long-distance behavior for two-body density correlation functions and Cooper-pair probability density in a balanced mixture of a two-component Fermi gas during the Bardeen-Cooper-Schrieffer (BCS)-Bose-Einstein condensate (BEC) smooth transition. Numerical results show that these two-body quantities exhibit exponential decay with respect to the chemical potential and the low-energy behavior of the gap. A general expression is derived for the two-body distributions, which holds for various features of finite-range potentials.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Anton D. Putintsev, Kirsty E. Mcghee, Denis Sannikov, Anton V. Zasedatelev, Julian D. Topfer, Till Jessewitsch, Ullrich Scherf, David G. Lidzey, Pavlos G. Lagoudakis
Summary: Researchers have developed a new method for actively controlling the spatial properties of polariton condensates, independent of the excitation profile. This method allows for control over the spatial profile, density, and energy of polariton condensates at room temperature.
PHYSICAL REVIEW LETTERS
(2023)
Review
Physics, Applied
Alexey Kavokin, Timothy C. H. Liew, Christian Schneider, Pavlos G. Lagoudakis, Sebastian Klembt, Sven Hoefling
Summary: Polariton lasers emit coherent monochromatic light through a spontaneous emission process and show properties of Bose-Einstein condensation and superfluidity at room temperature. Emerging material systems for polariton lasers include organic molecules, transition metal dichalcogenides, perovskites, and liquid-crystal microcavities, which have potential applications in topological lasing, classical neuromorphic computing, and quantum information processing. Polaritonics, the study of strongly coupled light-matter states, offers advantages in classical and quantum information processing with full optical control and read-out capabilities.
NATURE REVIEWS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jing Zhou, Tingting Shi, Xia-Ji Liu, Hui Hu, Wei Zhang
Summary: We investigate the crossover from the BCS regime to the BEC regime in an anisotropic trapped quantum gas of ultracold fermionic atoms. By using a two-dimensional Hamiltonian with renormalized interactions and extending the Gaussian pair fluctuation theory to quasi-two-dimensional systems, we explore the effects of reduced dimensionality and Gaussian fluctuations on Fermi superfluidity at zero temperature. Our results are in good agreement with recent experiments on Li-6 atomic gases.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Condensed Matter
Eloisa Cuestas, Ana P. Majtey
Summary: By incorporating the effect of a trap with characteristic energy given by the Fermi temperature TF into a two-channel model for Feshbach resonances, the study successfully reproduces the binding energy of ultracold molecules and closed-channel fraction Z in atomic Fermi gases. The results are consistent with the expected behavior of Z proportional to root TF at unitarity, as well as recent measurements of the Z dependency on TF, providing valuable insights for future experiments.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Zhen-Xia Niu, Wei Zhang
Summary: In this study, a numerical analysis was conducted on the dynamical steady states of polariton Bose-Einstein condensates in an incoherent exciton reservoir driven by a ring-shaped optical pump. The balance between loss and gain of the polariton BEC resulted in a variety of steady states with different configurations, including topological defects such as vortex-antivortex pairs, vortices with a winding number, and solitons. The system became unstable under fast decay rates and small pumping ring, causing the BECs to no longer exist in the long-time limit. Additionally, it was confirmed that solitons were dynamically stable in this system, with a steady polariton current induced by repulsive interactions.
FRONTIERS IN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Kun Zhang, Wen Wen, Ji Lin, Hui-jun Li
Summary: The proposal introduces a method to generate and stabilize various nonlinear modes, such as dark, bright, dark-like, bright-like solitons, and vortices with m = 1 and m = 2, in a nonresonantly pumped exciton-polariton condensate by introducing spatially modulating pumping. Numerical simulations demonstrate that the balance between gain and loss can support the existence and stability of various nonlinear modes beyond just stable dark solitons in this scheme. This proposal may offer a pathway to generate, stabilize, and control nonlinear modes in the nonresonantly pumped exciton-polariton system.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Edmond B. Madimabe, Conrad B. Tabi, Camus G. Latchio Tiofack, Timoleon C. Kofane
Summary: This paper demonstrates the existence of modulational instability in nonlinear exciton-polariton condensates. The growth rate expression is derived through linear stability analysis of continuous waves, and a parametric study of modulational instability is conducted. The results show that the photonic spin-orbit coupling and the pumping power have an impact on the growth rate spectrum.
Article
Optics
Krzysztof Tyszka, Magdalena Furman, Rafal Mirek, Mateusz Krol, Andrzej Opala, Bartlomiej Seredynski, Jan Suffczynski, Wojciech Pacuski, Michal Matuszewski, Jacek Szczytko, Barbara Pietka
Summary: This paper introduces a new approach to neuromorphic photonics using microcavities as building blocks of optical spiking neurons, and demonstrates its feasibility through experimental results. The research shows that exciton-polaritons exhibit characteristics similar to the Leaky Integrate-and-Fire (LIF) mechanism, enabling ultrafast processing on sub-ns timescales.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Xiang-Chuan Yan, Da-Li Sun, Lu Wang, Jing Min, Shi-Guo Peng, Kai-Jun Jiang
Summary: In this study, characteristic atomic behaviors in the BECBCS crossover were observed by tuning the magnetic field across the Feshbach resonance, revealing a non-monotonic anisotropic expansion and indication of bimodal distribution in a condensate of diatomic molecules. The measurement of three-body recombination atom loss also supported previous experiments and theoretical predictions, showing that the maximum atom loss occurs in the BEC limit and gets closer to the Feshbach resonance at lower atom temperatures. This work provides a controllable platform for studying strongly interacting Fermi gases.
Article
Physics, Condensed Matter
Ziyu Ye, Fei Chen, Hang Zhou, Song Luo, Fenghao Sun, Zheng Sun, Yuanlin Zheng, Xianfeng Chen, Huailiang Xu, Zhanghai Chen, Hui Li, Jian Wu
Summary: Based on ZnO microcavities with high quality factors, this study investigates the dynamics of polariton condensation under non-resonant excitation. The results reveal that the ultrafast dynamics of polariton condensation is sensitive to the polarization direction of the excitation pulses, which can be explained by the selective excitation of distinct exciton modes and the effective coupling strength of the excitation pulses in the ZnO microcavity.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Optics
Jinqi Wu, Rui Su, Antonio Fieramosca, Sanjib Ghosh, Jiaxin Zhao, Timothy C. H. Liew, Qihua Xiong
Summary: This study reports a low-threshold on-chip perovskite polariton parametric oscillator, which utilizes polariton-polariton interactions to achieve a signal close to the ground state at room temperature. This polaritonic system combines photons with excitons, exhibiting enhanced optical nonlinearity for highly nonlinear operations with low power consumption.
ADVANCED PHOTONICS
(2021)
Article
Physics, Multidisciplinary
Tomoyuki Horikiri, Kenichiro Kusudo, Michael D. Fraser, Yasuhiro Matsuo, Andreas Loeffler, Sven Hoefing, Alfred Forchel, Yoshihisa Yamamoto
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2018)
Article
Physics, Applied
Toru Aonishi, Kazushi Mimura, Masato Okada, Yoshihisa Yamamoto
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Multidisciplinary
Timothee Leleu, Yoshihisa Yamamoto, Peter L. McMahon, Kazuyuki Aihara
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Ryan Hamerly, Takahiro Inagaki, Peter L. McMahon, Davide Venturelli, Alireza Marandi, Tatsuhiro Onodera, Edwin Ng, Carsten Langrock, Kensuke Inaba, Toshimori Honjo, Koji Enbutsu, Takeshi Umeki, Ryoichi Kasahara, Shoko Utsunomiya, Satoshi Kako, Ken-ichi Kawarabayashi, Robert L. Byer, Martin M. Fejer, Hideo Mabuchi, Dirk Englund, Eleanor Rieffel, Hiroki Takesue, Yoshihisa Yamamoto
Article
Physics, Applied
Y. Yamamoto, T. Leleu, S. Ganguli, H. Mabuchi
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Multidisciplinary
Yoshitaka Inui, Yoshihisa Yamamoto
Summary: Our study demonstrates that the entanglement criterion by Hillery-Zubairy is satisfied both below and above the threshold of coupled non-degenerate optical parametric oscillators with strong nonlinear gain saturation and dissipative linear coupling. We found that below-threshold entanglement may depend on detuning in the parametric interaction, while entanglement is possible even without detuning in the interaction below the threshold.
Article
Quantum Science & Technology
Toru Aonishi, Kazushi Mimura, Masato Okada, Yoshihisa Yamamoto
Summary: A quantum-classical hybrid system is proposed for optimization in L0-regularization-based compressed sensing, potentially outperforming L1-regularization-based compressed sensing. The system utilizes a coherent Ising machine as the quantum machine and shows promising theoretical performance close to the limit of compressed sensing, surpassing L1-RBCS in estimation accuracy in practical applications such as magnetic resonance imaging data analysis.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Kensuke Inaba, Takahiro Inagaki, Koji Igarashi, Shoko Utsunomiya, Toshimori Honjo, Takuya Ikuta, Koji Enbutsu, Takeshi Umeki, Ryoichi Kasahara, Kyo Inoue, Yoshihisa Yamamoto, Hiroki Takesue
Summary: In this study, we demonstrate a solver for the Potts model using hybrid computation, which combines physical and digital architectures. By updating interaction matrices based on the Ising solutions, we are able to save resources and obtain approximate solutions to integer optimization problems efficiently.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Edwin Ng, Tatsuhiro Onodera, Satoshi Kako, Peter L. McMahon, Hideo Mabuchi, Yoshihisa Yamamoto
Summary: This study explores the nonlinear stochastic dynamics of a measurement-feedback-based coherent Ising machine in the presence of quantum noise, demonstrating its potential to sample degenerate ground and low-energy spin configurations of the Ising model. A discrete-time Gaussian-state model of the machine is formulated to accurately capture the nonlinear dynamics above system threshold. Numerical simulations show that operating the machine in a quantum-noise-dominated regime can efficiently produce samples of low-energy Ising spin configurations.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Quantum Science & Technology
Sam Reifenstein, Satoshi Kako, Farad Khoyratee, Timothee Leleu, Yoshihisa Yamamoto
Summary: The Coherent Ising Machine proposed in this study utilizes a network of quantum oscillators and optical error correction circuits to establish quantum correlations and decision-making processes. It features low power consumption and chaotic search capabilities, making it suitable for solving various types of problems.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Optics
Yoshitaka Inui, Yoshihisa Yamamoto
Article
Quantum Science & Technology
Yoshihisa Yamamoto, Masahide Sasaki, Hiroki Takesue
QUANTUM SCIENCE AND TECHNOLOGY
(2019)
Article
Physics, Multidisciplinary
Hriomasa Sakaguchi, Shuhei Tamate, Yoshihisa Yamamoto, Kazuyuki Aihara, Shoko Utsunomiya
JOURNAL OF PHYSICS COMMUNICATIONS
(2018)
Article
Quantum Science & Technology
Y. Takeda, S. Tamate, Y. Yamamoto, H. Takesue, T. Inagaki, S. Utsunomiya
QUANTUM SCIENCE AND TECHNOLOGY
(2018)
Article
Quantum Science & Technology
Satoshi Kako, Timothee Leleu, Yoshitaka Inui, Farad Khoyratee, Sam Reifenstein, Yoshihisa Yamamoto
ADVANCED QUANTUM TECHNOLOGIES
(2020)