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Publications (6)28.48 Total impact

  • P Fallahi, S T Yilmaz, A Imamoğlu
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    ABSTRACT: We measure the strength and the sign of hyperfine interaction of a heavy hole with nuclear spins in single self-assembled quantum dots. Our experiments utilize the locking of a quantum dot resonance to an incident laser frequency to generate nuclear spin polarization. By monitoring the resulting Overhauser shift of optical transitions that are split either by electron or exciton Zeeman energy with respect to the locked transition using resonance fluorescence, we find that the ratio of the heavy-hole and electron hyperfine interactions is -0.09 ± 0.02 in three quantum dots. Since hyperfine interactions constitute the principal decoherence source for spin qubits, we expect our results to be important for efforts aimed at using heavy-hole spins in quantum information processing.
    Physical Review Letters 12/2010; 105(25):257402. · 7.73 Impact Factor
  • Selman Tunc Yilmaz, P. Fallahi, A. Imamoglu
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    ABSTRACT: Using resonance fluorescence from a single-electron charged quantum dot with 0.1% collection efficiency, we realize a single spin-photon interface where the detection of a scattered photon projects the electron spin to a definite spin eigenstate.
    Frontiers in Optics; 10/2010
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    P Fallahi, S. T. Yilmaz, A. Imamoglu
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    ABSTRACT: We measure the strength and the sign of hyperfine interaction of a heavy-hole with nuclear spins in single self-assembled quantum dots. Our experiments utilize the locking of a quantum dot resonance to an incident laser frequency to generate nuclear spin polarization. By monitoring the resulting Overhauser shift of optical transitions that are split either by electron or exciton Zeeman energy with respect to the locked transition using resonance fluorescence, we find that the ratio of the heavy-hole and electron hyperfine interactions is -0.09 +/- 0.02 in two QDs. Since hyperfine interactions constitute the principal decoherence source for spin qubits, we expect our results to be important for efforts aimed at using heavy-hole spins in solid-state quantum information processing. The novel spectroscopic technique we develop also brings new insights to the nuclear-spin mediated locking mechanism in quantum dots.
    09/2010;
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    S T Yilmaz, P Fallahi, A Imamoğlu
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    ABSTRACT: Using background-free detection of spin-state-dependent resonance fluorescence from a single-electron charged quantum dot with an efficiency of 0.1%, we realize a classical single spin-photon interface where the detection of a scattered photon with 300 ps time resolution projects the quantum dot spin to a definite spin eigenstate with fidelity exceeding 99%. The bunching of resonantly scattered photons reveals information about electron spin dynamics. High-fidelity fast spin-state initialization heralded by a single photon enables the realization of quantum information processing tasks such as nondeterministic distant spin entanglement. Given that we could suppress the measurement backaction to well below the natural spin-flip rate, realization of a quantum nondemolition measurement of a single spin could be achieved by increasing the fluorescence collection efficiency by a factor exceeding 10 using a photonic nanostructure.
    Physical Review Letters 07/2010; 105(3):033601. · 7.73 Impact Factor
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    ABSTRACT: Through the utilization of index-matched GaAs immersion lens techniques, we demonstrate a record extinction (12%) of a far-field focused laser beam by a single InAs/GaAs quantum dot. This contrast level enables us to report for the first time resonant laser transmission spectroscopy on a single InAs/GaAs quantum dot without the need for phase-sensitive lock-in detection.
    Nano Letters 10/2007; 7(9):2892-6. · 13.03 Impact Factor
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    ABSTRACT: Using index-matched GaAs immersion lens techniques we demonstrate a record (12%) extinction of a far-field focused laser by a single InAs/GaAs quantum dot. This extinction level enables resonant laser transmission spectroscopy without lock-in detection.
    Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 01/2007;