Scalable Spin Qubit Circuits With Quantum Dots
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| Total Pages | : 13 |
| Release | : 2006 |
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Download Scalable Spin-Qubit Circuits with Quantum Dots Book in PDF, Epub and Kindle
Double and triple coupled quantum dots have been fabricated by planar and vertical technology to contain just a few electrons in each dot. Electron imaging by scanning probe microscopy with the capability of wavefunction mapping in quantum dots has been demonstrated. Gate voltage and magnetic field control of charge and spin states, as well as exchange coupling between electron spins and between electron and nuclear spins have been achieved. Coherent nuclear spin operations and square-root-of-swap operation between two electrons on a time scale inferior at 1 ns have been realized. Meanwhile exchange coupling in various dot configurations has been calculated by realistic simulations in good agreement with experiment. Spin relaxation and decoherence mechanisms in quantum dots have been identified and their time constants measured (by spin echo) in good agreement with theory. Single-shot read-out of electron spin by charge state correlation has been demonstrated to be very fast and robust to electrostatic noise even at finite temperature exceeding state splitting.
| Author | : Martin J. A. Schütz |
| Publisher | : Springer |
| Total Pages | : 214 |
| Release | : 2016-11-15 |
| Genre | : Computers |
| ISBN | : 3319485598 |
Download Quantum Dots for Quantum Information Processing: Controlling and Exploiting the Quantum Dot Environment Book in PDF, Epub and Kindle
This thesis offers a comprehensive introduction to surface acoustic waves in the quantum regime. It addresses two of the most significant technological challenges in developing a scalable quantum information processor based on spins in quantum dots: (i) decoherence of the electronic spin qubit due to the surrounding nuclear spin bath, and (ii) long-range spin-spin coupling between remote qubits. Electron spins confined in quantum dots (QDs) are among the leading contenders for implementing quantum information processing. To this end, the author pursues novel strategies that turn the unavoidable coupling to the solid-state environment (in particular, nuclear spins and phonons) into a valuable asset rather than a liability.
| Author | : Nicholas Andrew Wasley |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 139 |
| Release | : 2013-09-05 |
| Genre | : Technology & Engineering |
| ISBN | : 3319015141 |
Download Nano-photonics in III-V Semiconductors for Integrated Quantum Optical Circuits Book in PDF, Epub and Kindle
This thesis breaks new ground in the physics of photonic circuits for quantum optical applications. The photonic circuits are based either on ridge waveguides or photonic crystals, with embedded quantum dots providing the single qubit, quantum optical emitters. The highlight of the thesis is the first demonstration of a spin-photon interface using an all-waveguide geometry, a vital component of a quantum optical circuit, based on deterministic single photon emission from a single quantum dot. The work makes a further important contribution to the field by demonstrating the effects and limitations that inevitable disorder places on photon propagation in photonic crystal waveguides, a further key component of quantum optical circuits. Overall the thesis offers a number of highly novel contributions to the field; those on chip circuits may prove to be the only means of scaling up the highly promising quantum-dot-based quantum information technology.
| Author | : John O'Hara |
| Publisher | : |
| Total Pages | : |
| Release | : 2017 |
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Download Quantum Light with Quantum Dots in III-V Photonic Integrated Circuits Book in PDF, Epub and Kindle
| Author | : Peter Michler |
| Publisher | : Springer |
| Total Pages | : 457 |
| Release | : 2017-06-01 |
| Genre | : Science |
| ISBN | : 3319563785 |
Download Quantum Dots for Quantum Information Technologies Book in PDF, Epub and Kindle
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.
| Author | : Haifeng Qiao |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
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Download Quantum-state Transfer in Semiconductor Quantum-dot Spin Arrays Book in PDF, Epub and Kindle
"Due to their long coherence times and scalability, electron spins in gate-defined semiconductor quantum dots provide a promising platform for quantum computing and quantum information processing applications. Recent experimental works have shown remarkable results demonstrating the capability of single-qubit and two-qubit gates above 99% fidelity. In addition to long-lived qubits and high-fidelity gates, another crucial component of a scalable quantum computer is the connectivity between qubits, which enables quantum error-correction algorithms and more efficient quantum gates. In this dissertation, we aim to improve the connectivity between quantum-dot electron-spin qubits. We experimentally demonstrate various methods of transferring quantum information and improving the control of interactions between electron-spin qubits in a GaAs/AlGaAs quadruple-quantum-dot array. The results include concatenated SWAP gates, conditional teleportation, orthogonal and simultaneous control of the multispin couplings, interaction-enhanced spin swaps, and long-distance superexchange"--Page x.
| Author | : Henry O. Everitt |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 303 |
| Release | : 2007-04-03 |
| Genre | : Science |
| ISBN | : 0387277323 |
Download Experimental Aspects of Quantum Computing Book in PDF, Epub and Kindle
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.
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| Total Pages | : 76 |
| Release | : 2015 |
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Download Scaling Electron Spin Qubit Devices Implemented in GaAs Quantum Dots Book in PDF, Epub and Kindle
| Author | : Max Hays |
| Publisher | : Springer Nature |
| Total Pages | : 200 |
| Release | : 2022-01-01 |
| Genre | : Science |
| ISBN | : 303083879X |
Download Realizing an Andreev Spin Qubit Book in PDF, Epub and Kindle
The thesis gives the first experimental demonstration of a new quantum bit (“qubit”) that fuses two promising physical implementations for the storage and manipulation of quantum information – the electromagnetic modes of superconducting circuits, and the spins of electrons trapped in semiconductor quantum dots – and has the potential to inherit beneficial aspects of both. This new qubit consists of the spin of an individual superconducting quasiparticle trapped in a Josephson junction made from a semiconductor nanowire. Due to spin-orbit coupling in the nanowire, the supercurrent flowing through the nanowire depends on the quasiparticle spin state. This thesis shows how to harness this spin-dependent supercurrent to achieve both spin detection and coherent spin manipulation. This thesis also represents a significant advancement to our understanding and control of Andreev levels and thus of superconductivity. Andreev levels, microscopic fermionic modes that exist in all Josephson junctions, are the microscopic origin of the famous Josephson effect, and are also the parent states of Majorana modes in the nanowire junctions investigated in this thesis. The results in this thesis are therefore crucial for the development of Majorana-based topological information processing.
| Author | : Kaiyu Yang |
| Publisher | : Open Dissertation Press |
| Total Pages | : 86 |
| Release | : 2017-01-27 |
| Genre | : Science |
| ISBN | : 9781374711655 |
Download QUANTUM INFO PROCESSING W/QUAN Book in PDF, Epub and Kindle
This dissertation, "Quantum Information Processing With Quantum Dots and Josephson Junctions" by Kaiyu, Yang, 楊開宇, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled QUANTUM INFORMATION PROCESSING WITH QUANTUM DOTS AND JOSEPHSON JUNCTIONS submitted by Yang Kaiyu for the Degree of Master of Philosophy at The University of Hong Kong in August 2003 The requirements for large-scalable and fault-tolerant quantum information processing (QIP) are stringent. The hunt for a suitable physical arena and precise experimental techniques plays a crucial role in the physical realization of QIP. In this thesis, two well-known large-scalable solid-state-based systems, i.e. the quantum-dot and the Josephson-junction were studied. Two protocols were presented to construct a set of universal quantum gates, which are the basic elements of QIP. Both protocols were fault-tolerant at least partially due to the designed approach for quantum evolution and novel hardware structure.A large-scalable quantum computer model, with qubits represented by the sub- space subtended by the ground and the single exciton states on semiconductor quantum dots, was proposed. A mixed approach was adopted to realize a set of universal quantum gates, with a nonadiabatic geometric phase for single qubit gates and a dynamic phase for two-qubit gates. This scheme was expected to be partially fault-tolerant. Another scheme was also presented. To realize fault-tolerant quantum com- putation and successful quantum communication over a long range, Josephson- junctionsinthe chargeregimewerecombinedwithcavities. AneffectiveHamil- tonian describing arbitrary pair charge-qubits coupled through the cavity was proposed. It was found that nontrivial two-qubit gates might be achieved by this coupling mechanism. The capability to interconvert localized charge qubits and flying qubits in the proposed scheme implies that a quantum network could be constructed using this large-scalable, solid-state-based system. DOI: 10.5353/th_b2928583 Subjects: Josephson junctions Quantum computers Quantum dots
