27 research outputs found
Advanced Fluid Dynamics
This book provides a broad range of topics on fluid dynamics for advanced scientists and professional researchers. The text helps readers develop their own skills to analyze fluid dynamics phenomena encountered in professional engineering by reviewing diverse informative chapters herein
Potential quantum advantage for simulation of fluid dynamics
Numerical simulation of turbulent fluid dynamics needs to either parameterize
turbulence-which introduces large uncertainties-or explicitly resolve the
smallest scales-which is prohibitively expensive. Here we provide evidence
through analytic bounds and numerical studies that a potential quantum
exponential speedup can be achieved to simulate the Navier-Stokes equations
governing turbulence using quantum computing. Specifically, we provide a
formulation of the lattice Boltzmann equation for which we give evidence that
low-order Carleman linearization is much more accurate than previously believed
for these systems and that for computationally interesting examples. This is
achieved via a combination of reformulating the nonlinearity and accurately
linearizing the dynamical equations, effectively trading nonlinearity for
additional degrees of freedom that add negligible expense in the quantum
solver. Based on this we apply a quantum algorithm for simulating the
Carleman-linerized lattice Boltzmann equation and provide evidence that its
cost scales logarithmically with system size, compared to polynomial scaling in
the best known classical algorithms. This work suggests that an exponential
quantum advantage may exist for simulating fluid dynamics, paving the way for
simulating nonlinear multiscale transport phenomena in a wide range of
disciplines using quantum computing
Abstracts to Be Presented at the 2015 Supercomputing Conference
Compilation of Abstracts to be presented at the 2015 Supercomputing Conferenc
Complex extreme nonlinear waves: classical and quantum theory for new computing models
The historical role of nonlinear waves in developing the science of complexity, and also their physical feature of being a widespread paradigm in optics, establishes a bridge between two diverse and fundamental fields that can open an immeasurable number of new routes. In what follows, we present our most important results on nonlinear waves in classical and quantum nonlinear optics. About classical phenomenology, we lay the groundwork for establishing one uniform theory of dispersive shock waves, and for controlling complex nonlinear regimes through simple integer topological invariants. The second quantized field theory of optical propagation in nonlinear dispersive media allows us to perform numerical simulations of quantum solitons and the quantum nonlinear box problem. The complexity of light propagation in nonlinear media is here examined from all the main points of view: extreme phenomena, recurrence, control, modulation instability, and so forth. Such an analysis has a major, significant goal: answering the question can nonlinear waves do computation? For this purpose, our study towards the realization of an all-optical computer, able to do computation by implementing machine learning algorithms, is illustrated. The first all-optical realization of the Ising machine and the theoretical foundations of the random optical machine are here reported. We believe that this treatise is a fundamental study for the application of nonlinear waves to new computational techniques, disclosing new procedures to the control of extreme waves, and to the design of new quantum sources and non-classical state generators for future quantum technologies, also giving incredible insights about all-optical reservoir computing. Can nonlinear waves do computation? Our random optical machine draws the route for a positive answer to this question, substituting the randomness either with the uncertainty of quantum noise effects on light propagation or with the arbitrariness of classical, extremely nonlinear regimes, as similarly done by random projection methods and extreme learning machines
Does Quantum Mechanics Breed Larger, More Intricate Quantum Theories? The Case for Experience-Centric Quantum Theory and the Interactome of Quantum Theories
We pose and address the radical question that whether quantum mechanics,
known for its firm internal structure and enormous empirical success, carries
in itself the genome of larger quantum theories which have higher internal
intricacies and phenomenological versatilities. That is, on the basic level of
closed quantum systems and regardless of interpretational aspects, whether
standard quantum theory (SQT) harbors quantum theories with context-based
deformed principles or structures, having definite predictive power within
broader scopes. We answer the question in affirmative following complementary
evidence and reasoning arising from quantum-computation-based quantum
simulation and fundamental, general, abstract rationales in the frameworks of
information theory, fundamental or functional emergence, and participatory
agency. In this light, as we show, one is led to the recently proposed
experience-centric quantum theory (ECQT), which is a larger and richer theory
of quantum behaviors with drastically generalized quantum dynamics. ECQT allows
the quantum information of the closed quantum system's developed state history
to continually contribute to defining manybody interactions, Hamiltonians, and
even internal elements and ``particles'' of the total system. Hence the unitary
evolutions are continually impacted and become guidable by the agent-system's
experience. The intrinsic interplay of unitarity and non-Markovianity in ECQT
brings about a host of diverse behavioral phases, which concurrently infuse
closed and open quantum system characteristics and even surpasses the theory of
open systems in SQT. In the broader perspective, an upshot of our investigation
is the existence of the quantum interactome--the interactive landscape of all
coexisting, independent context-based quantum theories which emerge from
inferential participatory agencies--and its predictive phenomenological
utility.Comment: 54 page
Runtime I/O Re-Routing + Throttling on HPC Storage
Abstract Massively parallel storage systems are becoming more and more prevalent on HPC systems due to the emergence of a new generation of data-intensive applications. To achieve the level of I/O throughput and capacity that is demanded by data intensive applications, storage systems typically deploy a large number of storage devices (also known as LUNs or data stores). In doing so, parallel applications are allowed to access storage concurrently, and as a result, the aggregate I/O throughput can be linearly increased with the number of storage devices, reducing the application's end-to-end time. For a production system where storage devices are shared between multiple applications, contention is often a major problem leading to a significant reduction in I/O throughput. In this paper, we describe our efforts to resolve this issue in the context of HPC using a balanced re-routing + throttling approach. The proposed scheme re-routes I/O requests to a less congested storage location in a controlled manner so that write performance is improved while limiting the impact on read
Dissipative, Entropy-Production Systems across Condensed Matter and Interdisciplinary Classical VS. Quantum Physics
The thematic range of this book is wide and can loosely be described as polydispersive. Figuratively, it resembles a polynuclear path of yielding (poly)crystals. Such path can be taken when looking at it from the first side. However, a closer inspection of the book’s contents gives rise to a much more monodispersive/single-crystal and compacted (than crudely expected) picture of the book’s contents presented to a potential reader. Namely, all contributions collected can be united under the common denominator of maximum-entropy and entropy production principles experienced by both classical and quantum systems in (non)equilibrium conditions. The proposed order of presenting the material commences with properly subordinated classical systems (seven contributions) and ends up with three remaining quantum systems, presented by the chapters’ authors. The overarching editorial makes the presentation of the wide-range material self-contained and compact, irrespective of whether comprehending it from classical or quantum physical viewpoints