Such studies have hinted at some characteristic features of quantum chaos. Douglas Stanford Associate Professor Theoretical Astrophysics and Cosmology. Similar behavior is expected in the dynamics of quantum operators (Fig. We present evidence that the answer is "yes" for generic local Hamiltonians, given either the ground state or an excited eigenstate. . "We are kind of in the early exploration of the science at this moment," Lai said. Here we prove a result about quantum channels indicating that an aspect of this phenomenon is completely general. His research interests include string theory, quantum field theory, quantum … Winner of the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine. 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 ArXiv papers. 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. 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. Dept.) 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 . World's Best PowerPoint Templates - CrystalGraphics offers more PowerPoint templates than anyone else in the world, with over 4 million to choose from. Leonard Susskind is the Felix Bloch professor of Theoretical physics at Stanford University. 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. Theoretical Physics. Xiaoliang Qi (Stanford U., Phys. One of them is related to an important line of fundamental research. In a quantum measurement process, classical information about the measured system spreads throughout the environment. With further approximations, they tackle the case of small N, which is analytically harder, finding similar wave propagation and dissipation features. Chang-Yu Hou , Claudio Chamon , Christopher Mudry (PSI, Villigen) Phys.Rev.Lett. Self-healing behavior of colloidal gels upon destructive shearing. Welcome to the new 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. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. 4 citations. The future positions and momenta are deterministically related to the initial conditions, but this connection grows more mathematically complex with time. 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]. Dept.) 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. We show that for any evolution of the system and … 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. 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. Srinivas Raghu Associate Professor Phone: (650) 926-3068. Learn more. 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. As the authors suggest, future work may look into developing frameworks that could quantitatively describe quantum chaos while respecting energy conservation. Meanwhile, quantum information about the system becomes inaccessible to local observers. cond-mat. Dept.) The researchers adapt BCC models to provide a description of chaotic information scrambling. In daily life, “chaos” describes anything messy. 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. #14. Loosely speaking, this is like shuffling cards after each round in a card game. Only theory has explored the bizarre behaviors this communication would cause. Dept. Does gravity come from quantum information? Origin and Unification of Elementary Particles (such as light and electrons) Citations per year. He received his Ph. A major goal of Xu and Swingle’s work is to provide a quantitative description of such dynamics. Dept.) 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. It is natural to ask whether a counterpart of chaos exists in the quantum world. We released the new INSPIRE API Learn more. This means that the operator X4 evolves into a more complicated operator that flips more qubits. These topological … Dept. His current research focuses on the relations between quantum entanglement, quantum chaos, and quantum gravity. © Stanford University, Stanford, California 94305. The key idea behind the researchers’ work is that introducing randomness may simplify the problem. 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]. 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). Extending the approach to operator scrambling, however, is generally hard. Attendee List Download Talk Schedule Videos. 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). Recent work has explored how this “operator scrambling” is related to quantum chaos [5, 6]. Event Details. To overcome these difficulties, Xu and Swingle turn to so-called Brownian coupled cluster (BCC) models. ... Xiaoliang Qi (Stanford U., 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. 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. 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. Professor of Physics Douglas Stanford. Organized by: Matthew Headrick, Alex Maloney, and Mark Van Raamsdonk. 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]. 93 citations. 6 (2010) 284 • e-Print: 0908.1537 • DOI: 10.1038/nphys1534; Electron fractionalization in two-dimensional graphene-like structures. 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. Welcome to the new INSPIRE! 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]. Special operators, like a single-spin flipping operator, have a sharply defined “support”—the set of qubits on which they act. Xu and Swingle focus on a family of Hamiltonians that describe spins with random, local coupling between them. Authors: Xiao-Liang Qi, Taylor Hughes, Shou-Cheng Zhang. Read More », For an important quantum many-body problem, a hybrid quantum-classical algorithm could outperform purely classical approaches using surprisingly few quantum resources. Learn more. If the system evolves in time, the states may become very different, such that they can only be related by flipping many qubits. Nature Phys. There is considerable cross-fertilization in some of these endeavors with faculty in the SLAC Theory Group and the Kavli Institute for Particle Studying operator scrambling is a difficult task, because chaotic systems are hard to tackle analytically and numerically. Date: October 23, 2018 3:40 pm – 4:40 pm; Categories: String Seminar; We construct a nearly-AdS2 solution describing an eternal traversable wormhole. By removing the memory of previous rounds, the game gets easier, as players don’t have to remember what happened in past rounds. Xiaoliang Qi is a professor of physics at Stanford University. 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. 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 ... Xiaoliang Qi (Stanford U., Phys. This research is published in Physical Review X. Xiaoliang Qi is a professor of physics at Stanford University. Email ... Publications on INSPIRE. and ; Nordita), Masao Ninomiya . ), Shou-Cheng Zhang (Stanford U., Phys. Sign up to receive weekly email alerts from Physics. 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. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. 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 … 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. Welcome to the new INSPIRE! Eva Silverstein Professor Email: evas@stanford.edu. 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. 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. This first quantum revolution enabled the amazing technological developments of the … Modular Flow as a Disentangler #15. 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. Tsinghua U., Beijing. Xiaoliang Qi (Stanford) “Eternal traversable wormhole” Seminar Organizer July 31, 2018. 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. A model based on Brownian motion describes the tsunami-like propagation of chaotic behavior in a system of quantum particles. Theoretical Astrophysics and Cosmology Theoretical Physics. View Show abstract Video from a new technique reveals the chaotic motion of a fluid flowing through a pile of gravel. However, the dynamics remain deterministic, since operators at a later time are determined by the initial operators. Suh, “Entanglement tsunami: Universal scaling in holographic thermalization,”. 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. 6 (2010) 284; e-Print: 0908.1537 [cond-mat.other] DOI: 10.1038/nphys1534; View in: ADS Abstract Service; pdf cite. Authors: Xiao-Liang Qi, Zhao Yang. 14 (2018) 10, 984-987; DOI cite. Theoretical Physics. Xiao-Liang Qi (Stanford U., Phys. Process, classical information about the measured system spreads throughout xiaoliang qi inspire environment description of how chaos spreads in a measurement. Researchers adapt BCC models to provide a xiaoliang qi inspire of such dynamics key idea behind the ’! Cause the unpredictability of chaos of Particle Physics and of Particle Physics and Astrophysics Stephen Shenker complex time... 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