Article
Chemistry, Physical
Giovanni Bressan, Jasper J. van Thor
Summary: This study presents an analytical expression to describe the orientational part of molecular response, which is evaluated for different conditions. Results obtained in the strong-field conditions suggest that careful analysis of two-dimensional spectroscopic experimental data should include laser pulse intensity considerations.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Optics
Zhuang Wang, Zheng Yuan, Yuan Gao, Wenxiang Yan, Chunjuan Liang, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, Hui-Tian Wang
Summary: This study introduces a novel curvilinear optical vortex beam called twin curvilinear vortex beams (TCVBs), with specific intensity and phase distribution, and demonstrates its potential applications in optical tweezers through simulation and experiment.
Article
Physics, Multidisciplinary
Hai-Yun Wang, Zhao-Hui Yang, Kun Liu, Ya-Hong Chen, Lin Liu, Fei Wang, Yang-Jian Cai
Summary: In this paper, a new type of partially coherent beams called generalized high-order twister partially coherent beams (GHTPCBs) is introduced, which can carry high-order twist phase and orbital angular momentum (OAM). The propagation dynamics of GHTPCBs in free space, including spectral density and OAM flux density, are numerically investigated using mode superposition and fast Fourier transform (FFT) algorithm. The results show that GHTPCBs can self-focus and exhibit teardrop-like or diamond-like beam spot shapes during propagation under certain conditions. The effects of twist order and twist factor on OAM flux density during propagation are also illustrated in detail. Additionally, GHTPCBs with controllable twist phase are experimentally synthesized using pseudo-mode superposition, and their spectral density during propagation is measured. The experimental results are in good agreement with the theoretical predictions. The findings of this study may have applications in nonlinear optics and particle trapping.
FRONTIERS OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Ryo Nishiyama, Motohiro Sato
Summary: This study investigates the structural design of bamboo as a fishing rod material by solving nonlinear bending equations. The results are useful for bamboo-inspired bionic design and highlight our ancestors' deep knowledge and advanced technological capabilities in natural materials.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Shuhe Wu, Guzhi Bao, Jinxian Guo, Jun Chen, Wei Du, Minwei Shi, Peiyu Yang, Liqing Chen, Weiping Zhang
Summary: In the past few decades, optical magnetometry has made remarkable progress in sensitivity, but is limited by spin projection noise, photon shot noise, and magnetic noise. In this study, a quantum magnetic gradiometer with sub-shot-noise sensitivity is demonstrated using entangled twin beams, showing great potential for developing sensitive magnetometry in noisy environments.
Article
Chemistry, Physical
Alexandre R. Coates, Brendon W. Lovett, Erik M. Gauger
Summary: Understanding energy transport is important for light-harvesting and quantum technologies. Open quantum systems theory predicts environmental noise-assisted quantum transport (ENAQT) in biological and artificial systems. Previous studies focused on canonical structures like chains, rings, and light-harvesting complexes, leading to assumptions about ENAQT. This paper shows that physically modeled transport networks can have at least two ENAQT peaks in their steady state transport efficiency.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
F. Borselli, M. Maiwoeger, T. Zhang, P. Haslinger, V Mukherjee, A. Negretti, S. Montangero, T. Calarco, I Mazets, M. Bonneau, J. Schmiedmayer
Summary: The experiment demonstrates a source of correlated atom pairs with opposite momenta and spatial modes forming a Bell state, characterized by strong number squeezing and genuine two-particle interference in the emitted atom beams.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino
Summary: The ability to encode and transmit information using the temporal and spatial degrees of freedom of quantum states of light is crucial for an efficient quantum network. However, there is still a lack of control required to fully utilize the high dimensionality of the spatial degree of freedom. In this study, we encode information in the spatial correlations of entangled twin beams, taking advantage of their dependence on the angular spectrum of the pump for four-wave mixing. We demonstrate that the encoded information can only be extracted through joint spatial measurements of the twin beams, without modifying the temporal quantum correlations.
Article
Materials Science, Multidisciplinary
Xiaomei He, Suzhi Li, Xiangdong Ding, Jun Sun, Sergey Kustov, Ekhard K. H. Salje
Summary: This study presents the first attempt to investigate the internal friction of complex ferroelastic twin patterns using atomistic molecular dynamics simulations. Linear and non-linear internal friction regimes are observed at different stress amplitudes, separated by a pinning/depinning threshold. The motion of twin boundaries generates non-linear anelasticity, where the stress-dependent internal friction increases to a maximum and then decays. The internal friction is directly related to the motion of needle twins.
Article
Multidisciplinary Sciences
Alessandra Gatti, Ottavia Jedrkiewicz, Enrico Brambilla
Summary: In this study, a semi-analytic model is proposed to describe the entangled twin beams generated by parametric down-conversion. The model is used to investigate the quantum correlation and coherence of the emitted photons in the angle-frequency domain. The results show that the size of the photons grows with a g1/2 dependence as the gain increases, accompanied by a contraction of the space-time distribution. The predictions of the model are in excellent agreement with stochastic numerical simulations.
SCIENTIFIC REPORTS
(2023)
Article
Biochemical Research Methods
Xize Xu, Hermann Riecke
Summary: The study explores the impact of neuronal heterogeneity on the synchronization of gamma-rhythms in different brain areas, identifying a paradoxical phenomenon where synchronized rhythms may advance when subjected to external inhibition due to intrinsic neuronal heterogeneity. These findings help to explain the role of neuronal heterogeneity in the synchronization of coupled gamma-rhythms.
PLOS COMPUTATIONAL BIOLOGY
(2021)
Article
Physics, Multidisciplinary
Nicola Defenu
Summary: The study investigates adiabatic cycles across quantum critical points with Bose quasi-particles and shows that adiabaticity breakdown is a universal feature of these systems. It proves that the slow dynamics of Bose systems is always non-adiabatic and quantum corrections become rate independent in the slow drive limit. These findings challenge the common expectation for quasi-static processes and demonstrate the non-adiabatic nature of quantum harmonic oscillator systems.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Dorian A. Gangloff, Leon Zaporski, Jonathan H. Bodey, Clara Bachorz, Daniel M. Jackson, Gabriel Ethier-Majcher, Constantin Lang, Edmund Clarke, Maxime Hugues, Claire Le Gall, Mete Atature
Summary: The study proposes a method to reconstruct the nuclear spin ensemble by exploiting its response to collective spin excitations, demonstrating that the ensemble is in a non-thermal, correlated state with a significant deviation from the classical prediction. The reconstructed species-resolved polarizations suggest the presence of inter-particle coherences and serve as entanglement witnesses for the formation of a dark many-body state within the ensemble.
Article
Chemistry, Physical
Luca Bolzonello, Francisco Bernal-Texca, Luis G. Gerling, Jana Ockova, Elisabetta Collini, Jordi Martorell, Niek F. van Hulst
Summary: The performance of nonfullerene-acceptor-(NFA)-based organic solar cells is approaching inorganic cells, with low voltage losses and efficient exciton dissociation being important factors. Using spectroscopic methods, rapid electron/hole transfer dynamics were observed in PM6/Y6 solar cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Xinju Guo, Xiaomei Zhang, Dirui Xu, Weixin Chen, Yi Guo, Ke Lan, Baifei Shen
Summary: Coherent beam combining technology is a promising method for generating high-power vortex beams. Utilizing multiple Laguerre-Gaussian beams, we propose a practical system for generating a high-power beam with orbital angular momentum. The combined field exhibits similar orbital angular momentum distribution as a single Laguerre-Gaussian beam within the Rayleigh length, and shows stable spatial propagation with relativistic intensity local spots. This system may have applications in intense vortical fields and large-scale nuclear fusion devices, such as suppressing stimulated Raman scattering and filamentation in plasma.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
M. Drong, T. Fordos, H. Y. Jaffres, J. Perina, K. Postava, P. Ciompa, J. Pistora, H-J Drouhin
Summary: This study presents a semiclassical model for spin-injected vertical-cavity surface-emitting lasers with local optical anisotropies, focusing on highly anisotropic spin lasers. A generalized matrix formalism for extracting laser modes and a coupled-mode theory for studying time dependence of laser modes are introduced. The theory, based on circularly polarized optical modes, demonstrates advantages in designing and optimizing spin-VCSEL structures with high-contrast gratings for applications in terahertz range polarization modulation and compact terahertz sources.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrj Haderka
Summary: Selective post-selection of one beam out of a system of three correlated beams with bi-partite photon-number correlations leads to joint photon-number distributions with checkered patterns. The experimental and theoretical analysis shows nonclassical properties of these states as they vary with the ratio of correlated and anti-correlated contributions, confirmed by 2D histograms reconstructed by maximum-likelihood approach. The investigations suggest potential applications in two-photon excitations of atoms and molecules as well as two-photon spectroscopy.
Article
Physics, Applied
Jan Perina, Antonin Cernoch, Jan Soubusta
Summary: This study investigates a scheme for building stronger multimode twin beams from a large number of identical twin beams that are weak enough to be detected using single-photon-sensitive on-off detectors. The statistical properties of these compound twin beams, which exhibit nonclassical behavior, are analyzed for intensities up to hundreds of photon pairs and compared with genuine twin beams that require photon-number-resolving detectors. The use of compound twin beams for generating sub-Poissonian light and measuring absorption with sub-shot-noise precision is discussed, along with the development of a theoretical model to interpret experimental data.
PHYSICAL REVIEW APPLIED
(2021)
Article
Physics, Multidisciplinary
Joanna K. Kalaga, Wieslaw Leonski, Radoslaw Szczesniak, Jan Perina
Summary: We investigate the relationship between the states of three-qubit systems and linear entropy, as well as measures of coherence such as degree of coherence, first- and second-order correlation functions. We demonstrate that qubit-qubit states exhibit strong entanglement when the linear entropy falls within a certain range of values. Additionally, we derive the conditions for the boundary values of linear entropy, which are parameterized by measures of coherence.
Article
Engineering, Electrical & Electronic
Mariusz Drong, Maciej Dems, Jan Perina, Tibor Fordos, Henri-Yves Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: This study presents a theoretical framework that combines the laser rate equations and cavity perturbation theory for micro-cavity lasers with optical anisotropies. By deriving polarization-resolved coupled-mode equations, the method offers physical insights and accuracy comparable to finite-difference time-domain methods, saving time and suitable for semi-analytic studies.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Shilan Abo, Grzegorz Chimczak, Anna Kowalewska-Kudlaszyk, Jan Perina, Ravindra Chhajlany, Adam Miranowicz
Summary: We describe a novel type of blockade, called hybrid photon-phonon blockade, generated by linear coupling of photonic and phononic modes. By mixing the photonic and phononic modes, which do not exhibit blockade individually, we are able to generate the hybrid photon-phonon blockade.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Artur Barasinski, Jan Perina Jr, Antonin Cernoch
Summary: Identification and quantification of quantum correlations are crucial for understanding and manipulating quantum devices and processes. We have developed and implemented a general method to quantify different forms of quantum correlations using experimental intensity moments up to the fourth order. These moments allow for the precise determination of global and marginal impurities of two-beam Gaussian fields, enabling the assessment of steering, tight lower and upper bounds for negativity, and the use of Kullback-Leibler divergence as a quantifier for nonseparability. The method has been successfully demonstrated on experimental twin beams and squeezed super-Gaussian beams. It can be readily applied to characterize quantum correlations in multibeam Gaussian fields.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Jan Perina, Adam Miranowicz, Grzegorz Chimczak, Anna Kowalewska-Kudtaszyk
Summary: This paper discusses equivalent approaches to determine the eigenfrequencies of the Liouvillians of open quantum systems using the solution of the Heisenberg-Langevin equations and the corresponding equations for operator moments. The equivalence of both approaches is demonstrated by analyzing a simple damped two-level atom. The presented approach via the Heisenberg-Langevin equations reveals the structure and eigenfrequencies of quantum exceptional and diabolical points.
Article
Optics
Mariusz Drong, Jan Perina, Tibor Fordos, Henri Y. Jaffres, Kamil Postava, Henri-Jean Drouhin
Summary: It is found that spin-injected vertical-cavity surface-emitting lasers (spin-VCSELs) exhibit interesting functionalities when considering the linear gain anisotropy. Using the extended spin-flip model (SFM), exceptional points (EPs) are predicted in spin-VCSELs along with two interesting phenomena: polarization switching and frequency comb generation. These effects have great technological potential and are not limited to spin-VCSEL technology. The concept of anisotropy-engineered non-Hermitian microlasers and their polarization dynamics near EPs are discussed.
Proceedings Paper
Optics
Kishore Thapliyal, Jan Perina
Summary: This article systematically analyzes the generation of Stokes-anti-Stokes photon pairs in Raman scattering and provides suitable conditions for photon pair generation. In addition to the Raman active material properties and pump power, non-zero mean phonon number and losses in the phonon mode are also relevant parameters. Raman active materials with stronger anti-Stokes coupling are suitable for photon pair generation, even for non-zero thermal phonons as long as phonon losses are negligible.
22ND POLISH-SLOVAK-CZECH OPTICAL CONFERENCE ON WAVE AND QUANTUM ASPECTS OF CONTEMPORARY OPTICS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Mariusz Drong, Jan Perina, Maciej Dems, Tomasz G. Czyszanowski, Tibor Fordos, Henri Jaffres, Kamil Postava, Henri-Jean M. Drouhin
Summary: We present a nonlinear coupled-mode theory for anisotropic microcavity lasers, particularly for birefringent spin-lasers. The model can be used to investigate the effects of spin modulation and grating parameters on the performance of realistic grating-based spin-lasers.
QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVIII
(2022)
Article
Optics
Jan Perina, Pavel Pavlicek, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: This study derives nonclassicality criteria for general N-dimensional optical fields, which involve intensity moments, photon-number distribution probabilities, or combinations of both. The Hillery criteria for sums of even or odd photon numbers are generalized to N-dimensional fields. These criteria are then applied to an experimental three-mode optical field containing two types of photon-pair contributions, and the accompanying nonclassicality depths are used for performance comparison.
Article
Optics
Jan Perina, Vaclav Michalek, Radek Machulka, Ondrej Haderka
Summary: The research shows that the twin beams exhibit anticorrelations in photon-number fluctuations in the signal and idler beams under specific conditions, with sub-Poissonian photon-number statistics. The postselected fields are reconstructed from experimental data using the maximum likelihood method, and their nonclassical properties are analyzed and quantified using appropriate criteria. Comparisons are made between the postselected fields obtained with actual and ideal photon-number-resolved detectors.
Article
Optics
Kishore Thapliyal, Jan Perina
Summary: The quantum model of the Raman process examines nonclassical correlations between photons in the Stokes and anti-Stokes fields, analyzing the impact of various parameters on these correlations. The study also reveals conditions for the Stokes and anti-Stokes fields to be composed of only photon pairs, allowing for nonzero mean thermal phonon numbers.
