Article
Astronomy & Astrophysics
Gabriel Menezes
Summary: Multi-messenger astronomy provides us with the possibility of discovering phenomenological signatures of quantum-gravity effects. Feasible explorations within the effective field theory (EFT) treatment of general relativity have been discussed. Current techniques borrowed from modern amplitude methods were used to calculate leading quantum corrections to the classical radiated momentum and spectral waveforms. The results highlight the potential applications of the EFT approach in gravitational-wave physics. Furthermore, possible phenomenological surveys from the perspective of a UV completion for quantum gravity employing quadratic gravity were examined, revealing a deviation from the standard general-relativity prediction.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
N. Wanwieng, N. Chattrapiban, A. Watcharangkool
Summary: We investigate the influence of gravitational waves on a freely falling hydrogen atom by analyzing the dynamics of the bound electron described by the Dirac equation in the curved spacetime of a gravitational wave. We derive the corresponding Dirac Hamiltonian in the local inertial frame of the atom and employ the Foldy-Wouthuysen transformation to obtain a non-relativistic description. The analysis of interaction terms and comparison with flat spacetime counterparts provide valuable insights into the effects of gravitational waves on the hydrogen atom.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Sukanta Panda, Abbas Tinwala, Archit Vidyarthi
Summary: This study employs the local momentum space technique to derive the first-order expansion of Feynman propagators for scalar field and graviton in the presence of background curvature. The obtained propagators are validated by comparing them with previous literature and traced heat kernel coefficients. These propagators are then utilized to calculate the one-loop divergences in the Vilkovisky-Dewitt's effective action for a scalar field non-minimally coupled with gravity in an arbitrary spacetime metric. The comparison between the VD effective action and the standard effective action reveals an important result regarding the limit kappa = 0 and the presence of gravity.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Quantum Science & Technology
Seonghoon Choi, Ignacio Loaiza, Artur F. Izmaylov
Summary: Measuring the expectation value of the molecular electronic Hamiltonian can be challenging, but a new method has been introduced to lower the variances of the fragments, reducing the number of measurements required.
Letter
Physics, Multidisciplinary
Mingtian Xu
Summary: This study proposes a simple algorithm for solving the Guyer-Krumhansl equations and examines the relationship between thermal conductivity of suspended graphene and heat flux boundary conditions. The results show that heat vortices can occur in the heat flux field when the strength of the point sink exceeds a critical value. Additionally, it is observed that the formation of heat vortices is also influenced by the side length perpendicular to the dominant heat flow direction. Furthermore, the study finds that the no-slip boundary condition facilitates the generation of heat vortices, while specular phonon-boundary interactions disrupt their formation. Interestingly, it is discovered that hydrodynamic heat conduction allows heat to flow from cold regions to hot regions in suspended single-layer graphene.
Article
Physics, Multidisciplinary
Lijun Li, Mengge Xue, Tianzong Xu, Yinming Liu, Yibo Yuan, Zheng Lin
Summary: This paper introduces an all-fiber flexible soft sensor that combines machine learning methods to recognize its own twisted shape. With high accuracy, simple structure, and reliable performance, the sensor shows great potential in intelligent robots, medical rehabilitation, surgical endoscopes, and object recognition.
Article
Physics, Multidisciplinary
Jose Manuel Mendez Martinez
Summary: This research investigates the role of entanglement in the generation of EPR correlations and proposes a new experimental setup to describe this role. The findings suggest that such entanglement can be fully understood in terms of local resources and shared randomness.
Article
Physics, Multidisciplinary
Sanjana Bhatia, C. N. Kumar, Ajay Nath
Summary: The formation of quantum droplets in a symmetric Bose-Bose mixture confined in temporally mutable parabolic traps is investigated using analytical methods. The dynamics of the droplets heavily depend on the dynamic nature of the trap. A mechanism is demonstrated to obtain exact droplet solutions even with imperfections in the dynamic trap, by using the isospectral Hamiltonian technique of supersymmetric Quantum Mechanics. This method allows for controlling the dynamics of the quantum droplets through the Riccati parameter, providing a valuable tool for investigating and adapting to unforeseen variations and deviations encountered in experimental scenarios.
Article
Physics, Multidisciplinary
Giovanni Chesi
Summary: This paper addresses the quantum dynamics of second harmonic generation using a perturbative approach. By examining the Taylor expansion of the unitary evolution, the subsequent application of annihilation and creation operators is identified as elementary processes. The authors find out how the expansion of the second-harmonic photon-number probability distribution can be expressed in terms of the interplay of these processes. Overlaps between the output states of different elementary processes are shown to contribute to the expansion of the probability distribution, and a diagrammatic technique is provided to analytically retrieve terms of the distribution expansion at any order.
Article
Physics, Multidisciplinary
Alberto Barchielli
Summary: This article discusses the problem of constructing a consistent quantum-classical hybrid dynamics. By quantum-classical interaction, the classical component can be observed and information on the quantum component can be extracted. The study shows that suitable dissipation terms must be present in the generator to achieve a flow of information from the quantum component to the classical one.
Article
Physics, Multidisciplinary
Huan Pei, Changjian Yu, Jialu Qi, Jiaxin Zhao, Weifeng Peng, Jiale Zhang, Yong Wei
Summary: In this study, we investigated the influence of quantum tunneling on the plasmon-enhanced electric field and photoluminescence spectroscopy in the subnanometer nanogap between two adjacent Ag nanoparticles using the quantum-corrected method. Our results demonstrate the high sensitivity of the quantum-induced effect and nonlocal dielectric response to the separation distance. In cases of shorter separation distances, the localized fields start to decrease due to tunneling current short circuit, resulting in a substantial reduction in Raman enhancement and fluorescence intensity in narrowing gaps.
Letter
Physics, Multidisciplinary
Alessia Allevi, Maria Bondani
Summary: Quantum technologies offer new possibilities for improving communication in underwater environments. This study presents an innovative communication protocol based on the utilization of quantum states, which shows promising outcomes for practical implementation in real-world scenarios.
Article
Physics, Multidisciplinary
N. Candemir, A. N. Ozdemir
Summary: This paper theoretically studies the linear and nonlinear optical properties of a GaAs quantum dot confined by a parabolic plus inverse square potential with a disclination under the influence of a magnetic field and the Aharonov-Bohm flux field. The Schrodinger equation for this system is derived and its solutions for the wave function and energy levels are obtained using the confluent hypergeometric equation. The effect of the disclination defect on the optical absorption coefficients and refractive index changes of the quantum dot is examined in detail. The results show that changes in the magnitude of the disclination parameter significantly affect the peak positions and amplitudes of the optical absorption coefficients and refractive index changes. Additionally, the effect of the disclination on the peak positions can be eliminated by adjusting the magnetic field strength.
Article
Physics, Multidisciplinary
Tatjana Pyragiene, Kestutis Pyragas
Summary: This study investigates the suppression control of unstable equilibrium states and coherent oscillations in large-scale neural networks. A first-order dynamic controller is implemented to stabilize unknown equilibrium states and successfully suppress coherent oscillations.
Article
Physics, Multidisciplinary
C. M. Dai, X. X. Yi
Summary: This study investigates the localization properties of a spin chain coupled to a quantized field and identifies two types of eigenstates with different localization properties in the system. The localization of spin excitation can be controlled by exciting the field to appropriate quantum states.
Article
Physics, Multidisciplinary
Saptarshi Nayak, Himanshu S. Gouda, Sashi S. Behera, Rajiba L. Hota
Summary: The binary and ternary telluride systems containing europium as one of the magnetic components exhibit a higher effective g factor and much lower effective mass due to spin-orbit interaction and s/p-f hybridized interaction. In this study, we investigated the ternary mixed crystal Sn1-xSrxTe, with strontium as the non-magnetic counterpart of europium, and derived functional equations and expressions for the effective g factor and effective mass. The results show that Sn1-xSrxTe has extremely elevated effective g factors and low effective mass, suggesting strong spin-orbit interaction and band edge coupling induced by substitutional impurity.
Article
Physics, Multidisciplinary
Bowen Wang
Summary: This study analyzes the transformation properties of the states and interactions for several typical processes within the standard model of particle physics, and shows through explicit calculations how angular momentum transfers in these processes. The discussion also explores the phenomenological consequences of the theoretical results obtained in this study.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Quantum Science & Technology
Yuhong Song, Edwin Hsing-Mean Sha, Qingfeng Zhuge, Wenlong Xiao, Qijun Dai, Longshan Xu
Summary: This paper introduces a new quantum circuit simulation technique called QuanPath, which eliminates communication and synchronization in each step, resulting in significant reduction in communication cost and simulation acceleration. Experimental results show that QuanPath performs well and has good scalability when simulating quantum algorithms.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Chemistry, Physical
Hanlin Lv, Jin Li, Zhengsheng Hu, Yuhang Wang, Yanjun Chen, Yifeng Wang
Summary: A multi-stimuli responsive photonic hydrogel was prepared by incorporating gold nanorods into a polystyrene photonic crystal template, exhibiting responsiveness to near-infrared light, pH, and temperature.
Article
Chemistry, Physical
Lasse Bonn, Aleksandra Ardaseva, Amin Doostmohammadi
Summary: Mechanical stress is associated with biological functionalities, and topological defects are points of localized mechanical stress. Simulation results show that increasing material elasticity changes the stress pattern around topological defects. Elastic anisotropy alters the extent and intensity of stresses, leading to dominance of tension or compression around defects.
