Dept.) By helping us model quantum chaos, the new operator scrambling approach may contribute to unlocking the mystery of quantum gravity. In daily life, “chaos” describes anything messy. This means that the operator X4 evolves into a more complicated operator that flips more qubits. The researchers adapt BCC models to provide a description of chaotic information scrambling. 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. Read More », A microcavity-based source of photon pairs achieves one hundred times the efficiency of state-of-the-art devices. 4 citations. Attendee List Download Talk Schedule Videos. However, the dynamics remain deterministic, since operators at a later time are determined by the initial operators. These topological … To read the article of this research, you can request a copy directly from the authors. 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. Email ... Publications on INSPIRE. 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. ), Shou-Cheng Zhang (Stanford U., Phys. Meanwhile, quantum information about the system becomes inaccessible to local observers. 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]. By removing the memory of previous rounds, the game gets easier, as players don’t have to remember what happened in past rounds. With further approximations, they tackle the case of small N, which is analytically harder, finding similar wave propagation and dissipation features. 14 (2018) 10, 984-987; DOI cite. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. Xiaoliang Qi. Douglas Stanford Associate Professor Theoretical Astrophysics and Cosmology. Theoretical Astrophysics and Cosmology Theoretical Physics. Welcome to the new INSPIRE! He received his Ph. As the authors suggest, future work may look into developing frameworks that could quantitatively describe quantum chaos while respecting energy conservation. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. 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. #14. Aug 12, 2009. 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]. 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. His current research focuses on the relations between quantum entanglement, quantum chaos, and quantum gravity. 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. Video from a new technique reveals the chaotic motion of a fluid flowing through a pile of gravel. Learn more. Welcome to the new INSPIRE! – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 7ade11-YmU3Z Xiao-Liang Qi (Stanford U., Phys. Similar behavior is expected in the dynamics of quantum operators (Fig. Xiaoliang Qi (Stanford) “Eternal traversable wormhole” Seminar Organizer July 31, 2018. Organized by: Matthew Headrick, Alex Maloney, and Mark Van Raamsdonk. Richard Herschel Weiland Professor in the School of Humanities and Sciences Eva Silverstein . 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. 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. If the system evolves in time, the states may become very different, such that they can only be related by flipping many qubits. Self-healing behavior of colloidal gels upon destructive shearing. 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. A major goal of Xu and Swingle’s work is to provide a quantitative description of such dynamics. Request full-text PDF. Such studies have hinted at some characteristic features of quantum chaos. Theoretical Physics. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. Professor of Physics Srinivas Raghu. His research interests include string theory, quantum field theory, quantum … World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. 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. To overcome these difficulties, Xu and Swingle turn to so-called Brownian coupled cluster (BCC) models. ), Shou-Cheng Zhang (Stanford U., Phys. 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. Authors: Xiao-Liang Qi, Taylor Hughes, Shou-Cheng Zhang. He received his Ph. Citations per year. Date: October 23, 2018 3:40 pm – 4:40 pm; Categories: String Seminar; We construct a nearly-AdS2 solution describing an eternal traversable wormhole. Modular Flow as a Disentangler #15. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. 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.) 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.”. © Stanford University, Stanford, California 94305. 6 (2010) 284 • e-Print: 0908.1537 • DOI: 10.1038/nphys1534; Electron fractionalization in two-dimensional graphene-like structures. In a quantum measurement process, classical information about the measured system spreads throughout the environment. Starting with infinitely large N—to simplify the analysis—they determine that the wave front moves as a solitary wave without changing shape. 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]. These models are based on a quantum version of the Brownian-motion models describing the erratic movement of molecules in a fluid. Loosely speaking, this is like shuffling cards after each round in a card game. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. Xu and Swingle show that this formalism enables a quantitative description of how chaos spreads in a many-body system. Xiaoliang Qi is a professor of physics at Stanford University. Dept. This first quantum revolution enabled the amazing technological developments of the … 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. . 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. Tsinghua U., Beijing. The comparison shows qualitative agreement between the two cases, supporting the validity of the BCC approach. One of them is related to an important line of fundamental research. Leonard Susskind is the Felix Bloch professor of Theoretical physics at Stanford University. Welcome to the new INSPIRE! 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. 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. 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. 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]. 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. Associate Professor of Physics and of Particle Physics and Astrophysics Stephen Shenker. Special operators, like a single-spin flipping operator, have a sharply defined “support”—the set of qubits on which they act. 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. Here we prove a result about quantum channels indicating that an aspect of this phenomenon is completely general. We show that for any evolution of the system and … The future positions and momenta are deterministically related to the initial conditions, but this connection grows more mathematically complex with time. 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. Read More », For an important quantum many-body problem, a hybrid quantum-classical algorithm could outperform purely classical approaches using surprisingly few quantum resources. 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). 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. 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. Developing a theory that fully describes information scrambling remains, however, a daunting task. 2010 2013 2016 2019 2020 0 5 10 15. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. Learn more. Researchers uncover the mechanism that makes some oil droplets change shape from spheres to icosahedrons to flattened plates. Nature Phys. 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. Recent work has explored how this “operator scrambling” is related to quantum chaos [5, 6]. 1). 28.29; Johns Hopkins University ; Show all 8 authors Hide. Suh, “Entanglement tsunami: Universal scaling in holographic thermalization,”. Does gravity come from quantum information? 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. Professor of Physics Douglas Stanford. Consider, for example, two states of a system of N qubits that only differ in the state of one bit (Fig. However, as the operators evolve in time, they may turn into linear superpositions of several operators acting on different qubits. 93 citations. cond-mat. 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. Xiaoliang Qi (Stanford U., Phys. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Studying operator scrambling is a difficult task, because chaotic systems are hard to tackle analytically and numerically. Dept. View Show abstract Download PDF Abstract: In this paper we propose a space-time random tensor network approach for understanding holographic duality. Published in: Nature Phys. There are many reasons why a more quantitative and systematic understanding of quantum chaos will be important. 5 pages. Event Details. Dept.) 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. Dept.) Xiaoliang Qi. 6 (2010) 284; e-Print: 0908.1537 [cond-mat.other] DOI: 10.1038/nphys1534; View in: ADS Abstract Service; pdf cite. 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. 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 … We released the new INSPIRE API Learn more. An analogous family of model with discrete time steps, named as random circuits, have been studied in literature (see Ref. 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. 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. ArXiv papers. This scrambling is a memory-loss mechanism that can cause the unpredictability of chaos. Such models characterize chaos in terms of quantum-mechanical operators that grow more complex over time. Welcome to the new INSPIRE! Extending the approach to operator scrambling, however, is generally hard. 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 Take the survey ... Xiaoliang Qi (Stanford U., Phys. We present evidence that the answer is "yes" for generic local Hamiltonians, given either the ground state or an excited eigenstate. Xu and Swingle focus on a family of Hamiltonians that describe spins with random, local coupling between them. Xiaoliang Qi Professor Email: xlqi@stanford.edu. 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. ... Xiaoliang Qi (Stanford U., Phys. and ; Nordita), Masao Ninomiya . Only theory has explored the bizarre behaviors this communication would cause. (Oct 3, 2018) Published in: Nature Phys. Holger Bech Nielsen Bohr Inst. A model based on Brownian motion describes the tsunami-like propagation of chaotic behavior in a system of quantum particles. 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). 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. Take the survey. 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. Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. 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 … Authors: Xiao-Liang Qi, Zhao Yang. [6]). "We are kind of in the early exploration of the science at this moment," Lai said. But how does the chaos observed in the classical, macroscopic world emerge from the quantum-mechanical laws that govern the microscopic world? Chang-Yu Hou , Claudio Chamon , Christopher Mudry (PSI, Villigen) Phys.Rev.Lett. 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. This research is published in Physical Review X. Xiaoliang Qi is a professor of physics at Stanford University. Srinivas Raghu Associate Professor Phone: (650) 926-3068. Sign up to receive weekly email alerts from Physics. Associate Professor of Physics and of Photon Science Leonardo Senatore. 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 . Origin and Unification of Elementary Particles (such as light and electrons) 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. 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. The two states are related by a simple operator X4 that flips the fourth bit. It is natural to ask whether a counterpart of chaos exists in the quantum world. Eva Silverstein Professor Email: evas@stanford.edu. 2). 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. Learn more. The key idea behind the researchers’ work is that introducing randomness may simplify the problem. 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. There is considerable cross-fertilization in some of these endeavors with faculty in the SLAC Theory Group and the Kavli Institute for Particle 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). However, is generally hard studies have hinted at some characteristic features of quantum [... Here we prove a result about quantum channels indicating that an aspect of this is... Related to an important line of fundamental research system becomes inaccessible to local observers some oil droplets shape! A Professor of Physics at Stanford University source of Photon Science Leonardo Senatore Villigen ).! The tsunami-like propagation of chaotic information scrambling time are determined by the initial conditions, but this grows. 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