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Showing 1 to 20 of 74 for “"Quantum control"”.
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Quantum Control in Dissipative Systems
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-11T20:37:39Z No. of bitstreams: 1 Dong_Ke.pdf: 1438135 bytes, checksum: de88ac169d3325e5c5a1fa36ff31b681 (MD5)
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Classical and quantum control in nanosystems
… a platform to study and demonstrate new forms of control over both quantum and classical degrees of freedom in solid-state systems. To support this claim, I present a series of theoretical discussions that demonstrate how static and/or time-varying fields can be used to control spin degrees of …
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STUDIES IN QUANTUM CONTROL AND QUANTUM INFORMATION
This thesis translates abstract concepts from quantum information theory into physical control protocols designed for cooling, error recovery, and quantum metrology. The physical platforms utilized in this work include qubits, quantum harmonic oscillators, and their composite systems. In the first …
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Quantum control of spin systems in diamond
The precise control of a system which behaves according to the principles of quantum mechanics is an essential task in order to fully harness the unique properties of quantum mechanics, such as superposition and entanglement, for practical applications. Leveraging the quantum nature of the system …
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Dynamically Corrected Quantum Control: A Geometrical Framework
Implementing high-fidelity quantum control and suppressing the unwanted environmental noise has been one of the essential challenges in developing quantum information technologies. In the past, driving pulse sequences based on Dirac delta functions or square wave functions, such as Hahn spin echo …
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Femtosecond quantum control and adaptive polarization pulse shaping
Adaptive Femtosekunden-Quantenkontrolle hat sich in den letzten Jahren als eine sehr erfolgreiche Methode in vielen wissenschaftlichen Gebieten wie Physik, Chemie oder Biologie erwiesen. Eine Vielzahl von Quantensystemen und insbesondere Moleküle, die eine chemische Reaktion durchlaufen, sind durch …
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Spingineering : quantum control in the presence of relaxation
For certain problems quantum resources can exponentially increase computing power, but these quantum resources are very fragile in practice. When a quantum system interacts with an external environment, it undergoes decoherence - the loss of quantum correlation - and relaxation - the loss of energy …
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Investigations on resource-limited quantum control through NMR pulses
Universal high fidelity coherent control over large Hilbert spaces is essential for quantum information processing to become a useful tool in science, engineering, communications and computation. The development of methods for coherent control are however still in their infancy. In particular, very …
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Compensating sequences for robust quantum control of trapped-ion qubits
Universal quantum computation requires precision control of the dynamics of qubits. Frequently accurate quantum control is impeded by systematic drifts and other errors. Compensating composite pulse sequences are a resource efficient technique for quantum error reduction. This work describes …
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Quantum control of optically active defects in the solid state
A common thread in the realization of quantum computers, quantum networks, and quantum sensors is the search for promising physical platforms. The dislocations of atoms in the solid state, referred to as defects, have historically been deemed undesirable as they can be deleterious to the operation …
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Quantum control of many-particle systems via shortcuts to adiabaticity
A major barrier for the development of new quantum technologies is fast and robust methods for preparing and manipulating complex quantum states. To date preparation and manipulation of quantum systems has primarily been done using adiabatic processes. These adiabatic processes while robust have …
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Study and Application of the Space Curve Quantum Control Formalism
Quantum Computation and Information requires high accuracy in gate control despite noises and imperfections from the environment and physical implementation. Here we introduce an SCQC Formalism based on dynamical decoupling and reverse engineering. Space Curve Quantum Control Formalism discovers …
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Quantum control of the electronic and thermal properties of Fullerenes and Exohedral Fullerenes
… on density functional theory, combined with quantum transport calculations using Greens functions. Fullerenes are promising building blocks for nano-scale electronics, as they have relatively large spherical surface area and are geometrically symmetric. If fullerenebased thermoelectricity is …
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Interactions of light with matter-- applications to single molecule spectroscopy and quantum control
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1998.
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Numerical Case Study of an Atom-Photon Interaction in a Cavity Exploring Quantum Control
… cavity mode (Jaynes-Cumming model) in a closed quantum system in resonance or near resonance for a time-dependent coupling coefficient g(t) in both the interaction and rotating picture by implementing a novel numerical method called MG4 and compare out results to the Runge-Kutta 4th (RK4) order …
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Development of a Wavelet -Based Algorithm and Fitness Function for Computational and Experimental Quantum Control of Intramolecular Vibration Redistribution
… only useful for computational modeling of the control process. A reliable time-resolved, but still averaged, quantity readily available from pump-probe experiments is the survival probability, P(t) = 0&vbm0;t 2 , of the wavepacket. In order to design an experimentally-viable scheme for …
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Non-Gaussian noise spectroscopy with superconducting qubits
Most quantum control and quantum error-correction protocols assume that the noise causing decoherence is described by Gaussian statistics. However, the Gaussianity assumption breaks down when the quantum system is strongly coupled to a sparse environment or has a non-linear response to external …
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Quantum assisted sensing, simulation and control
… aims of improving and advancing techniques of quantum metrology, simulation and control. Towards this goal, we engineer novel devices for quantum sensing, particularly the measurement of rotations, magnetic fields, and single spins towards the reconstruction of single-molecule structures. We …
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Developing the spin qubit of the tin-vacancy center in diamond for quantum networks
Quantum technologies working towards quantum computation and quantum communication have made tremendous progress over the past few years, highlighted by the 2019 "quantum supremacy" achievement demonstrating that quantum computers can realize calculations intractable to classical computers [5]. …
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