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Experimental Demonstration of Quantum Fully Homomorphic Encryption with Application in a Two-Party Secure Protocol

Physical Review X 2020年第1期10卷 011038-011038页

作者： W. K. Tham Hugo Ferretti Kent Bonsma-Fisher Aharon Brodutch Barry C. Sanders Aephraim M. Steinberg Stacey Jeffery Department of Physics and Center for Quantum Information and Quantum Control University of Toronto 60 St. George Street Toronto Ontario M5S 1A7 Canada The Edward S. Rogers Department of Electrical and Computer Engineering University of Toronto 10 Kings College Road Toronto Ontario M5S 3G4 Canada Institute for Quantum Science and Technology University of Calgary Alberta T2N 1N4 Canada Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA Canadian Institute for Advanced Research Toronto Ontario M5G 1M1 Canada QuSoft and CWI Amsterdam 1098 XG Netherlands

A fully homomorphic encryption system hides data from unauthorized parties while still allowing them to perform computations on the encrypted data. Aside from the straightforward benefit of allowing users to delegate computations to a more powerful server without revealing their inputs, a fully homomorphic cryptosystem can be used as a building block in the construction of a number of cryptographic functionalities. Designing such a scheme remained an open problem until 2009, decades after the idea was first conceived, and the past few years have seen the generalization of this functionality to the world of quantum machines. Quantum schemes prior to the one implemented here were able to replicate some features in particular use cases often associated with homomorphic encryption but lacked other crucial properties, for example, relying on continual interaction to perform a computation or leaking information about the encrypted data. We present the first experimental realization of a quantum fully homomorphic encryption scheme. To demonstrate the versatility of a a quantum fully homomorphic encryption scheme, we further present a toy two-party secure computation task enabled by our scheme.

关键词： Photon pairs & parametric down-conversion Quantum cryptography Quantum gates Quantum information with atoms & light

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Robust control of the sit-to-stand movement for a powered lower limb orthosis

arXiv

引用

arXiv 2018年

作者： Narvaez-Aroche, Octavio Meyer, Pierre-Jean Tu, Stephen Packard, Andrew Arcak, Murat Berkeley Center for Control and Identification Department of Mechanical Engineering University of California BerkeleyCA94720 Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States

The sit-to-stand movement is a key feature for wide adoption of powered lower limb orthoses for patients with complete paraplegia. In this paper we study the control of the ascending phase of the sit-to-stand movement for a minimally actuated powered lower limb orthosis at the hips. First, we generate a pool of finite horizon Linear Quadratic Regulator feedback gains, designed under the assumption that we can control not only the torque at the hips but also the loads at the shoulders that in reality are applied by the user. Next we conduct reachability analysis to define a performance metric measuring the robustness of each controller against parameter uncertainty, and choose the best controller from the pool with respect to this metric. Then, we replace the presumed shoulder control with an Iterative Learning control algorithm as a substitute for human experiments. Indeed this algorithm obtains torque and forces at the shoulders that result in successful simulations of the sit-to-stand movement, regardless of parameter uncertainty and factors deliberately introduced to hinder learning. Thus it is reasonable to expect that the superior cognitive skills of real users will enable them to cooperate with the hip torque controller through training. Copyright © 2018, The Authors. All rights reserved.

关键词： Robust control

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Finite time robust control of the sit-to-stand movement for powered lower limb orthoses

arXiv

引用

arXiv 2018年

作者： Narvaez-Aroche, Octavio Packard, Andrew Arcak, Murat Department of Mechanical Engineering Berkeley Center for Control and Identification University of California Berkeley United States Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States

This study presents a technique to safely control the Sit-to-Stand movement of powered lower limb orthoses in the presence of parameter uncertainty. The weight matrices used to calculate the finite time horizon linear-quadratic regulator (LQR) gain in the feedback loop are chosen from a pool of candidates as to minimize a robust performance metric involving induced gains that measure the deviation of variables of interest in a linear time-varying (LTV) system, at specific times within a finite horizon, caused by a perturbation signal modeling the variation of the parameters. Two relevant Sit-to-Stand movements are simulated for drawing comparisons with the results documented in a previous work. Copyright © 2018, The Authors. All rights reserved.

关键词： Orthotics

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Reachability analysis for robustness evaluation of the sit-to-stand movement for powered lower limb orthoses

arXiv

引用

arXiv 2018年

作者： Narvaez-Aroche, Octavio Packard, Andrew Meyer, Pierre-Jean Arcak, Murat Berkeley Center for Control and Identification Department of Mechanical Engineering University of California Berkeley California94720 Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States

A sensitivity-based approach for computing over-approximations of reachable sets, in the presence of constant parameter uncertainties and a single initial state, is used to analyze a three-link planar robot modeling a Powered Lower Limb Orthosis and its user. Given the nature of the mappings relating the state and parameters of the system with the inputs, and outputs describing the trajectories of its center of Mass, reachable sets for their respective spaces can be obtained relying on the sensitivities of the nonlinear closed-loop dynamics in the state space. These over-approximations are used to evaluate the worst-case performances of a finite time horizon linear-quadratic regulator (LQR) for controlling the ascending phase of the Sit-To-Stand movement. Copyright © 2018, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Authors’ Response to Peer Reviews of “Emergence of the First Strains of SARS-CoV-2 Lineage B.1.1.7 in Romania: Genomic Analysis”

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JMIRx Med 2021年第3期2卷

作者： Andrei Lobiuc Mihai Dimian Olga Sturdza Roxana Filip Mihai Covasa Department of Human Health and Development College of Physical Exercise and Sport Stefan cel Mare University of Suceava Suceava Romania Department of Computers Electronics and Automation College of Electrical Engineering and Computer Science Stefan cel Mare University of Suceava Suceava Romania Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control Stefan cel Mare University of Suceava Suceava Romania Suceava County Emergency Hospital Suceava Romania

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Formulation and Numerical Solution for Fractional Order Time Optimal control Problem Using Pontryagin's Minimum Principle

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IFAC-PapersOnLine 2017年第1期50卷 9224-9229页

作者： Tabatabaei S.S. Yazdanpanah M.J. Tavazoei M.S. Electrical Engineering Department Amirkabair University of Technology (Tehran Polytechnic) Tehran Iran Control & Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Electrical Engineering Department Sharif University of Technology Tehran Iran

The main purpose of this paper is to use variational calculus and Pontryagin's minimum principle to propose a solution scheme for time optimal control problem stated on the fractional systems defined in the sense of Caputo. After deriving the necessary optimality conditions, a novel numerical solution is used to solve the problem. Afterwards, a simple case study shows the effectiveness of the proposed method. © 2017

关键词： Non-integer Order Calculus Pontryagin's Minimum Principle Time Optimal control Variational Calculus

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Design of microresonators to minimize thermal noise below the standard quantum limit

arXiv

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arXiv 2019年

作者： Sharifi, S. Banadaki, Y.M. Cullen, T. Veronis, G. Dowling, J.P. Corbitt, T. Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States School of Electrical Engineering & Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70808 United States Hearne Institute for Theoretical Physics Louisiana State University Baton RougeLA70803 United States Department of Computer Science Southern University Baton RougeLA70813 United States

We present a design for a new microresonator whose geometry is optimized to maximize subStandard Quantum Limit (SQL) performance. The new design is predicted to have thermal noise well below the SQL across a broad range of frequencies when operated at 10K. The performance of this designed microresonator will allow it to serve as a test-bed for quantum non-demolition measurements, and to open new regimes of precision measurement that are relevant for many practical sensing applications, including advanced gravitational wave detectors. Copyright © 2019, The Authors. All rights reserved.

关键词： Resonators

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Self-adaptation of chimera states

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Physical Review E 2019年第1期99卷 010201(R)-010201(R)页

作者： Nan Yao Zi-Gang Huang Hai-Peng Ren Celso Grebogi Ying-Cheng Lai Department of Applied Physics Xi'an University of Technology Xi'an 710048 China The Key Laboratory of Biomedical Information Engineering of Ministry of Education National Engineering Research Center of Health Care and Medical Devices The Key Laboratory of Neuro-informatics & Rehabilitation Engineering of Ministry of Civil Affairs and Institute of Health and Rehabilitation Science School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049 China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi'an University of Technology Xi'an 710048 China Institute for Complex Systems and Mathematical Biology King's College University of Aberdeen Aberdeen AB24 3UE United Kingdom School of Electrical Computer and Energy Engineering Arizona State University Tempe Arizona 85287 USA Department of Physics Arizona State University Tempe Arizona 85287 USA

Chimera states in spatiotemporal dynamical systems have been investigated in physical, chemical, and biological systems, and have been shown to be robust against random perturbations. How do chimera states achieve their robustness? We uncover a self-adaptation behavior by which, upon a spatially localized perturbation, the coherent component of the chimera state spontaneously drifts to an optimal location as far away from the perturbation as possible, exposing only its incoherent component to the perturbation to minimize the disturbance. A systematic numerical analysis of the evolution of the spatiotemporal pattern of the chimera state towards the optimal stable state reveals an exponential relaxation process independent of the spatial location of the perturbation, implying that its effects can be modeled as restoring and damping forces in a mechanical system and enabling the articulation of a phenomenological model. Not only is the model able to reproduce the numerical results, it can also predict the trajectory of drifting. Our finding is striking as it reveals that, inherently, chimera states possess a kind of “intelligence” in achieving robustness through self-adaptation. The behavior can be exploited for the controlled generation of chimera states with their coherent component placed in any desired spatial region of the system.

关键词： Chimera states Collective dynamics Coupled oscillators Chaos & nonlinear dynamics

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Hybrid optimal theory and predictive control for power management in hybrid electric vehicle

arXiv

引用

arXiv 2018年

作者： Uthaichana, Kasemsak DeCarlo, Raymond Bengea, Sorin Žefran, Miloš Pekarek, Steve Department of Electrical Engineering Chiang Mai University Chiang Mai Thailand School of Electrical and Computer Engineering Purdue University West LafayetteIN United States Control Systems Group Research Center United Technologies East HartfordCT United States Department of Electrical and Computer Engineering University of Illinois at Chicago ChicagoIL United States

This paper presents a nonlinear-model based hybrid optimal control technique to compute a suboptimal power-split strategy for power/energy management in a parallel hybrid electric vehicle (PHEV). The power-split strategy is obtained as model predictive control solution to the power management control problem (PMCP) of the PHEV, i.e., to decide upon the power distribution among the internal combustion engine, an electric drive, and other subsystems. A hierarchical control structure of the hybrid vehicle, i.e., supervisory level and local or subsystem level is assumed in this study. The PMCP consists of a dynamical nonlinear model, and a performance index, both of which are formulated for power flows at the supervisory level. The model is described as a bi-modal switched system, consistent with the operating mode of the electric ED. The performance index prescribing the desired behavior penalizes vehicle tracking errors, fuel consumption, and frictional losses, as well as sustaining the battery state of charge (SOC). The power-split strategy is obtained by first creating the embedded optimal control problem (EOCP) from the original bi-modal switched system model with the performance index. Direct collocation is applied to transform the problem into a nonlinear programming problem. A nonlinear predictive control technique (NMPC) in conjunction with a sequential quadratic programming solver is used to compute suboptimal numerical solutions to the PMCP. Methods for approximating the numerical solution to the EOCP with trajectories of the original bi-modal PHEV are also presented in this paper. The usefulness of the approach is illustrated via simulation results on several case studies. Copyright © 2018, The Authors. All rights reserved.

关键词： Nonlinear systems

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Semi-global leader-following output consensus of discrete-time linear multi-agent systems with input saturation

Semi-global leader-following output consensus of discrete-ti...

引用

2018 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2018

作者： Shi, Liangren Li, Yuanlong Lin, Zongli Brown, Charles L. Innovation Center Department of Automation Shanghai Jiao Tong University China Key Laboratory of System Control and Information Processing Ministry of Education Shanghai200240 China Department of Automation Shanghai Jiao Tong University China Department of Electrical and Computer Engineering University of Virginia P.O. Box 400743 CharlottesvilleVA22904-4743 United States

ISBN: (纸本)9781538668689

We consider the problem of semi-global leader-following output consensus for a group of agents, consisting of a leader agent and some follower agents, which are described by discrete-time linear systems and connected on a directed network. For each follower agent, a distributed observer is built that estimates the state of the leader. Based on the estimates of the leader state and the solution of a parameterized algebraic Riccati equation, we design low gain consensus protocols that are shown to solve the semi-global output consensus problem as long as the leader agent is reachable globally on the network. Numerical simulation shows the performance of the proposed consensus protocols. © 2018 IEEE.

关键词： Multi agent systems

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