Optically Controlled Quantum Dot Spins For Scaleable Quantum Computing
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Optically Controlled Quantum Dot Spins For Scaleable Quantum Computing
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Author :
language : en
Publisher:
Release Date : 2005
Optically Controlled Quantum Dot Spins For Scaleable Quantum Computing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The objective of this program has been to work towards development of spin based quantum dots for optically driven quantum information processing. Using a combination of ultrahigh resolution laser spectroscopy to study the physics of the dots and ultrafast laser technology to coherently control the spins, we made several advances. Our main achievements include working with a model system based on the exciton optical Bloch vector where we demonstrated the first solid state quantum logic device and made the first demonstration of quantum state tomography in a solid. We also were successful in taking the new quantum dot structures produced by our collaborator, Dan Gammon at NRL that contained one electron, and demonstrated optically induced and detected quantum spin coherence and coherent optical control of the spin state. Our high resolution measurements also provided a measurement of the spin relaxation rate. The funding level in this program was primarily to support one graduate student and purchase equipment. The remaining support for the work comes from ARO, NSA (formerly ARDA), AFOSR, NSF.
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Author : Марко Вовчок
language : en
Publisher:
Release Date : 1957
written by Марко Вовчок and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1957 with categories.
Spin Photon And Spin Spin Interactions With Quantum Dots And Wells For Quantum Information Processing
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Author : Peter Leonard McMahon
language : en
Publisher:
Release Date : 2014
Spin Photon And Spin Spin Interactions With Quantum Dots And Wells For Quantum Information Processing written by Peter Leonard McMahon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Quantum information technology holds much promise for the future, but efforts over the past two decades to implement quantum computers and quantum repeaters have been hampered by the extraordinarily difficult challenges one faces when attempting to engineer fault-tolerant, controllable large-scale quantum systems. In this thesis, I present several theoretical and experimental results that aim to advance the state-of-the-art in the design and realization of physical implementations of quantum bits that have the potential to scale to the large numbers of physical qubits that are required to implement most useful quantum information processing devices. In general, solid-state qubits offer the advantage over atomic or ionic systems that they have the potential to be scaled more easily than most atomic or ionic qubit implementations. However, atomic and ionic qubits generally tend to offer much higher operation fidelities due to their greater isolation from the environment. Our work on the generation and tomography of an entangled qubit pair consisting of an electron spin qubit in a quantum dot, and a photonic qubit emitted by the quantum dot, which is described in this thesis, shows that semiconductor spin-photon interfaces can produce states with surprisingly high fidelities, rivaling the fidelities measured in many atomic and ionic implementations. Two major outstanding challenges in the optical quantum dot spin qubit community are the implementation of high-fidelity, fast, single-shot qubit readout, and the implementation of a scalable two-qubit gate that can operate on nearest-neighbour qubits in a regular array. I present several pieces of work that are related to these two challenges. Specifically, I present two different theoretical proposals for implementing single-shot spin readout, and I present experimental work that demonstrates the underlying physical mechanism in the latter proposal. This mechanism is based on the coupling of a spin in a quantum well to a gas of exciton-polaritons, formed in a quantum well situated close to the quantum dot. Despite more than a decade having passed since the first proposal calling for the use of exchange coupling of spin qubits to delocalized excitons in order to implement two-qubit operations, there has been scant experimental progress in this direction. I present our demonstration that the class of device envisaged in the polariton-based proposals can be implemented, and that the exchange interaction between a quantum dot electron spin and an exciton-polariton's electron spin results in a measurable energy shift. This is a first step towards the realization of the polariton-exchange-interaction-based proposals, and provides some hope that these proposals may yet yield fruit.\\ One of the key features of recent proposals (for example, see references for developing a quantum computer or a quantum repeater using optically-controlled semiconductor spin qubits is the use of a regular array of site-controlled spins. However, despite the significant progress in implementing spin initialization, control, readout, and a spin-photon interface using randomly-positioned charged quantum dots, there has been relatively little work done on demonstrating all these key operations in site-controlled quantum dots. In the final vignette of this thesis, I present our work on attempting to optically pump a spin in a quantum dot that is inside a site-controlled nanowire. Recent efforts to improve the optical quality of site-controlled quantum dots realized using a variety of growth and fabrication techniques have seen considerable success, so the demonstration of spin qubit operations in site-controlled quantum dots is a line of research that will likely be possible in the near future.
Physical Realizations Of Quantum Computing
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Author : Mikio Nakahara
language : en
Publisher: World Scientific
Release Date : 2006
Physical Realizations Of Quantum Computing written by Mikio Nakahara and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Computers categories.
The contributors of this volume are working at the forefront of various realizations of quantum computers. They survey the recent developments in each realization, in the context of the DiVincenzo criteria, including nuclear magnetic resonance, Josephson junctions, quantum dots, and trapped ions. There are also some theoretical contributions which have relevance in the physical realizations of a quantum computer. This book fills the gap between elementary introductions to the subject and highly specialized research papers to allow beginning graduate students to understand the cutting-edge of research in the shortest possible time. Sample Chapter(s). Chapter 1: DiVincenzo Criteria and Beyond (537 KB). Contents: DiVincenzo Criteria and Beyond (M M Salomaa & M Nakahara); Single-Electron Charge and Spin Qubit in Semiconductor Quantum Dots (T Fujisawa); Superconducting Quantum Computing: Status and Prospects (F K Wilhelm & K Semba); Controlling Three Atomic Qubits (H Hnffer et al.); Liquid-State NMR Quantum Computer: Hamiltonian Formalism and Experiments (Y Kondo et al.); Optical Quantum Computation (K Nemoto & W J Munro). Readership: Graduates students and researchers in physics."
Optical Manipulation Of Quantum Dot Spin Qubits With Exciton Polariton Resonance
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Author : Shruti Puri
language : en
Publisher:
Release Date : 2014
Optical Manipulation Of Quantum Dot Spin Qubits With Exciton Polariton Resonance written by Shruti Puri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Experiments to manipulate a handful of quantum bits, based on a variety of underlying physical mechanisms, have been demonstrated. The ultimate goal is to build large systems consisting of billions of qubits and implement fast qubit operations with adequate accuracy, for solving problems that are intractable on classical computers (like factoring large numbers and quantum simulations). We develop and analyze a hardware platform for a scalable quantum computer based on semiconductor quantum dot (QD) electron spin qubits and their interaction with microcavity quantum well (QW) exciton-polaritons. This approach is based on the framework of previously proposed QuDOS architecture for surface code quantum computation. Despite the developments in techniques for implementing quantum non-demolition (QND) measurement and nearest-neighbor gates in QD spin systems, achieving the resource requirements for fault-tolerance still remains a challenge. In order to overcome this, our scheme relies on the indirect optical control of QD spins, resulting from the long-ranged Coulomb exchange interaction between the spin qubits and optically excited, spin-polarized, QW exciton-polaritons. The strength of this scheme is twofold. Firstly, by a careful design of the QW and QD it is possible to separate the optical eld from the QD manifold, thus preventing any unwanted backaction during a measurement event. Secondly, the bosonic nature of polaritons and their weak interaction with the solid-state environment allows the injection of numerous polaritons coherently in a single mode, increasing the nonlinearity in the qubit-polariton coupling, crucial for two-qubit operation. We develop schemes for implementing fast, high- delity, single qubit gate, two-qubit geometric phase gate and single-shot QND measurement. Furthermore, we investigate several issues critical for the robustness of the gate operations such as decoherence mechanisms, polariton-polariton interaction, phonon scattering etc.
Spins In Optically Active Quantum Dots
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Author : Oliver Gywat
language : en
Publisher: John Wiley & Sons
Release Date : 2010-02-01
Spins In Optically Active Quantum Dots written by Oliver Gywat and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-02-01 with Technology & Engineering categories.
Filling a gap in the literature, this up-to-date introduction to the field provides an overview of current experimental techniques, basic theoretical concepts, and sample fabrication methods. Following an introduction, this monograph deals with optically active quantum dots and their integration into electro-optical devices, before looking at the theory of quantum confined states and quantum dots interacting with the radiation field. Final chapters cover spin-spin interaction in quantum dots as well as spin and charge states, showing how to use single spins for break-through quantum computation. A conclusion and outlook round off the volume. The result is a primer providing the essential basic knowledge necessary for young researchers entering the field, as well as semiconductor and theoretical physicists, PhD students in physics and material sciences, electrical engineers and materials scientists.
Experimental Aspects Of Quantum Computing
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Author : Henry O. Everitt
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-04-03
Experimental Aspects Of Quantum Computing written by Henry O. Everitt and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-04-03 with Science categories.
Practical quantum computing still seems more than a decade away, and researchers have not even identified what the best physical implementation of a quantum bit will be. There is a real need in the scientific literature for a dialogue on the topic of lessons learned and looming roadblocks. This reprint from Quantum Information Processing is dedicated to the experimental aspects of quantum computing and includes articles that 1) highlight the lessons learned over the last 10 years, and 2) outline the challenges over the next 10 years. The special issue includes a series of invited articles that discuss the most promising physical implementations of quantum computing. The invited articles were to draw grand conclusions about the past and speculate about the future, not just report results from the present.
Quantum Dots For Quantum Information Technologies
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Author : Peter Michler
language : en
Publisher: Springer
Release Date : 2017-06-01
Quantum Dots For Quantum Information Technologies written by Peter Michler and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-01 with Science categories.
This book highlights the most recent developments in quantum dot spin physics and the generation of deterministic superior non-classical light states with quantum dots. In particular, it addresses single quantum dot spin manipulation, spin-photon entanglement and the generation of single-photon and entangled photon pair states with nearly ideal properties. The role of semiconductor microcavities, nanophotonic interfaces as well as quantum photonic integrated circuits is emphasized. The latest theoretical and experimental studies of phonon-dressed light matter interaction, single-dot lasing and resonance fluorescence in QD cavity systems are also provided. The book is written by the leading experts in the field.
Optical Generation And Control Of Quantum Coherence In Semiconductor Nanostructures
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Author : Gabriela Slavcheva
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-06-01
Optical Generation And Control Of Quantum Coherence In Semiconductor Nanostructures written by Gabriela Slavcheva and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-06-01 with Science categories.
The fundamental concept of quantum coherence plays a central role in quantum physics, cutting across disciplines of quantum optics, atomic and condensed matter physics. Quantum coherence represents a universal property of the quantum s- tems that applies both to light and matter thereby tying together materials and p- nomena. Moreover, the optical coherence can be transferred to the medium through the light-matter interactions. Since the early days of quantum mechanics there has been a desire to control dynamics of quantum systems. The generation and c- trol of quantum coherence in matter by optical means, in particular, represents a viable way to achieve this longstanding goal and semiconductor nanostructures are the most promising candidates for controllable quantum systems. Optical generation and control of coherent light-matter states in semiconductor quantum nanostructures is precisely the scope of the present book. Recently, there has been a great deal of interest in the subject of quantum coh- ence. We are currently witnessing parallel growth of activities in different physical systems that are all built around the central concept of manipulation of quantum coherence. The burgeoning activities in solid-state systems, and semiconductors in particular, have been strongly driven by the unprecedented control of coherence that previously has been demonstrated in quantum optics of atoms and molecules, and is now taking advantage of the remarkable advances in semiconductor fabrication technologies. A recent impetus to exploit the coherent quantum phenomena comes from the emergence of the quantum information paradigm.
Advanced Quantum Communications
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Author : Sandor Imre
language : en
Publisher: John Wiley & Sons
Release Date : 2012-11-27
Advanced Quantum Communications written by Sandor Imre and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-27 with Computers categories.
The book provides an overview of the most advanced quantum informational geometric techniques, which can help quantum communication theorists analyze quantum channels, such as security or additivity properties. Each section addresses an area of major research of quantum information theory and quantum communication networks. The authors present the fundamental theoretical results of quantum information theory, while also presenting the details of advanced quantum ccommunication protocols with clear mathematical and information theoretical background. This book bridges the gap between quantum physics, quantum information theory, and practical engineering.