Article
Physics, Applied
Ramachandrarao Yalla, K. Muhammed Shafi, Kali P. Nayak, Kohzo Hakuta
Summary: In this study, we demonstrate the creation of a one-sided cavity on an optical nanofiber using a composite method. The one-sided composite cavity is designed to enhance channeling efficiency and its coupling characteristics are validated through numerical simulations and experiments.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Beatriz Perez-Gonzalez, Alvaro Gomez-Leon, Gloria Platero
Summary: This study explores the physics of topological lattice models immersed in c-QED architectures with arbitrary coupling strength with the photon field. It proposes the use of cavity transmission as a topological marker and studies its behavior. The specific case of a fermionic Su-Schrieffer-Heeger (SSH) chain coupled to a single-mode cavity is used to illustrate the findings, which confirm that the cavity can act as a quantum sensor for topological phases. The persistence of topological features and the calculation of entanglement entropy are also discussed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Nicola Biagi, Saverio Francesconi, Alessandro Zavatta, Marco Bellini
Summary: The study on the conditional implementation of coherent superpositions of single-photon additions onto distinct field modes reveals interesting effects and useful applications, such as generating entanglement and peculiar correlations. Experimental investigation will have a significant impact on fundamental studies and quantum-enhanced technologies.
Article
Engineering, Electrical & Electronic
M. Hammani, A. Chouikh, T. Said, M. Bennai
Summary: We proposed a scheme to implement the CNOT gate using photonic qubits encoded on cavity modes and a four-level atom. The location of resonance was predicted using an effective three-level Hamiltonian. The interaction of multi-level atom with multi-mode fields in a cavity was theoretically studied and numerically calculated, along with analyzing the effects of decoherence using wave-function and density matrix approaches.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Physics, Multidisciplinary
Yanxin Liu, Zhihui Wang, Pengfei Yang, Qinxia Wang, Qing Fan, Shijun Guan, Gang Li, Pengfei Zhang, Tiancai Zhang
Summary: We demonstrate strong coupling between a one-dimensional single-atom array and a high-finesse miniature cavity experimentally. By loading single atoms into a one-dimensional optical tweezer array, a deterministic number of atoms is obtained and the atom number is determined through real-time imaging. By precisely controlling the position and spacing of the atom array, all atoms in the array are strongly coupled to the cavity simultaneously. The vacuum Rabi splitting spectra are observed for deterministic atom numbers from 1 to 8, validating the dependence of the collective ffiffiffiN enhancement of coupling strength on atom number N at the single-atom level.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Moteb M. Alqahtani, Mark S. Everitt, Barry M. Garraway
Summary: Based on a cavity QED framework, a universal set of logic gates is implemented using a multi-mode cavity and a multi-level atom. Effective Hamiltonians and gate parameters are determined to examine gate operations under decoherence. Conditional measurements of the ancilla atom are found to improve gate fidelities.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Nuclear Science & Technology
Guan-Hua Wang, Bo-Cheng Jiang, Jian-Hao Tan, Qing-Lei Zhang, Wen-Cheng Fang, Chang-Liang Li, Kun Wang, Xiao-Xia Huang, Sheng-Li Pu
Summary: A new longitudinal on-axis injection scheme based on a crab cavity is proposed to overcome the small dynamic aperture in a multi-bend achromat lattice of a diffraction-limited storage ring. Particle tracking simulations are used to study the disturbance of the stored beam and the motion of the injected beam during the injection process. The possibility of multi-bunch injections and the effect of the long-range wake field induced by the stored beam are also discussed. A C-band standing-wave crab cavity is designed and produced, with its field distribution measurements consistent with simulation results.
NUCLEAR SCIENCE AND TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
Kazuki Koshino, Tomohiro Shitara, Ziqiao Ao, Kouichi Semba
Summary: In this paper, the authors theoretically analyze the optical response of an ultrastrong cavity-QED system and report the possibility of deterministic three-photon down-conversion in the cavity. This rare event involving fourth-order transitions can be achieved even with a weak field due to the unprecedented strong-coupling region of the atom-cavity system.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Masaaki Mitsui, Daichi Arima, Yuki Kobayashi, Eunji Lee, Yoshiki Niihori
Summary: Metal nanoclusters (NCs) with alloyed metal cores have been shown to enhance the photoluminescence (PL) properties, and AgxAu25-x biicosahedral NCs have attracted significant attention due to their improved PL quantum yield. Spectroscopic investigations reveal that the PL of AgxAu25-x is phosphorescent and both Ag13Au12 and Ag12Au13 NCs contribute to the emission. The blue shift of the triplet states caused by replacing the central vertex atom with an Ag atom suppresses T-1-S-0 intersystem crossing and enhances phosphorescence emission. Additionally, the phosphorescence transition dipole moment of Ag13Au12 exists in the long axis direction of the biicosahedron. Furthermore, AgxAu25-x NCs can sensitize molecular triplets and efficiently induce red-to-blue photon upconversion via triplet-triplet annihilation.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Alberto Mercurio, Vincenzo Macri, Chris Gustin, Stephen Hughes, Salvatore Savasta, Franco Nori
Summary: This paper studies the photon flux emission rate of the quantum Rabi model under incoherent excitation of the two-level atom, considering different light-matter interaction strengths and effective temperatures. The emission spectra depend on the interplay between energy levels, matrix elements of observables, and the density of states of the reservoirs.
PHYSICAL REVIEW RESEARCH
(2022)
Proceedings Paper
Optics
S. Q. Tang, S. Luo, J. L. Xu
Summary: A two-qubit quantum swap gate scheme based on coherent state qubit is proposed in cavity quantum electrodynamics system. The scheme reduces quantum resource consumption and increases the operational speed of quantum logic gates. By utilizing the atomic ensemble scheme under large detuning limit conditions, decoherence is effectively suppressed, and experimental operability is improved. The fidelity of the quantum logic gate remains high even when considering photon loss.
QUANTUM AND NONLINEAR OPTICS VIII
(2021)
Article
Chemistry, Physical
Athulya Kadeprath Satheesan, Lakshmi V. Nair, Jishnu Sai Gopinath, Pattiyil Parameswaran, Chandrasekharan Keloth
Summary: We report the nonlinear absorptive and refractive properties of platinum-17 (Pt17) metal nanoclusters stabilized by carbon monoxide and triphenyl phosphine ligands. The studies reveal molecule-like behavior and discrete energy levels at the focus. The clusters also exhibit lower optical limiting threshold value and self-defocusing behavior against intense optical radiation. Additionally, we demonstrate the enhancement in the absorptive nonlinearity of the synthesized clusters through photonic crystal cavity-assisted intense field localization in the defect layer.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Taichi Sotani, Toshiko Mizokuro, Tatsuo Yajima, Hiromitsu Sogawa, Fumio Sanda
Summary: Ring-opening metathesis polymerization (ROMP) of norbornene derivatives is a useful method for preparing thermally stable and transparent polymeric materials with good moldability. The polymers obtained from ROMP exhibit bright photoluminescence under N2, and show potential for sensing oxygen in their phosphorescence properties.
Article
Infectious Diseases
Houqin Yi, Ganjun Yuan, Shimin Li, Xuejie Xu, Yingying Guan, Li Zhang, Yu Yan
Summary: The research discovered correlations between the mutant selection index and drug ratio in combination therapy, as well as a positive correlation between the mutation-preventing selection index and the minimal inhibitory concentration or mutant prevention concentration. The minimal inhibitory concentration is an important index for predicting mutation-preventing effects and collateral sensitivity trajectories. Based on these findings, principles and schemes were proposed to guide the prevention of antimicrobial resistance.
Article
Instruments & Instrumentation
A. Fassina, M. Alonzo, F. Filippi, D. Fiorucci
Summary: Measurements of internal magnetic fields are crucial in laboratory plasma physics, and the most common method used is Faraday rotation measurement through polarimetry. However, measuring small magnetic fields in small, low density plasmas can be challenging. To improve diagnostic sensitivity, a multipass scheme is necessary due to the diffraction phenomena limiting the probing wavelength to the THz region. This study investigates the application of a multipass cavity to the PROTO-SPHERA experiment and provides insights applicable to experiments with similar characteristics.
JOURNAL OF INSTRUMENTATION
(2023)
Article
Quantum Science & Technology
Jaehak Lee, Jiyong Park, Hyunchul Nha
NPJ QUANTUM INFORMATION
(2019)
Article
Multidisciplinary Sciences
Jiyong Park, Jaehak Lee, Hyunchul Nha
SCIENTIFIC REPORTS
(2019)
Article
Computer Science, Information Systems
Ho-Joon Kim, Soojoon Lee, Ludovico Lami, Martin B. Plenio
Summary: In this study, the dynamic resource theory of quantum entanglement was formulated using the superchannel theory, with separable channels and free superchannels identified as free resources, and swap channels chosen as dynamic entanglement golden units. The main results showed that the one-shot dynamic entanglement cost and distillable dynamic entanglement of a bipartite quantum channel under free superchannels are bounded by specific criteria involving channel robustness and resource monotones. Furthermore, the one-shot catalytic dynamic entanglement cost under a larger class of free superchannels was found to be limited by the generalized log-robustness of channels.
IEEE TRANSACTIONS ON INFORMATION THEORY
(2021)
Article
Physics, Multidisciplinary
Jiyong Park
Summary: The study introduces a method for deriving a lower bound for a non-Gaussianity measure based on quantum relative entropy and demonstrates its effectiveness compared to previous methods. Additionally, the method is extended to measurements of multi-mode quantum states and finds application in non-Gaussian entanglement detection.
Article
Physics, Multidisciplinary
Jiyong Park
Summary: In this study, we derive accessible upper and lower bounds for quantum mutual information in continuous-variable quantum states. By observing certain functions of purities, we can bound the difference between quantum mutual information and its Gaussian reference. These bounds can be efficiently obtained by measuring purities and the covariance matrix without reconstructing the multimode quantum state. We also extend our approach to derive upper and lower bounds for the quantum total correlation of multimode quantum states and investigate the relations between the bounds for quantum mutual information and quantum conditional entropy.
Article
Optics
Woochang Shin, Changsuk Noh, Jiyong Park
Summary: We derive quantum Renyi-2 entropy power inequalities for Gaussian operations and show that they generalize known quantum von Neumann entropy power inequalities for Gaussian states. However, they do not hold for non-Gaussian states. We also derive quantum Renyi-2 entropy power inequalities that provide lower bounds for Gaussian operations for any state. The inequality for the squeezing operation has applications in the generation and detection of quantum entanglement.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Jaehak Lee, Jiyong Park, Jaewan Kim, M. S. Kim, Hyunchul Nha
Summary: Homodyne measurement is a crucial tool for addressing continuous variables in bosonic quantum systems. However, the use of a strong coherent local oscillator is not readily available for massive quantum systems like a Bose-Einstein condensate, making it necessary to establish a practical framework that includes the effects of nonideal local oscillators. We develop entanglement criteria beyond a Gaussian regime for realistic homodyne measurement, which do not require assumptions on the state of local oscillators.
Article
Physics, Multidisciplinary
Jaehak Lee, Kyunghyun Baek, Jiyong Park, Jaewan Kim, Hyunchul Nha
Summary: This paper investigates how to protect quantum resources from noise and identifies the fundamental limitations on concentrating and preserving these resources. By studying the properties of resource measures and the application of correlated input states, it reveals how to manipulate quantum resources more effectively.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Ho-Joon Kim, Soojoon Lee
Summary: This study establishes a resource theory for quantum measurements, revealing the importance of quantum coherence and quantum entanglement in such measurements.
Article
Physics, Multidisciplinary
Jiyong Park, Jaehak Lee, Hyunchul Nha
Summary: By establishing a framework of nonclassicality in phase space, we comprehensively address the characterization of nonclassical states and effectively detect all nonclassical Gaussian and non-Gaussian states. Importantly, our method provides an experimentally accessible lower bound for a nonclassicality measure and can be adapted for practical tests looking into the particle and wave nature of bosonic systems.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Jiyong Park, Jaehak Lee, Kyunghyun Baek, Hyunchul Nha
Summary: The study proposes a non-Gaussianity measure for a multimode quantum state based on the negentropy of quadrature distributions, which satisfies ideal properties such as faithfulness, invariance under Gaussian unitary operations, and monotonicity under Gaussian channels. A quantitative relation is found between this measure and previously proposed non-Gaussianity measures, allowing for estimation through homodyne detection without the need for full quantum-state tomography.
Article
Optics
Ho-Joon Kim, Soojoon Lee
Summary: The one-shot static entanglement cost to simulate a bipartite quantum channel is investigated under a set of nonentangling channels. The lower bound on this cost is determined by the generalized robustness of the target channel and the robust-generating power of the channel. It is found that the one-shot static entanglement cost under the extended set of channels is given by the channel's standard log-robustness.
Article
Optics
Minsu Kim, Jinhyoung Lee, Ho-Joon Kim, Sang Wook Kim
Article
Optics
Jiyong Park, Jaehak Lee, Kyunghyun Baek, Se-Wan Ji, Hyunchul Nha
Proceedings Paper
Engineering, Electrical & Electronic
Hyunchul Nha, Jaehak Lee, Jiyong Park
QUANTUM AND NONLINEAR OPTICS V
(2018)
