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Conditional Dynamics of Interacting Quantum Dots

Conditional Dynamics of Interacting Quantum Dots. Science 320 , 772 (2008). Lucio Robledo, Jeroen Elzerman, Gregor Jundt, Mete Atatüre, Alexander Högele, Stefan Fält, Atac Imamoglu. ETH Dez. 2008 Georg Kucsko. Abstract. Two vertically coupled Quantum Dots (1 single-charged, 1 neutral)

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Conditional Dynamics of Interacting Quantum Dots

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  1. Conditional Dynamics of Interacting Quantum Dots Science 320, 772 (2008) Lucio Robledo, Jeroen Elzerman, Gregor Jundt, Mete Atatüre, Alexander Högele, Stefan Fält, Atac Imamoglu ETH Dez. 2008 Georg Kucsko

  2. Abstract • Two vertically coupled Quantum Dots (1 single-charged, 1 neutral) • Transition probability controlled by excitation in neighboring QD • Interaction mediated by tunnel coupling • Gated by laser field Motivation -> realization of optical controlled phase gate between two solid state qubits

  3. hole exchange splitting into X and X ‘red‘ QD 0 r,y 0 r,x mixing of resonant States -> shift smaller, ‘blue‘ QD Theory n charge carriers QD Exciton X -> shift in reds excitation energy -> conditional

  4. charge change in red QD linear stark shift anticrossing with interdot and intradot Experimental implementation Photoluminescence (PL) measurement -> tunnel coupling

  5. linear -> no tunnel coupling in X - b absorption of X polarized lasers 0 r B and C with X laser present - b Differnetial transmission

  6. conditional shift in red if blue laser in resonance density matrix approach gate voltage at 130 mV

  7. Advantages • Large shift in energy • Tuning through gate voltage • Gating in sub-picosecond timescales

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