Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. It is natural to ask whether a counterpart of chaos exists in the quantum world. Citations per year. 6 (2010) 284 • e-Print: 0908.1537 • DOI: 10.1038/nphys1534; Electron fractionalization in two-dimensional graphene-like structures. cond-mat. Event Details. Starting with infinitely large N—to simplify the analysis—they determine that the wave front moves as a solitary wave without changing shape. 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. 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. The key idea behind the researchers’ work is that introducing randomness may simplify the problem. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. As the authors suggest, future work may look into developing frameworks that could quantitatively describe quantum chaos while respecting energy conservation. The comparison shows qualitative agreement between the two cases, supporting the validity of the BCC approach. 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. But how does the chaos observed in the classical, macroscopic world emerge from the quantum-mechanical laws that govern the microscopic world? 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. 5 pages. 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. Theoretical Physics. Welcome to the new INSPIRE! 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. 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. Welcome to the new INSPIRE! Xiaoliang Qi. Dept.) ), Shou-Cheng Zhang (Stanford U., Phys. 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. – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 7ade11-YmU3Z Holger Bech Nielsen Bohr Inst. This means that the operator X4 evolves into a more complicated operator that flips more qubits. Recent work has explored how this “operator scrambling” is related to quantum chaos [5, 6]. Xiaoliang Qi is a professor of physics at Stanford University. In a quantum measurement process, classical information about the measured system spreads throughout the environment. 2010 2013 2016 2019 2020 0 5 10 15. 2). Take the survey. 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 … With further approximations, they tackle the case of small N, which is analytically harder, finding similar wave propagation and dissipation features. Xiaoliang Qi (Stanford U., Phys. ArXiv papers. . 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. Xu and Swingle show that this formalism enables a quantitative description of how chaos spreads in a many-body system. These topological … Professor of Physics Douglas Stanford. These models are based on a quantum version of the Brownian-motion models describing the erratic movement of molecules in a fluid. 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. Origin and Unification of Elementary Particles (such as light and electrons) Extending the approach to operator scrambling, however, is generally hard. 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. Leonard Susskind is the Felix Bloch professor of Theoretical physics at Stanford University. 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. Similar behavior is expected in the dynamics of quantum operators (Fig. Self-healing behavior of colloidal gels upon destructive shearing. 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. This scrambling is a memory-loss mechanism that can cause the unpredictability of chaos. To read the article of this research, you can request a copy directly from the authors. Date: October 23, 2018 3:40 pm – 4:40 pm; Categories: String Seminar; We construct a nearly-AdS2 solution describing an eternal traversable wormhole. 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. 4 citations. View Show abstract Theoretical Astrophysics and Cosmology Theoretical Physics. Request full-text PDF. Suh, “Entanglement tsunami: Universal scaling in holographic thermalization,”. Only theory has explored the bizarre behaviors this communication would cause. We show that for any evolution of the system and … 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. Read More », For an important quantum many-body problem, a hybrid quantum-classical algorithm could outperform purely classical approaches using surprisingly few quantum resources. Chang-Yu Hou , Claudio Chamon , Christopher Mudry (PSI, Villigen) Phys.Rev.Lett. 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. 14 (2018) 10, 984-987; DOI cite. If the system evolves in time, the states may become very different, such that they can only be related by flipping many qubits. World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Welcome to the new INSPIRE! Douglas Stanford Associate Professor Theoretical Astrophysics and Cosmology. Consider, for example, two states of a system of N qubits that only differ in the state of one bit (Fig. 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. [6]). Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. Authors: Xiao-Liang Qi, Zhao Yang. We released the new INSPIRE API Learn more. Studying operator scrambling is a difficult task, because chaotic systems are hard to tackle analytically and numerically. 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. 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. 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. ), Shou-Cheng Zhang (Stanford U., Phys. Dept.) A model based on Brownian motion describes the tsunami-like propagation of chaotic behavior in a system of quantum particles. There is considerable cross-fertilization in some of these endeavors with faculty in the SLAC Theory Group and the Kavli Institute for Particle ( Fig email alerts from Physics, xu and Swingle turn to so-called Brownian coupled cluster ( BCC ).... The unpredictability of chaos exists in the classical, macroscopic world emerge from quantum-mechanical... Chaos, the new operator scrambling, however, a microcavity-based source of Photon pairs achieves hundred... 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