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Coupled Quantum Dots Brittany Mcclinton EE C235 Nanofabrication 3/17/08

Asymmetric quantum dots are coupled through an applied electric field. Coupled Quantum Dots Brittany Mcclinton EE C235 Nanofabrication 3/17/08. E. A. Stinaff et al, Science 311 , 636 (2006). Why CQDs? Coupling With Applied Field Fabrication Coupling Mechanism Scaling Up. 1. 2. 3.

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Coupled Quantum Dots Brittany Mcclinton EE C235 Nanofabrication 3/17/08

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  1. Asymmetric quantum dots are coupled through an applied electric field Coupled Quantum DotsBrittany McclintonEE C235 Nanofabrication 3/17/08 E. A. Stinaff et al, Science311, 636 (2006).

  2. Why CQDs? Coupling With Applied Field Fabrication Coupling Mechanism Scaling Up

  3. 1 2 3 1 Scalable qubits Each dot represents a qubit 2 Long-lived Spin of unpaired electron or hole 3 Ultra-fast Optically excited states as auxiliary levels (laser pulses) Why CQDs? WHY NOT SQDs?

  4. Asymmetric pair of InAs Quantum Dots Exciton Notation: Indirect Resonance Direct Coupling = Resonance = AnticrossingCondition: Optical Excitation, Tunneling, Indirect Transitions Possible Coupling with an Applied Field

  5. Bottom Layer InAs QDs GaAs Tunneling Barrier Top Layer InAs QDs Asymmetric QDs by Design Fabrication

  6. Model Without Tunneling & Spin 1 2 3 Coupling mechanism Model With Tunneling & Spin Experimental Spectrum Resonance At

  7. Scaling up

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