Publikation: Weak measurement of quantum dot spin qubits
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2007
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Published
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Physical Review / B. 2007, 76, 155324. Available under: doi: 10.1103/PhysRevB.76.155324
Zusammenfassung
The theory of weak quantum measurements is developed for quantum dot spin qubits. Building on recent experiments, we propose a control cycle to prepare, manipulate, weakly measure, and perform quantum state tomography. This is accomplished using a combination of the physics of electron spin resonance, spin blockade, and Coulomb blockade, resulting in a charge transport process. We investigate the influence of the surrounding nuclear spin environment, and find a regime where this environment significantly simplifies the dynamics of the weak measurement process, making this theoretical proposal realistic with existing experimental technology. We further consider spin-echo refocusing to combat dephasing, as well as discuss a realization of quantum undemolition , whereby the effects of quantum state disturbance are undone.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
530 Physik
Schlagwörter
Coulomb blockade, Nuclear spin, Paramagnetic resonance, Quantum dots, Spin echo (EPR)
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JORDAN, Andrew N., Björn TRAUZETTEL, Guido BURKARD, 2007. Weak measurement of quantum dot spin qubits. In: Physical Review / B. 2007, 76, 155324. Available under: doi: 10.1103/PhysRevB.76.155324BibTex
@article{Jordan2007measu-5042,
year={2007},
doi={10.1103/PhysRevB.76.155324},
title={Weak measurement of quantum dot spin qubits},
volume={76},
journal={Physical Review / B},
author={Jordan, Andrew N. and Trauzettel, Björn and Burkard, Guido},
note={Article Number: 155324}
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<dcterms:abstract xml:lang="eng">The theory of weak quantum measurements is developed for quantum dot spin qubits. Building on recent experiments, we propose a control cycle to prepare, manipulate, weakly measure, and perform quantum state tomography. This is accomplished using a combination of the physics of electron spin resonance, spin blockade, and Coulomb blockade, resulting in a charge transport process. We investigate the influence of the surrounding nuclear spin environment, and find a regime where this environment significantly simplifies the dynamics of the weak measurement process, making this theoretical proposal realistic with existing experimental technology. We further consider spin-echo refocusing to combat dephasing, as well as discuss a realization of quantum undemolition , whereby the effects of quantum state disturbance are undone.</dcterms:abstract>
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