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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2204
DTSTART:20110818T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T120235Z
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. <br>
\n<br>
\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
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