scholarly journals Quantum Control for Trapped Particles at Matter Surface

2021 ◽  
Author(s):  
Quan-Fang Wang
Keyword(s):  
External Force ◽  
Optical Lattice ◽  
Quantum Control ◽  
Target System ◽  
Trapped Particles ◽  
Physical Constraints ◽  
Chemical Surface ◽  
Lagrange System ◽  
Physical Background ◽  
Surface Metal

In this theoretic work, trapped particles at matter surface to be considered as target system of quantum control. At the framework of variational method in Hilbert space, it would be quite interesting for us to explore particles which is trapped via optical lattice or other kinds of constraints at a matter surface (metal, crystal). The aim of this task is to survey theoretical control for quantum particles as they are appeared and trapped at matter surface (cf. [1]). The physical background of this work is laying on the specified particles motion or reaction under a certain chemical surface. As is well known, one can move a particle at surface smoothly through a point force above it or according to a proper angle, such quantum mechanical motion had already been achieved by the IBM team several years ago. At the viewpoint of quantum control, what is theoretic support? Can we make these control theoretically, computationally or experimentally? In fact, free trapped particles had been considered by scientists and researchers at worldwide scale. The most exciting things in this study is to take particle as target as it constrained on a surface. Theoretically, this work is to describe quantum control system consisting of time-varying Schrodinger equation at physical constraints condition. Then to apply control theory to quantum system of trapped particles, find and characterize optimal quantum control. Further, to compose optimality system (Euler-Lagrange system). Comprising of control free trapped particle, this work is focusing on control taking place at matter surface (on it particle is trapped), that is, try to discuss the external force constrain (e.g. optical lattice) and surface constrain are acting at particle together. Amazing result is desired in control of different multi-forces as control inputs, what would be happened as a particle changing its position, displacement or status under trapped situation? can we make a trapped chemical quantum well, or a physical optical lattice which worked using external force? what is extension of such kind of works at a variety of fields? whether the general quantum control is worked in this case? It is the purpose to solve these mysteries in this work, and report the initial conclusion of theoretic aspect for trapped particle at matter surface.

scholarly journals Quantum Control for Trapped Particles at Matter Surface

2021 ◽  
Author(s):  
Quan-Fang Wang
Keyword(s):  
External Force ◽  
Optical Lattice ◽  
Quantum Control ◽  
Target System ◽  
Trapped Particles ◽  
Physical Constraints ◽  
Chemical Surface ◽  
Lagrange System ◽  
Physical Background ◽  
Surface Metal

In this theoretic work, trapped particles at matter surface to be considered as target system of quantum control. At the framework of variational method in Hilbert space, it would be quite interesting for us to explore particles which is trapped via optical lattice or other kinds of constraints at a matter surface (metal, crystal). The aim of this task is to survey theoretical control for quantum particles as they are appeared and trapped at matter surface (cf. [1]). The physical background of this work is laying on the specified particles motion or reaction under a certain chemical surface. As is well known, one can move a particle at surface smoothly through a point force above it or according to a proper angle, such quantum mechanical motion had already been achieved by the IBM team several years ago. At the viewpoint of quantum control, what is theoretic support? Can we make these control theoretically, computationally or experimentally? In fact, free trapped particles had been considered by scientists and researchers at worldwide scale. The most exciting things in this study is to take particle as target as it constrained on a surface. Theoretically, this work is to describe quantum control system consisting of time-varying Schrodinger equation at physical constraints condition. Then to apply control theory to quantum system of trapped particles, find and characterize optimal quantum control. Further, to compose optimality system (Euler-Lagrange system). Comprising of control free trapped particle, this work is focusing on control taking place at matter surface (on it particle is trapped), that is, try to discuss the external force constrain (e.g. optical lattice) and surface constrain are acting at particle together. Amazing result is desired in control of different multi-forces as control inputs, what would be happened as a particle changing its position, displacement or status under trapped situation? can we make a trapped chemical quantum well, or a physical optical lattice which worked using external force? what is extension of such kind of works at a variety of fields? whether the general quantum control is worked in this case? It is the purpose to solve these mysteries in this work, and report the initial conclusion of theoretic aspect for trapped particle at matter surface.

scholarly journals Quantum Control of BEC in Optical Lattice

2021 ◽  
Author(s):  
Quan-Fang Wang
Keyword(s):  
Low Temperature ◽  
External Force ◽  
Optical Lattice ◽  
Quantum Control ◽  
Spatial Dimension ◽  
Computational Approach ◽  
High Spatial Dimension ◽  
Bose Einstein

In this paper, it would be worthwhile to consider the theoretical and computational approach of controlling Bose-Einstein Condensates (BEC). In high spatial dimension (2D/3D) case, the BEC system is controlled under external force in trapped optical lattice at low temperature. Finally, our conclusion is in accordance with the results in physics/chemistry realms.

scholarly journals Quantum Control of BEC in Optical Lattice

2021 ◽  
Author(s):  
Quan-Fang Wang
Keyword(s):  
Low Temperature ◽  
External Force ◽  
Optical Lattice ◽  
Quantum Control ◽  
Spatial Dimension ◽  
Computational Approach ◽  
High Spatial Dimension ◽  
Bose Einstein

In this paper, it would be worthwhile to consider the theoretical and computational approach of controlling Bose-Einstein Condensates (BEC). In high spatial dimension (2D/3D) case, the BEC system is controlled under external force in trapped optical lattice at low temperature. Finally, our conclusion is in accordance with the results in physics/chemistry realms.

scholarly journals Experimental implementation of precisely tailored light-matter interaction via inverse engineering

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Ying Yan ◽  
Chunyan Shi ◽  
Adam Kinos ◽  
Hafsa Syed ◽  
Sebastian P. Horvath ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Quantum Control ◽  
Quantum Information Processing ◽  
Rare Earth Ions ◽  
Adiabatic Process ◽  
Physical Constraints ◽  
Shortcuts To Adiabaticity ◽  
Experimental Implementation ◽  
Speed Up ◽  
Light Matter Interaction

AbstractAccurate and efficient quantum control in the presence of constraints and decoherence is a requirement and a challenge in quantum information processing. Shortcuts to adiabaticity, originally proposed to speed up the slow adiabatic process, have nowadays become versatile toolboxes for preparing states or controlling the quantum dynamics. Unique shortcut designs are required for each quantum system with intrinsic physical constraints, imperfections, and noise. Here, we implement fast and robust control for the state preparation and state engineering in a rare-earth ions system. Specifically, the interacting pulses are inversely engineered and further optimized with respect to inhomogeneities of the ensemble and the unwanted interaction with other qubits. We demonstrate that our protocols surpass the conventional adiabatic schemes, by reducing the decoherence from the excited-state decay and inhomogeneous broadening. The results presented here are applicable to other noisy intermediate-scale quantum systems.

scholarly journals Quantum Optimal Control of Bose-Einstein-Condensates in 3D

2021 ◽  
Author(s):  
Quan-Fang Wang
Keyword(s):  
Particle Physics ◽  
Quantum Control ◽  
System Control ◽  
Three Dimension ◽  
Trapped Particles ◽  
Electro Magnetic Field ◽  
Quantum Control Theory ◽  
Electro Magnetic ◽  
Bose Einstein ◽  
Future Work

Quantum control of Bose-Einstein-Condensates (BEC) had been found for one and two dimension cases. Firstly in this paper, we want to control BEC at electro-magnetic field in three dimension optical lattice theoretically. The trapped particles in constructed lattices can be made and controlled by optical pulse, and known as molasses. It is evident that quantum control theory is worked for physical particles in BEC status. It is a survey with system control and quantum particle physics. Future work is to focus on collaborating with real laboratory.

scholarly journals Connection between Inverse Engineering and Optimal Control in Shortcuts to Adiabaticity

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 84
Author(s):  
Qi Zhang ◽  
Xi Chen ◽  
David Guéry-Odelin
Keyword(s):  
Optimal Control ◽  
Quantum Control ◽  
Cold Atoms ◽  
Spin Dynamics ◽  
Harmonic Trap ◽  
High Fidelity ◽  
Physical Constraints ◽  
Atomic Transport ◽  
Shortcuts To Adiabaticity ◽  
Very High

We consider fast high-fidelity quantum control by using a shortcut to adiabaticity (STA) technique and optimal control theory (OCT). Three specific examples, including expansion of cold atoms from the harmonic trap, atomic transport by moving harmonic trap, and spin dynamics in the presence of dissipation, are explicitly detailed. Using OCT as a qualitative guide, we demonstrate how STA protocols designed from inverse engineering method can approach with very high precision optimal solutions built about physical constraints, by a proper choice of the interpolation function and with a very reduced number of adjustable parameters.

scholarly journals Chaos-assisted tunneling resonances in a synthetic Floquet superlattice

2020 ◽  
Vol 6 (38) ◽  
pp. eabc4886
Author(s):  
M. Arnal ◽  
G. Chatelain ◽  
M. Martinez ◽  
N. Dupont ◽  
O. Giraud ◽  
...  
Keyword(s):  
Optical Lattice ◽  
Quantum Chaos ◽  
Quantum Control ◽  
Quantum Computer ◽  
Quantum Simulation ◽  
The Past ◽  
Range Transport ◽  
Assisted Tunneling ◽  
Bose Einstein ◽  
Tunneling Resonances

The field of quantum simulation, which aims at using a tunable quantum system to simulate another, has been developing fast in the past years as an alternative to the all-purpose quantum computer. So far, most efforts in this domain have been directed to either fully regular or fully chaotic systems. Here, we focus on the intermediate regime, where regular orbits are surrounded by a large sea of chaotic trajectories. We observe a quantum chaos transport mechanism, called chaos-assisted tunneling, that translates in sharp resonances of the tunneling rate and provides previously unexplored possibilities for quantum simulation. More specifically, using Bose-Einstein condensates in a driven optical lattice, we experimentally demonstrate and characterize these resonances. Our work paves the way for quantum simulations with long-range transport and quantum control through complexity.

scholarly journals The Wave Energy Converter Control Competition: Overview

2019 ◽  
Author(s):  
John Ringwood ◽  
Francesco Ferri ◽  
Nathan Tom ◽  
Kelley Ruehl ◽  
Nicols Faedo ◽  
...  
Keyword(s):  
Wave Energy ◽  
Average Power ◽  
Evaluation Criteria ◽  
Wave Energy Converter ◽  
Target System ◽  
Special Session ◽  
Energy Converter ◽  
Physical Constraints ◽  
Power Peak ◽  
Tank Test

Abstract Over the past two years, a wave energy converter control systems competition (WECCCOMP) has been in progress, with the objective of comparing different wave energy converter (WEC) control paradigms on a standard benchmark problem. The target system is a point absorber, corresponding to a single float with an absolute reference, of the WaveStar WEC prototype. The system was modelled in WEC-Sim, with the hydrodynamic parameters validated against tank test data. Competitors were asked to design and implement a WEC control system for this model, with performance evaluated across six sea states. The evaluation criteria included a weighted combination of average converted power, peak/average power, and the degree to which the system physical constraints were exploited or temporarily exceeded. This paper provides an overview of the competition, which includes a comparative evaluation of the entries and their performance on the simulation model. It is intended that this paper will act as an anchor presentation in a special session on WECCCOMP at OMAE 2019, with other papers in the special session contributed by the competitors, describing in detail the control algorithms and the results achieved over the various sea states.

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