Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot

TY - JOUR

T1 - Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot

AU - Barthel, C.

AU - Kjærgaard, Morten

AU - Medford, Andrew James

AU - Marcus, Charles Masamed

AU - Hanson, M. P.

AU - Gossard, A.C.

PY - 2010/4/19

Y1 - 2010/4/19

N2 - Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb blockade regime. The sensor quantum dot is up to 30 times more sensitive than a comparable quantum point-contact sensor and yields three times greater signal to noise in rf single-shot measurements. Numerical modeling is qualitatively consistent with experiment and shows that the improved sensitivity of the sensor quantum dot results from reduced lifetime broadening and screening.

AB - Single-shot measurement of the charge arrangement and spin state of a double quantum dot are reported with measurement times down to 100 ns. Sensing uses radio-frequency reflectometry of a proximal quantum dot in the Coulomb blockade regime. The sensor quantum dot is up to 30 times more sensitive than a comparable quantum point-contact sensor and yields three times greater signal to noise in rf single-shot measurements. Numerical modeling is qualitatively consistent with experiment and shows that the improved sensitivity of the sensor quantum dot results from reduced lifetime broadening and screening.

U2 - 10.1103/PhysRevB.81.161308

DO - 10.1103/PhysRevB.81.161308

M3 - Journal article

SN - 2469-9950

VL - 81

SP - 161308

JO - Physical Review B

JF - Physical Review B

IS - 16

ER -