Open Access(Invited) Single-Shot Readout of Singlet-Triplet Qubit States in a Si/SiGe Double Quantum Dot
Author(s) -
J. R. Prance,
Zhan Shi,
Christie Simmons,
D. E. Savage,
M. G. Lagally,
Lars R. Schreiber,
L. M. K. Vandersypen,
Mark Friesen,
Robert Joynt,
S. N. Coppersmith,
M. A. Eriksson
Publication year - 2013
Publication title -
ecs transactions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.235
H-Index - 52
eISSN - 1938-6737
pISSN - 1938-5862
DOI - 10.1149/05009.0655ecst
Subject(s) - singlet state , physics , qubit , quantum dot , quantum point contact , spin (aerodynamics) , triplet state , magnetic field , single shot , condensed matter physics , spin states , electron , atomic physics , quantum , quantum mechanics , quantum well , excited state , optics , laser , thermodynamics
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 singleshot 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 Ttriplet lifetime increases with magnetic field, reaching ~3s at 1T
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