BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2204
DTSTART:20110818T150000Z
DURATION:PT1H0M0S
DTSTAMP:20240319T070019Z
LAST-MODIFIED:20110816T181646Z
LOCATION:5310 Chamberlin
SUMMARY:Spins in GaAs: 2 dots - 2 qubits\, R. G. Herb Condensed Matter
Seminar\, Dr. Lars Schreiber\, Kavli Institute of Nanoscience\, TU De
lft\, The Netherlands
DESCRIPTION:Electron spins in electrostatically defined quantum dots a
re promising for defining qubits. As suggested in the proposal by Loss
and DiVincenzo\, we define one qubit per electron spin. Applying micr
owaves (10 GHz) to one of the top gates\, we observe photon-assisted t
unneling (PAT) across a GaAs double dot. PAT is considered to be a spi
n conserving process. Surprisingly\, we observe magnetic field depende
nt (PAT) resonances indicating a change of the two-electron spin state
during tunneling. Changing the external magnetic field and the double
-dot detuning\, we spectroscopically image the energy of the two-elect
ron spin states.
\n
\nIn addition\, for the first time\, we p
erformed single-shot read-out of two (solid-state) spins in a double d
ot. Detection is done by energy-dependent tunneling of the two electro
ns to the adjacent electron reservoirs. This method allows us to measu
re the (anti-)correlations of a spin singlet state and to characterize
the swap gate fidelity.
URL:https://www.physics.wisc.edu/events/?id=2204
END:VEVENT
END:VCALENDAR