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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2242
DTSTART:20111117T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T232057Z
LAST-MODIFIED:20111107T202455Z
LOCATION:5310 Chamberlin
SUMMARY:Resonant Passage of Spin States in a Triple Quantum Dot\, R. G
 . Herb Condensed Matter Seminar\, Xuedong Hu\, University of Buffalo
DESCRIPTION:Experimental and theoretical research on spin qubits in qu
 antum dots are progressing toward systems with multiple spins in multi
 ple dots. Among the many quantum information processing tasks that can
  be accomplished by such a multi-qubit system is the coherent transfer
  of quantum states on chip\, which is an essential capability of a pra
 ctical quantum computer. In this talk I will discuss our recent work o
 n the physics of adiabatic quantum teleportation in a triple dot syste
 m. In particular\, we show that a teleportation process over a three-s
 pin chain can be mapped exactly onto two parallel and coherent adiabat
 ic passages\, one for each spin orientation. When the time evolution i
 s not adiabatic\, we find that the fidelity of information transfer di
 splays a strong oscillatory behavior\, and it is possible to have high
  fidelity when the switching frequency of the qubit interactions is a 
 subharmonic of the characteristic energy splitting of the three-spin s
 ystem. This resonant operation of an adiabatic passage protocol of spi
 n states is both fast and robust\, and points to a new way to perform 
 other quantum gates. 
URL:https://www.physics.wisc.edu/events/?id=2242
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