(Invited) Single-Shot Readout of Singlet-Triplet Qubit States in a Si/SiGe Double Quantum Dot

The spin singlet and triplet states of a two-electron double quantum dot can be used to form a logical qubit that combines fast manipulation and a spin readout mechanism. We demonstrate single-shot readout of the two-electron states of a Si/SiGe double quantum dot using a quantum-point-contact charg...

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Published inECS transactions Vol. 50; no. 9; pp. 655 - 662
Main Authors Prance, Jon R., Shi, Zhan, Simmons, Christie B., Savage, Don E., Lagally, Max G., Schreiber, Lars R., Vandersypen, Lieven M.K., Friesen, Mark, Joynt, Robert, Coppersmith, Susan N., Eriksson, Mark A.
Format Journal Article
LanguageEnglish
Published 15.03.2013
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Summary:The spin singlet and triplet states of a two-electron double quantum dot can be used to form a logical qubit that combines fast manipulation and a spin readout mechanism. We demonstrate single-shot readout of the two-electron states of a Si/SiGe double quantum dot using a quantum-point-contact charge sensor and spin-to-charge conversion. From the statistics of multiple single-shot measurements, we find the lifetimes of the spin states as a function of in-plane magnetic field. The lifetimes of the singlet and T0 triplet are both ~10ms and insensitive to magnetic field. The T- triplet lifetime increases with magnetic field, reaching ~3s at 1T.
ISSN:1938-5862
1938-6737
DOI:10.1149/05009.0655ecst