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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4503
DTSTART:20170420T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T042629Z
LAST-MODIFIED:20170413T170108Z
LOCATION:5310 Chamberlin
SUMMARY:Entangling approaches for capacitively coupled semiconductor s
 pin qubits\, R. G. Herb Condensed Matter Seminar\,  Vanita Srinivasa\,
  Sandia
DESCRIPTION:Many proposed realizations of quantum information processi
 ng rely on rapid and robust entanglement of coherent qubits over a wid
 e range of distances. While implementations based on electron spins in
  solids can take advantage of both the relative isolation of spin qubi
 ts from their environment and rapid control of the electron charge\, e
 ntangling mechanisms in these systems are often limited in range and r
 emain susceptible to charge-based decoherence. I will describe our the
 oretical approaches to addressing these challenges for spin qubits enc
 oded in multiple electrons within systems of coupled quantum dots. We 
 analyze a new regime for capacitive coupling of two-electron spin qubi
 ts that leads to high theoretical fidelities for entangling gates with
 in silicon-based implementations in the presence of charge noise and r
 elaxation. We also show that the three-electron resonant exchange qubi
 t provides both a protected operating point for rapid single-qubit man
 ipulation and an electric dipole moment that enables multiple approach
 es for long-range entangling gates via a superconducting microwave res
 onator. These methods are inspired by techniques from circuit quantum 
 electrodynamics\, Hartmann-Hahn double resonance in NMR\, and the Cira
 c-Zoller gate for trapped ions.
URL:https://www.physics.wisc.edu/events/?id=4503
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