arXiv: Quantum Physics最新文献_第4页

arXiv: Quantum Physics Pub Date : 2020-12-11 DOI: 10.21203/rs.3.rs-123919/v1

J. Quach, K. McGhee, L. Ganzer, D. Rouse, B. Lovett, Erik Gauger, Jonathan Keeling, G. Cerullo, David G Lidzey, T. Virgili

{"title":"An organic quantum battery","authors":"J. Quach, K. McGhee, L. Ganzer, D. Rouse, B. Lovett, Erik Gauger, Jonathan Keeling, G. Cerullo, David G Lidzey, T. Virgili","doi":"10.21203/rs.3.rs-123919/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-123919/v1","url":null,"abstract":"\u0000 Quantum batteries harness the unique properties of quantum mechanics to enhance energy storage compared to conventional batteries. In particular, they are predicted to undergo superextensive charging, where batteries with larger capacity actually take less time to charge. Up until now however, they have not been experimentally demonstrated, due to the challenges in quantum coherent control. Here we implement an array of two-level systems coupled to a photonic mode to realise a Dicke quantum battery. Our quantum battery is constructed with a microcavity formed by two dielectric mirrors enclosing a thin ﬁlm of a fluorescent molecular dye in a polymer matrix. We use ultrafast optical spectroscopy to time resolve the charging dynamics of the quantum battery at femtosecond resolution. We experimentally demonstrate superextensive increases in both charging power and storage capacity, in agreement with our theoretical modelling. We find that decoherence plays an important role in stabilising energy storage, analogous to the role that dissipation plays in photosynthesis. This experimental proof-of-concept is a major milestone towards the practical application of quantum batteries in quantum and conventional devices. Our work opens new opportunities for harnessing collective effects in light-matter coupling for nanoscale energy capture, storage, and transport technologies, including the enhancement of solar cell efficiencies.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74399047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip 铌酸锂在绝缘体芯片上产生超亮多路能量-时间纠缠光子

arXiv: Quantum Physics Pub Date : 2020-12-11 DOI: 10.1103/PhysRevApplied.15.064059

Guang-Tai Xue, Y. Niu, Xiaoyue Liu, Jiachen Duan, Wenjun Chen, Ying Pan, Kunpeng Jia, Xiaohan Wang, Hua-Ying Liu, Yong Zhang, P. Xu, G. Zhao, Xinlun Cai, Y. Gong, Xiaopeng Hu, Zhenda Xie, Shi-ning Zhu

引用次数: 29

Learning from Physics Experiments with Quantum Computers: Applications in Muon Spectroscopy 从量子计算机的物理实验中学习:在μ介子光谱中的应用

arXiv: Quantum Physics Pub Date : 2020-12-11 DOI: 10.1103/PRXQuantum.2.020349

Sam McArdle

{"title":"Learning from Physics Experiments with Quantum Computers: Applications in Muon Spectroscopy","authors":"Sam McArdle","doi":"10.1103/PRXQuantum.2.020349","DOIUrl":"https://doi.org/10.1103/PRXQuantum.2.020349","url":null,"abstract":"Computational physics is an important tool for analysing, verifying, and -- at times -- replacing physical experiments. Nevertheless, simulating quantum systems and analysing quantum data has so far resisted an efficient classical treatment in full generality. While programmable quantum systems have been developed to address this challenge, the resources required for classically intractable problems still lie beyond our reach. In this work, we consider a new target for quantum simulation algorithms; analysing the data arising from physics experiments -- specifically, muon spectroscopy experiments. These experiments can be used to probe the quantum interactions present in condensed matter systems. However, fully analysing their results can require classical computational resources scaling exponentially with the simulated system size, which can limit our understanding of the studied system. We show that this task may be a natural fit for the coming generations of quantum computers. We use classical emulations of our quantum algorithm on systems of up to 29 qubits to analyse real experimental data, and to estimate both the near-term and error corrected resources required for our proposal. We find that our algorithm exhibits good noise resilience, stemming from our desire to extract global parameters from a fitted curve, rather than targeting any individual data point. In some respects, our resource estimates go further than some prior work in quantum simulation, by estimating the resources required to solve a complete task, rather than just to run a given circuit. Taking the overhead of observable measurement and calculating multiple datapoints into account, we find that significant challenges still remain if our algorithm is to become practical for analysing muon spectroscopy data.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74922265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Quantum battery of interacting spins with environmental noise 自旋与环境噪声相互作用的量子电池

arXiv: Quantum Physics Pub Date : 2020-12-11 DOI: 10.1103/PHYSREVA.103.033715

Fang Zhao, F. Dou, Qing Zhao

引用次数: 14

Absolute Determination of the Single-Photon Optomechanical Coupling Rate via a Hopf Bifurcation 基于Hopf分岔的单光子光力学耦合速率的绝对确定

arXiv: Quantum Physics Pub Date : 2020-12-10 DOI: 10.1103/PHYSREVAPPLIED.15.034012

P. Piergentili, Wenlin Li, R. Natali, D. Vitali, G. Di Giuseppe

引用次数: 9

Optimal Manipulation Of Correlations And Temperature In Quantum Thermodynamics 量子热力学中相关和温度的最佳操作

arXiv: Quantum Physics Pub Date : 2020-12-08 DOI: 10.13097/archive-ouverte/unige:145933

F. Clivaz

{"title":"Optimal Manipulation Of Correlations And Temperature In Quantum Thermodynamics","authors":"F. Clivaz","doi":"10.13097/archive-ouverte/unige:145933","DOIUrl":"https://doi.org/10.13097/archive-ouverte/unige:145933","url":null,"abstract":"This thesis is devoted to studying two tasks: refrigeration and the creation of correlations. In the refrigeration part, two different paradigms of cooling, namely coherent and incoherent, are defined. The connection that these paradigms have with other existing refrigeration techniques such as heat bath algorithmic cooling (HBAC), the resource theoretic approach to quantum thermodynamics, and autonomous cooling is then made. Each paradigm is then investigated on its own. This in particular allows for the derivation of a general and attainable bound. The bound is striking in its simplicity: it depends on a single parameter of the environment/machine used to cool the system of interest. The creation of correlations part is devoted to the quantitative study of how much correlations can be created for a given amount of energy. After having precisely formulated the problem of interest, we solve it for arbitrary finite dimensional bipartite systems for vanishing background temperatures. For non-vanishing background temperature the symmetry of the problem breaks down, making it much harder to tackle. When both systems are copies of each other, enough symmetry is restored to formulate an upper bound valid for all (finite) dimensional systems and prove its attainability for dimension 3 and 4. We furthermore conjecture, as well as show evidence for, the bound to be attainable in any dimension.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78085966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Variational quantum simulations of stochastic differential equations 随机微分方程的变分量子模拟

arXiv: Quantum Physics Pub Date : 2020-12-08 DOI: 10.1103/PhysRevA.103.052425

K. Kubo, Yuya O. Nakagawa, Suguru Endo, S. Nagayama

{"title":"Variational quantum simulations of stochastic differential equations","authors":"K. Kubo, Yuya O. Nakagawa, Suguru Endo, S. Nagayama","doi":"10.1103/PhysRevA.103.052425","DOIUrl":"https://doi.org/10.1103/PhysRevA.103.052425","url":null,"abstract":"Stochastic differential equations (SDE), which models uncertain phenomena as the time evolution of random variables, are exploited in various fields of natural and social sciences such as finance. Since SDEs rarely admit analytical solutions and must usually be solved numerically with huge classical-computational resources in practical applications, there is strong motivation to use quantum computation to accelerate the calculation. Here, we propose a quantum-classical hybrid algorithm that solves SDEs based on variational quantum simulation (VQS). We first approximate the target SDE by a trinomial tree structure with discretization and then formulate it as the time-evolution of a quantum state embedding the probability distributions of the SDE variables. We embed the probability distribution directly in the amplitudes of the quantum state while the previous studies did the square-root of the probability distribution in the amplitudes. Our embedding enables us to construct simple quantum circuits that simulate the time-evolution of the state for general SDEs. We also develop a scheme to compute the expectation values of the SDE variables and discuss whether our scheme can achieve quantum speed-up for the expectation-value evaluations of the SDE variables. Finally, we numerically validate our algorithm by simulating several types of stochastic processes. Our proposal provides a new direction for simulating SDEs on quantum computers.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73647648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Phase sensitivity approaching the quantum Cramér-Rao bound in a modified SU(1,1) interferometer 改进SU(1,1)干涉仪中接近量子cram<s:1> - rao界的相位灵敏度

arXiv: Quantum Physics Pub Date : 2020-12-08 DOI: 10.1103/PHYSREVA.103.032617

Jian-Dong Zhang, Chenglong You, Chuang Li, Shuai Wang

引用次数: 6

Reachability in Controlled Markovian Quantum Systems: An Operator-Theoretic Approach 受控马尔可夫量子系统的可达性:一种算子论方法

arXiv: Quantum Physics Pub Date : 2020-12-07 DOI: 10.14459/2020md1559809

F. V. Ende

{"title":"Reachability in Controlled Markovian Quantum Systems: An Operator-Theoretic Approach","authors":"F. V. Ende","doi":"10.14459/2020md1559809","DOIUrl":"https://doi.org/10.14459/2020md1559809","url":null,"abstract":"In quantum systems theory one of the fundamental problems boils down to: Given an initial state, which final states can be reached by the dynamic system in question? Formulated in the framework of bilinear control systems, the evolution shall be governed by an inevitable Hamiltonian drift term, finitely many control Hamiltonians allowing for (at least) piecewise constant control amplitudes, plus a (possibly bang-bang switchable) noise term in Kossakowski-Lindblad form. \u0000Now assuming switchable coupling of finite-dimensional systems to a thermal bath of arbitrary temperature, the core problem of reachability boils down to studying points in the standard simplex amenable to two types of controls that can be used interleaved: Permutations within the simplex, and contractions by a dissipative one-parameter semigroup. We illustrate how the solutions of the core problem pertain to the reachable set of the original controlled Markovian quantum system. This allows us to show that for global as well as local switchable coupling to a temperature-zero bath one can generate every quantum state from every initial state up to arbitrary precision. Moreover we present an inclusion for non-zero temperatures as a consequence of our results on d-majorization. \u0000Then we consider infinite-dimensional open quantum-dynamical systems following a unital Kossakowski-Lindblad master equation extended by controls. Here the drift Hamiltonian can be arbitrary, the finitely many control Hamiltonians are bounded, and the switchable noise term is generated by a single compact normal operator. Via new majorization results of ours, we show that such bilinear quantum control systems allow to approximately reach any target state majorized by the initial one, as up to now only has been known in finite-dimensional analogues.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74517075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Operational Significance of the Quantum Resource Theory of Buscemi Nonlocality Buscemi非定域量子资源理论的运算意义

arXiv: Quantum Physics Pub Date : 2020-12-07 DOI: 10.1103/PRXQUANTUM.2.020301

Patryk Lipka-Bartosik, Andrés F. Ducuara, T. Purves, Paul Skrzypczyk

{"title":"Operational Significance of the Quantum Resource Theory of Buscemi Nonlocality","authors":"Patryk Lipka-Bartosik, Andrés F. Ducuara, T. Purves, Paul Skrzypczyk","doi":"10.1103/PRXQUANTUM.2.020301","DOIUrl":"https://doi.org/10.1103/PRXQUANTUM.2.020301","url":null,"abstract":"Although entanglement is necessary for observing nonlocality in a Bell experiment, there are entangled states which can never be used to demonstrate nonlocal correlations. In a seminal paper [PRL 108, 200401 (2012)] F. Buscemi extended the standard Bell experiment by allowing Alice and Bob to be asked quantum, instead of classical, questions. This gives rise to a broader notion of nonlocality, one which can be observed for every entangled state. In this work we study a resource theory of this type of nonlocality referred to as Buscemi nonlocality. We propose a geometric quantifier measuring the ability of a given state and local measurements to produce Buscemi nonlocal correlations and establish its operational significance. In particular, we show that any distributed measurement which can demonstrate Buscemi nonlocal correlations provides strictly better performance than any distributed measurement which does not use entanglement in the task of distributed state discrimination. We also show that the maximal amount of Buscemi nonlocality that can be generated using a given state is precisely equal to its entanglement content. Finally, we prove a quantitative relationship between: Buscemi nonlocality, the ability to perform nonclassical teleportation, and entanglement. Using this relationship we propose new discrimination tasks for which nonclassical teleportation and entanglement lead to an advantage over their classical counterparts.","PeriodicalId":8484,"journal":{"name":"arXiv: Quantum Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79341507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7