2015/02/11 by Dohun Kim, Daniel R Ward, D. R. Ward +11 · 2 citations
Computer Science · Physics and Astronomy · #Bloch sphere #Charge qubit #Coherence (philosophical gambling strategy) #Flux qubit #Mechanical and Optical Resonators #Phase qubit #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum dot #Quantum gate #Qubit #Rabi cycle #cond-mat.mes-hall
paper · pdf · doi:10.1038/npjqi.2015.4
published as npj Quantum Information 1 15004 (2015) · 9 pages and 6 figures including supplementary information
arxiv created 2015/02/11 · openalex publication_date 2015/10/26 · arxiv updated 2015/10/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract We implement resonant single qubit operations on a semiconductor hybrid qubit hosted in a three-electron Si/SiGe double quantum dot structure. By resonantly modulating the double dot energy detuning and employing electron tunnelling-based readout, we achieve fast (>100 MHz) Rabi oscillations and purely electrical manipulations of the three-electron spin states. We demonstrate universal single qubit gates using a Ramsey pulse sequence as well as microwave phase control, the latter of which shows control of an arbitrary rotation axis on the X – Y plane of the Bloch sphere. Quantum process tomography yields π rotation gate fidelities higher than 93 (96)% around the X ( Z ) axis of the Bloch sphere. We further show that the implementation of dynamic decoupling sequences on the hybrid qubit enables coherence times longer than 150 ns.