发布求助
文献互助 智能选刊 最新文献

SciPost Physics最新文献

筛选
英文 中文
Higher-form symmetry and chiral transport in real-time Abelian lattice gauge theory 实时阿贝尔晶格规理论中的高形式对称性和手性输运
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-19 DOI: 10.21468/scipostphys.17.3.085
Arpit Das, Adrien Florio, Nabil Iqbal, Napat Poovuttikul
{"title":"Higher-form symmetry and chiral transport in real-time Abelian lattice gauge theory","authors":"Arpit Das, Adrien Florio, Nabil Iqbal, Napat Poovuttikul","doi":"10.21468/scipostphys.17.3.085","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.085","url":null,"abstract":"We study classical lattice simulations of theories of electrodynamics coupled to charged matter at finite temperature, interpreting them using the higher-form symmetry formulation of magnetohydrodynamics (MHD). We compute transport coefficients using classical Kubo formulas on the lattice and show that the properties of the simulated plasma are in complete agreement with the predictions from effective field theories. In particular, the higher-form formulation allows us to understand from hydrodynamic considerations the relaxation rate of axial charge in the chiral plasma observed in previous simulations. A key point is that the resistivity of the plasma – defined in terms of Kubo formulas for the electric field in the 1-form formulation of MHD – remains a well-defined and predictive quantity at strong electromagnetic coupling. However, the Kubo formulas used to define the conventional conductivity vanish at low frequencies due to electrodynamic fluctuations, and thus the concept of the conductivity of a gauged electric current must be interpreted with care.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"14 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two infinite families of facets of the holographic entropy cone 全息熵锥的两个无限面族
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-19 DOI: 10.21468/scipostphys.17.3.084
Bartlomiej Czech, Yu Liu, Bo Yu
{"title":"Two infinite families of facets of the holographic entropy cone","authors":"Bartlomiej Czech, Yu Liu, Bo Yu","doi":"10.21468/scipostphys.17.3.084","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.084","url":null,"abstract":"We verify that the recently proven infinite families of holographic entropy inequalities are maximally tight, i.e. they are facets of the holographic entropy cone. The proof is technical but it offers some heuristic insight. On star graphs, both families of inequalities quantify how concentrated/spread information is with respect to a dihedral symmetry acting on subsystems. In addition, toric inequalities viewed in the K-basis show an interesting interplay between four-party and six-party perfect tensors.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"7 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
General quantum-classical dynamics as measurement based feedback 基于测量反馈的一般量子经典动力学
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-18 DOI: 10.21468/scipostphys.17.3.083
Antoine Tilloy
{"title":"General quantum-classical dynamics as measurement based feedback","authors":"Antoine Tilloy","doi":"10.21468/scipostphys.17.3.083","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.083","url":null,"abstract":"This note derives the stochastic differential equations and partial differential equation of general hybrid quantum--classical dynamics from the theory of continuous measurement and general (non-Markovian) feedback. The advantage of this approach is an explicit parameterization, without additional positivity constraints. The construction also neatly separates the different effects: how the quantum influences the classical and how the classical influences the quantum. This modular presentation gives a better intuition of what to expect from hybrid dynamics, especially when used to construct possibly fundamental theories.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"11 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Riemannian optimization of photonic quantum circuits in phase and Fock space 相空间和 Fock 空间中光子量子电路的黎曼优化
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-18 DOI: 10.21468/scipostphys.17.3.082
Yuan Yao, Filippo Miatto, Nicolás Quesada
{"title":"Riemannian optimization of photonic quantum circuits in phase and Fock space","authors":"Yuan Yao, Filippo Miatto, Nicolás Quesada","doi":"10.21468/scipostphys.17.3.082","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.082","url":null,"abstract":"We propose a framework to design and optimize generic photonic quantum circuits composed of Gaussian objects (pure and mixed Gaussian states, Gaussian unitaries, Gaussian channels, Gaussian measurements) as well as non-Gaussian effects such as photon-number-resolving measurements. In this framework, we parametrize a phase space representation of Gaussian objects using elements of the symplectic group (or the unitary or orthogonal group in special cases), and then we transform it into the Fock representation using a single linear recurrence relation that computes the Fock amplitudes of any Gaussian object recursively. We also compute the gradient of the Fock amplitudes with respect to phase space parameters by differentiating through the recurrence relation. We can then use Riemannian optimization on the symplectic group to optimize $M$-mode Gaussian objects, avoiding the need to commit to particular realizations in terms of fundamental gates. This allows us to \"mod out\" all the different gate-level implementations of the same circuit, which now can be chosen after the optimization has completed. This can be especially useful when looking to answer general questions, such as bounding the value of a property over a class of states or transformations, or when one would like to worry about hardware constraints separately from the circuit optimization step. Finally, we make our framework extendable to non-Gaussian objects that can be written as linear combinations of Gaussian ones, by explicitly computing the change in global phase when states undergo Gaussian transformations. We implemented all of these methods in the freely available open-source library MrMustard, which we use in three examples to optimize the 216-mode interferometer in Borealis, and 2- and 3-modes circuits (with Fock measurements) to produce cat states and cubic phase states.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"116 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flux-tunable Kitaev chain in a quantum dot array 量子点阵列中的通量可调基塔耶夫链
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-18 DOI: 10.21468/scipostphyscore.7.3.065
Juan Daniel Torres Luna, A. Mert Bozkurt, Michael Wimmer, Chun-Xiao Liu
{"title":"Flux-tunable Kitaev chain in a quantum dot array","authors":"Juan Daniel Torres Luna, A. Mert Bozkurt, Michael Wimmer, Chun-Xiao Liu","doi":"10.21468/scipostphyscore.7.3.065","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.065","url":null,"abstract":"Connecting quantum dots through Andreev bound states in a semiconductor-superconductor hybrid provides a platform to create a Kitaev chain. Interestingly, in a double quantum dot, a pair of poor man's Majorana zero modes can emerge when the system is fine-tuned to a sweet spot, where superconducting and normal couplings are equal in magnitude. Control of the Andreev bound states is crucial for achieving this, usually implemented by varying its chemical potential. In this work, we propose using Andreev bound states in a short Josephson junction to mediate both types of couplings, with the ratio tunable by the phase difference across the junction. Now a minimal Kitaev chain can be easily tuned into the strong coupling regime by varying the phase and junction asymmetry, even without changing the dot-hybrid coupling strength. Furthermore, we identify an optimal sweet spot at $pi$ phase, enhancing the excitation gap and robustness against phase fluctuations. Our proposal introduces a new device platform and a new tuning method for realizing quantum-dot-based Kitaev chains.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"3 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kicking it off(-shell) with direct diffusion 用直接扩散启动（-外壳
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-16 DOI: 10.21468/scipostphyscore.7.3.064
Anja Butter, Tomas Jezo, Michael Klasen, Mathias Kuschick, Sofia Palacios Schweitzer, Tilman Plehn
{"title":"Kicking it off(-shell) with direct diffusion","authors":"Anja Butter, Tomas Jezo, Michael Klasen, Mathias Kuschick, Sofia Palacios Schweitzer, Tilman Plehn","doi":"10.21468/scipostphyscore.7.3.064","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.064","url":null,"abstract":"Off-shell effects in large LHC backgrounds are crucial for precision predictions and, at the same time, challenging to simulate. We present a novel method to transform high-dimensional distributions based on a diffusion neural network and use it to generate a process with off-shell kinematics from the much simpler on-shell one. Applied to a toy example of top pair production at LO we show how our method generates off-shell configurations fast and precisely, while reproducing even challenging on-shell features.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"53 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A portable parton-level event generator for the high-luminosity LHC 用于高亮度大型强子对撞机的便携式偏子级事件发生器
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-16 DOI: 10.21468/scipostphys.17.3.081
Enrico Bothmann, Taylor Childers, Walter Giele, Stefan Höche, Joshua Isaacson, Max Knobbe
{"title":"A portable parton-level event generator for the high-luminosity LHC","authors":"Enrico Bothmann, Taylor Childers, Walter Giele, Stefan Höche, Joshua Isaacson, Max Knobbe","doi":"10.21468/scipostphys.17.3.081","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.081","url":null,"abstract":"The rapid deployment of computing hardware different from the traditional CPU+RAM model in data centers around the world mandates a change in the design of event generators for the Large Hadron Collider, in order to provide economically and ecologically sustainable simulations for the high-luminosity era of the LHC. Parton-level event generation is one of the most computationally demanding parts of the simulation and is therefore a prime target for improvements. We present a production-ready leading-order parton-level event generation framework capable of utilizing most modern hardware and discuss its performance in the standard candle processes of vector boson and top-quark pair production with up to five additional jets.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"34 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142249700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Emergent generalized symmetries in ordered phases and applications to quantum disordering 有序相中的新兴广义对称性及其在量子无序化中的应用
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-13 DOI: 10.21468/scipostphys.17.3.080
Salvatore D. Pace
{"title":"Emergent generalized symmetries in ordered phases and applications to quantum disordering","authors":"Salvatore D. Pace","doi":"10.21468/scipostphys.17.3.080","DOIUrl":"https://doi.org/10.21468/scipostphys.17.3.080","url":null,"abstract":"We explore the rich landscape of higher-form and non-invertible symmetries that emerge at low energies in generic ordered phases. Using that their charge is carried by homotopy defects (i.e., domain walls, vortices, hedgehogs, etc.), in the absence of domain walls we find that their symmetry defects in $D$-dimensional spacetime are described by $(D-1)$-representations of a $(D-1)$-group that depends only on the spontaneous symmetry-breaking (SSB) pattern of the ordered phase. These emergent symmetries are not spontaneously broken in the ordered phase. We show that spontaneously breaking them induces a phase transition into a nontrivial disordered phase that can have symmetry-enriched (non-)Abelian topological orders, photons, and even more emergent symmetries. This SSB transition is between two distinct SSB phases--an ordinary and a generalized one--making it a possible generalized deconfined quantum critical point. We also investigate the 't Hooft anomalies of these emergent symmetries and conjecture that there is always a mixed anomaly between them and the microscopic symmetry spontaneously broken in the ordered phase. One way this anomaly can manifest is through the fractionalization of the microscopic symmetry's quantum numbers. Our results demonstrate that even the most exotic generalized symmetries emerge in ordinary phases and provide a valuable framework for characterizing them and their transitions.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"7 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient construction of the Feynman-Vernon influence functional as matrix product states 以矩阵乘积状态高效构建费曼-弗农影响函数
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-13 DOI: 10.21468/scipostphyscore.7.3.063
Chu Guo, Ruofan Chen
{"title":"Efficient construction of the Feynman-Vernon influence functional as matrix product states","authors":"Chu Guo, Ruofan Chen","doi":"10.21468/scipostphyscore.7.3.063","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.063","url":null,"abstract":"The time-evolving matrix product operator (TEMPO) method has become a very competitive numerical method for studying the real-time dynamics of quantum impurity problems. For small impurities, the most challenging calculation in TEMPO is to construct the matrix product state representation of the Feynman-Vernon influence functional. In this work we propose an efficient method for this task, which exploits the time-translationally invariant property of the influence functional. The required number of matrix product state multiplication in our method is almost independent of the total evolution time, as compared to the method originally used in TEMPO which requires a linearly scaling number of multiplications. The accuracy and efficiency of this method are demonstrated for the Toulouse model and the single impurity Anderson model.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"33 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymmetric Bethe Ansatz 非对称贝特算法
IF 5.5 2区 物理与天体物理
SciPost Physics Pub Date : 2024-09-12 DOI: 10.21468/scipostphyscore.7.3.062
Steven Glenn Jackson, Hélène Perrin, Grigori E. Astrakharchik, Maxim Olshanii
{"title":"Asymmetric Bethe Ansatz","authors":"Steven Glenn Jackson, Hélène Perrin, Grigori E. Astrakharchik, Maxim Olshanii","doi":"10.21468/scipostphyscore.7.3.062","DOIUrl":"https://doi.org/10.21468/scipostphyscore.7.3.062","url":null,"abstract":"The recently proposed exact quantum solution for two $delta$-function-interacting particles with a mass-ratio $3!:!1$ in a hard-wall box [Y. Liu, F. Qi, Y. Zhang and S. Chen, iScience 22, 181 (2019)] violates the conventional necessary condition for a Bethe Ansatz integrability, the condition being that the system must be reducible to a superposition of semi-transparent mirrors that is invariant under all the reflections it generates. In this article, we found a way to relax this condition: some of the semi-transparent mirrors of a known self-invariant mirror superposition can be replaced by the perfectly reflecting ones, thus breaking the self-invariance. The proposed name for the method is asymmetric Bethe Ansatz (asymmetric BA). As a worked example, we study in detail the bound states of the nominally non-integrable system comprised of a bosonic dimer in a $delta$-well. Finally, we show that the exact solution of the Liu-Qi-Zhang-Chen problem is a particular instance of the the asymmetric BA.","PeriodicalId":21682,"journal":{"name":"SciPost Physics","volume":"32 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142187374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信