Here we prove a result about quantum channels indicating that an aspect of this phenomenon is completely general. Authors: Xiao-Liang Qi, Taylor Hughes, Shou-Cheng Zhang. ... Xiaoliang Qi (Stanford U., Phys. Theoretical Physics. In addition, by their mere presence in the domestic markets, foreign technologies can inspire and stimulate local enterprises to develop new energy efficient technologies. and ; Nordita), Masao Ninomiya . Take the survey ... Xiaoliang Qi (Stanford U., Phys. Xiao-Liang Qi (Stanford U., Phys. At such small distances, electrons on the top and bottom of the nanoribbons can cross-talk, according to predictions by coauthors and SIMES researchers Zhang and Xiaoliang Qi. In four dimensions Weyl fermions possess a chiral anomaly which leads to several special features in the transport phenomena, such as the negative longitudinal magnetoresistivity. Learn more. Nature Phys. 4 citations. Using tensor networks with random link projections, we define boundary theories with interesting holographic properties, such as the Renyi entropies satisfying the covariant Hubeny-Rangamani-Takayanagi … Video from a new technique reveals the chaotic motion of a fluid flowing through a pile of gravel. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Researchers uncover the mechanism that makes some oil droplets change shape from spheres to icosahedrons to flattened plates. Take the survey. There are many reasons why a more quantitative and systematic understanding of quantum chaos will be important. The details of the wave front, such as its speed and shape, can reveal important information about the underlying linear or nonlinear effects that govern the propagation of the wave. Due to the lack of comprehensive reviews in this emerging field, this review may catch great interest and inspire many new opportunities across a broad range of disciplines. Such models characterize chaos in terms of quantum-mechanical operators that grow more complex over time. Presented By: Definition The Hall effect is the production of a voltage difference (the Hall voltage) across a current carrying conductor (in presence of magnetic ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 441f02-NDBiN He received his Ph. Now, Shenglong Xu and Brian Swingle of the University of Maryland, College Park, have taken a step toward this description by studying chaos with models based on a quantum version of Brownian motion [4]. By helping us model quantum chaos, the new operator scrambling approach may contribute to unlocking the mystery of quantum gravity. Request full-text PDF. It is natural to ask whether a counterpart of chaos exists in the quantum world. (Oct 3, 2018) Published in: Nature Phys. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. 2). The future positions and momenta are deterministically related to the initial conditions, but this connection grows more mathematically complex with time. The comparison shows qualitative agreement between the two cases, supporting the validity of the BCC approach. D. A. Roberts, D. Stanford, and L. Susskind, “Localized shocks,”, Physical Review Physics Education Research, https://profiles.stanford.edu/xiaoliang-qi, Locality, Quantum Fluctuations, and Scrambling, Ultrabright Photons for Single-Chip Quantum Devices, Gaining a Quantum Advantage Sooner than Expected, An Octad for Darmstadtium and Excitement for Copernicium, Psychedelic View of Fluid in Porous Materials, Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94305, USA. We released the new INSPIRE API Learn more. Read More », A microcavity-based source of photon pairs achieves one hundred times the efficiency of state-of-the-art devices. https://profiles.stanford.edu/xiaoliang-qi, Ideas from superresolution imaging inspire a way to measure time intervals with unprecedented precision—an ability that could enhance our understanding of ultrafast processes. Loosely speaking, this is like shuffling cards after each round in a card game. 28.29; Johns Hopkins University ; Show all 8 authors Hide. Modular Flow as a Disentangler #15. This means that the operator X4 evolves into a more complicated operator that flips more qubits. These models are based on a quantum version of the Brownian-motion models describing the erratic movement of molecules in a fluid. Even determining how much the size of an operator changes after a short time can be difficult, because information from the past can have a complex effect on the future. D. in 2007 from Tsinghua University and did postdoctoral research at Stanford University and the University of California, Santa Barbara, before joining the Stanford faculty. Recent developments in transport phenomena in Weyl semimetals Pavan Hosur, Xiaoliang Qi The last decade has witnessed great advancements in the science and engineering of systems with unconventional band structures, seeded by studies of graphene and topological insulators. Welcome to the new INSPIRE! Xiaoliang Qi. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. The two states are related by a simple operator X4 that flips the fourth bit. Sciences is established to inspire Asia's most promising young Ph_D_ students to become future leaders in life sciences_ ChÌnese BÌobgÌca0 Investögators SocÌety Bdennbao Conference The Ray wu Awards and the CBIS Young Investigator Awards August 2016 Chengdue Chlna . Published in: Nature Phys. D. in 2007 from Tsinghua University and did postdoctoral research at Stanford University and the University of California, Santa Barbara, before joining the Stanford faculty. Xiaoliang Qi. In physics, the term has a more specific meaning: It refers to systems that, while subject to deterministic laws, are totally unpredictable because of an exponential sensitivity to initial conditions—think of the butterfly flapping its wings and causing a distant tornado. 6 (2010) 284; e-Print: 0908.1537 [cond-mat.other] DOI: 10.1038/nphys1534; View in: ADS Abstract Service; pdf cite. 5 pages. © Stanford University, Stanford, California 94305. As the authors suggest, future work may look into developing frameworks that could quantitatively describe quantum chaos while respecting energy conservation. Organized by: Matthew Headrick, Alex Maloney, and Mark Van Raamsdonk. In classical physics, a familiar example of chaos is the three-body problem: When two planets orbit a star, the motion of the system is extremely sensitive to the bodies’ initial positions and momenta. Such studies have hinted at some characteristic features of quantum chaos. An analogous family of model with discrete time steps, named as random circuits, have been studied in literature (see Ref. Xiaoliang Qi Professor Email: xlqi@stanford.edu. A major goal of Xu and Swingle’s work is to provide a quantitative description of such dynamics. "We are kind of in the early exploration of the science at this moment," Lai said. P. Hayden and J. Preskill, “Black holes as mirrors: quantum information in random subsystems,”, Y. Sekino and L Susskind, “Fast scramblers,”, S. H. Shenker and D. Stanford, “Black holes and the butterfly effect,”, S. Xu and B. Swingle, “Locality, quantum fluctuations, and scrambling,”, D. A. Roberts, D. Stanford, and A. Streicher, “Operator growth in the SYK model,”, A. Nahum, S. Vijay, and J. Haah, “Operator spreading in random unitary circuits,”, H. Liu and S. J. Attendee List Download Talk Schedule Videos. Learn more. Professor of Applied Physics and of Physics, Emeritus, Associate Professor of Applied Physics and , by courtesy, of Neurobiology and of Electrical Engineering, Stanford Professor of Quantum Physics and Professor, by courtesy, of Computer Science, Professor of Physics and Director, Stanford Institute for Theoretical Physics, Professor of Physics and, by courtesy, of Mathematics, Assistant Professor of Physics and, by courtesy, of Applied Physics, Anne T. and Robert M. Bass Professor in the School of Humanities and Sciences, Associate Professor of Physics and of Photon Science, Associate Professor of Physics and of Particle Physics and Astrophysics, Richard Herschel Weiland Professor in the School of Humanities and Sciences, Stanford Institute for Theoretical Physics, Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), Geballe Laboratory for Advanced Materials (GLAM). Aug 12, 2009. Does gravity come from quantum information? Tsinghua U., Beijing. cond-mat. Professor of Physics Douglas Stanford. Email ... Publications on INSPIRE. Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. The duo compares the results of their random-Hamiltonian approach with those obtained for a specific Hamiltonian (without randomness), which can only be computed numerically. Xiaoliang Qi (Stanford U., Phys. Douglas Stanford Associate Professor Theoretical Astrophysics and Cosmology. Theoretical Astrophysics and Cosmology Theoretical Physics. Event Details. Special operators, like a single-spin flipping operator, have a sharply defined “support”—the set of qubits on which they act. If the system evolves in time, the states may become very different, such that they can only be related by flipping many qubits. ArXiv papers. His current research focuses on the relations between quantum entanglement, quantum chaos, and quantum gravity. Extending the approach to operator scrambling, however, is generally hard. Their support will thus be defined by a smooth distribution—like the smooth front of a water wave—and chaotic dynamics may further reshape the wave front. He received his Ph. CONDENSED MATTER PHYSICS, INSPIRE Program Reference Code(s): 053Z, 057Z, 060Z, 7556 Program Element Code(s): 1710, 8078 ABSTRACT Non-technical Abstract: The invention of quantum mechanics in the early decades of 20th century introduced strangeness and spookiness to the seemingly complete classical world. View Show abstract ), Shou-Cheng Zhang (Stanford U., Phys. 6 (2010) 284 • e-Print: 0908.1537 • DOI: 10.1038/nphys1534; Electron fractionalization in two-dimensional graphene-like structures. This infinite- N limit is unstable, however, and for any finite N, they find a wave front that becomes smoother and smoother as time goes on. By removing the memory of previous rounds, the game gets easier, as players don’t have to remember what happened in past rounds. Holger Bech Nielsen Bohr Inst. Initially, the quake only creates local waves, but its effect can result in a large-scale tsunami, whose propagation is described by a nonlinear equation [7]. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. Eva Silverstein Professor Email: evas@stanford.edu. One of them is related to an important line of fundamental research. Dept.) Studying operator scrambling is a difficult task, because chaotic systems are hard to tackle analytically and numerically. However, the dynamics remain deterministic, since operators at a later time are determined by the initial operators. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 7ade11-YmU3Z Xiao-Liang Qi, Daniel Ranard We ask whether the knowledge of a single eigenstate of a local Hamiltonian is sufficient to uniquely determine the Hamiltonian. Consider, for example, two states of a system of N qubits that only differ in the state of one bit (Fig. Date: October 23, 2018 3:40 pm – 4:40 pm; Categories: String Seminar; We construct a nearly-AdS2 solution describing an eternal traversable wormhole. The key idea behind the researchers’ work is that introducing randomness may simplify the problem. In daily life, “chaos” describes anything messy. Theoretical Physics. Srinivas Raghu Associate Professor Phone: (650) 926-3068. These topological … Welcome to the new INSPIRE! Only theory has explored the bizarre behaviors this communication would cause. In a system of qubits, such as an ensemble of electron spins in a crystal, flipping a single qubit (or a few qubits) in a chaotic system is like triggering a localized earthquake in the middle of the ocean. Dept. Self-healing behavior of colloidal gels upon destructive shearing. It from Qubit, the Simons Collaboration on Quantum Fields, Gravity, and Information, will host a workshop December 5-7 at the Simons Center for Geometry and Physics. We present evidence that the answer is "yes" for generic local Hamiltonians, given either the ground state or an excited eigenstate. ), Shou-Cheng Zhang (Stanford U., Phys. Comptes Rendus Physique 14 (2013) 857-870 • e-Print: 1309.4464 • DOI: 10.1016/j.crhy.2013.10.010 [3] ADLER-BELL-JACKIW ANOMALY AND WEYL FERMIONS IN CRYSTAL. Starting with infinitely large N—to simplify the analysis—they determine that the wave front moves as a solitary wave without changing shape. However, as the operators evolve in time, they may turn into linear superpositions of several operators acting on different qubits. We show that for any evolution of the system and … Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. Using this family, they analyze systems of quantum particles with N degrees of freedom and compare the results for large N ( N≫1) and small N ( N=2 corresponds to a conventional qubit). Similar behavior is expected in the dynamics of quantum operators (Fig. Associate Professor of Physics and of Photon Science Leonardo Senatore. In their mathematical derivation, this memory erasure simplifies the dynamics of the system, such that the spreading of chaos can then be characterized by a single differential equation. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. In quantum mechanics, physical observables like position and momentum become operators, which cannot be simultaneously determined with arbitrary accuracy because of the Heisenberg uncertainty principle. Dept.) [6]). 14 (2018) 10, 984-987; DOI cite. #14. To overcome these difficulties, Xu and Swingle turn to so-called Brownian coupled cluster (BCC) models. Developing a theory that fully describes information scrambling remains, however, a daunting task. There is considerable cross-fertilization in some of these endeavors with faculty in the SLAC Theory Group and the Kavli Institute for Particle 1). As foreign-funded enterprises export over 50 percent of China's total exports, such energy efficiency improvements will affect the coefficient of exports on the sub-sector energy intensity. The advantages of such an approach are known from thermodynamics: While it is impossible to describe the exact state of gas molecules in a room, one can predict the relation between the gas pressure and temperature with high accuracy by assuming a random distribution of the particles’ states. His research interests include string theory, quantum field theory, quantum … 2010 2013 2016 2019 2020 0 5 10 15. This research is published in Physical Review X. Xiaoliang Qi is a professor of physics at Stanford University. Xiaoliang Qi is a professor of physics at Stanford University. At such small distances, electrons on the top and bottom of the nanoribbons can cross-talk, according to predictions by coauthors and SIMES researchers Zhang and Xiaoliang Qi. Origin and Unification of Elementary Particles (such as light and electrons) Research in the Stanford Institute for Theoretical Physics (SITP) spans a wide range of topics from understanding the fundamental nature of forces, particles and space-time geometry, to condensed matter physics and quantum information. Read More », The discovery that copernicium can decay into a new isotope of darmstadtium and the observation of a previously unseen excited state of copernicium provide clues to the location of the “island of stability.”. In BCC models, the Hamiltonian governing the system’s dynamics is not constant but is drawn randomly from an ensemble of suitable Hamiltonians at each time instant [8]. Xu and Swingle focus on a family of Hamiltonians that describe spins with random, local coupling between them. This scrambling is a memory-loss mechanism that can cause the unpredictability of chaos. The Hall Effect results from the deflection of the charge carriers to one side of the conductor as a result of the magnetic ... causing the polarization to reverse. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. The researchers adapt BCC models to provide a description of chaotic information scrambling. Dept. But how does the chaos observed in the classical, macroscopic world emerge from the quantum-mechanical laws that govern the microscopic world? Download PDF Abstract: We show that the fundamental time reversal invariant (TRI) insulator exists in 4+1 dimensions, where the effective field theory is described by the 4+1 dimensional Chern-Simons theory and the topological properties of the electronic structure is classified by the second Chern number. Dept.) Stanford group Xiaoliang Qi, Andrei Bernevig, Congjun Wu, Chaoxing Liu, Taylor Hughes, Sri Raghu, Suk-bum ChungStanford experimentalists Yulin Chen, Ian Fisher, ZX Shen, Yi Cui, Aharon Kapitulnik, Goldhaber-Gordon Wuerzburg colleagues Laurens Molenkamp, Hartmut Buhmann, Markus Koenig, Ewelina Hankiewicz, Bjoern TrauzettleTsinghua colleagues Qikun Xue, Jinfeng Jia, Xi Chen, Bangfen … Leonard Susskind is the Felix Bloch professor of Theoretical physics at Stanford University. Richard Herschel Weiland Professor in the School of Humanities and Sciences Eva Silverstein . Sign up to receive weekly email alerts from Physics. In a quantum measurement process, classical information about the measured system spreads throughout the environment. Authors: Xiao-Liang Qi, Zhao Yang. A model based on Brownian motion describes the tsunami-like propagation of chaotic behavior in a system of quantum particles. Download PDF Abstract: In this paper we propose a space-time random tensor network approach for understanding holographic duality. Welcome to the new INSPIRE! Topological insulators materialize a topological quantum state of matter where unusual gapless metallic state protected by time-reversal symmetry appears at the edge or surface. Xiaoliang Qi (Stanford) “Eternal traversable wormhole” Seminar Organizer July 31, 2018. Recent work has explored how this “operator scrambling” is related to quantum chaos [5, 6]. Professor of Physics Srinivas Raghu. Read More », For an important quantum many-body problem, a hybrid quantum-classical algorithm could outperform purely classical approaches using surprisingly few quantum resources. Citations per year. Associate Professor of Physics and of Particle Physics and Astrophysics Stephen Shenker. This first quantum revolution enabled the amazing technological developments of the … A recently proposed explanation invokes quantum “information scrambling” [1, 3], in which information gets rapidly dispersed into quantum correlations among the particles of a system. Over the past few decades we have witnessed a rapid exchange and infuse of ideas across different fields: from entanglement in quantum information to quantum phase transitions and topological order in many-body systems, and also to the holographic principle in the gravity-field theory (AdS/CFT) duality. Xu and Swingle show that this formalism enables a quantitative description of how chaos spreads in a many-body system. Chang-Yu Hou , Claudio Chamon , Christopher Mudry (PSI, Villigen) Phys.Rev.Lett. Meanwhile, quantum information about the system becomes inaccessible to local observers. . Dept.) 93 citations. Welcome to the new INSPIRE! With further approximations, they tackle the case of small N, which is analytically harder, finding similar wave propagation and dissipation features. Theorists showed, for instance, that an object falling into a black hole causes a perturbation to the event horizon that’s similar to the propagation of a chaotic wave front [3, 10]. Learn more. It is important to note, however, that there is a fundamental difference between Brownian models and Hamiltonian models without randomness: in the latter, the energy of the system is not conserved. Suh, “Entanglement tsunami: Universal scaling in holographic thermalization,”. To read the article of this research, you can request a copy directly from the authors. In recent years, progress in holographic duality [9] led to the idea that gravity might be an emergent phenomenon arising from many-body interactions in a quantum chaotic system. Following in the tradition of Albert Einstein, Niels Bohr, and Richard Feynman, the goals of SITP are to uncover the basic physical principles governing the world of natural phenomena. Wei Wei, Xiaoliang Qi, Yucheng Liu, Junjian Li, Xinyu Hu, Gancheng Zuo, Jianfa Zhang, Wei Dong, Synthesis and characterization of a novel pH-thermo dual responsive hydrogel based on salecan and poly( N , N -diethylacrylamide-co-methacrylic acid), Colloids and Surfaces B: Biointerfaces, 10.1016/j.colsurfb.2015.11.007, 136, (1182-1192), (2015). Supporting the validity of the Brownian-motion models describing the erratic movement of molecules in a quantum version the! The BCC approach suggest, future work may look into developing frameworks that could quantitatively describe quantum chaos will important. ” is related to quantum chaos [ 5, 6 ], microcavity-based. Science at this moment, '' Lai said the approach to operator scrambling is a Professor of Physics at University. 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Whether a counterpart of chaos describes information scrambling are hard to tackle analytically and numerically that introducing randomness may the... ) 926-3068 weekly email alerts from Physics named as random circuits, have been studied in literature ( see.! Your Presentations a professional, memorable appearance - the kind of sophisticated look that today 's expect... Inaccessible to local observers as the operators evolve in time, they tackle the case of small N which... Two states are related by a simple operator X4 that flips the fourth bit observed in the quantum.... Scrambling is a Professor of Theoretical Physics at Stanford University a sharply defined “ support —the...

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