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Microcavity controlled coupling of excitonic qubits.

Albert F, Sivalertporn K, Kasprzak J, Strauß M, Schneider C, Höfling S, Kamp M, Forchel A, Reitzenstein S, Muljarov EA, Langbein W - Nat Commun (2013)

Bottom Line: This is enabled by two-dimensional spectroscopy of the sample's coherent response, a sensitive probe of the coherent coupling.The results are quantitatively understood in a rigorous description of the cavity-mediated coupling of the quantum dot excitons.This mechanism can be used, for instance in photonic crystal cavity networks, to enable a long-range, non-local coherent coupling.

View Article: PubMed Central - PubMed

Affiliation: Technische Physik, Physikalisches Institut, and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, Würzburg D-97074, Germany.

ABSTRACT
Controlled non-local energy and coherence transfer enables light harvesting in photosynthesis and non-local logical operations in quantum computing. This process is intuitively pictured by a pair of mechanical oscillators, coupled by a spring, allowing for a reversible exchange of excitation. On a microscopic level, the most relevant mechanism of coherent coupling of distant quantum bits--like trapped ions, superconducting qubits or excitons confined in semiconductor quantum dots--is coupling via the electromagnetic field. Here we demonstrate the controlled coherent coupling of spatially separated quantum dots via the photon mode of a solid state microresonator using the strong exciton-photon coupling regime. This is enabled by two-dimensional spectroscopy of the sample's coherent response, a sensitive probe of the coherent coupling. The results are quantitatively understood in a rigorous description of the cavity-mediated coupling of the quantum dot excitons. This mechanism can be used, for instance in photonic crystal cavity networks, to enable a long-range, non-local coherent coupling.

No MeSH data available.


Level scheme and relevant transitions.The level scheme of the Tavis-Cummings ladder of the three exciton-one cavity system, and transitions relevant for the coherent FWM response, for δ=−29 μeV. (a) Coherence created by the pulse arriving first (E1 for , E2 for ). (b) Transitions emitting FWM after the arrival of the second pulse.
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f2: Level scheme and relevant transitions.The level scheme of the Tavis-Cummings ladder of the three exciton-one cavity system, and transitions relevant for the coherent FWM response, for δ=−29 μeV. (a) Coherence created by the pulse arriving first (E1 for , E2 for ). (b) Transitions emitting FWM after the arrival of the second pulse.

Mentions: A triple exciton-cavity system has a level scheme as shown in Fig. 2, more complex than the previously studied single-exciton-cavity system10. It hosts four polaritonic transitions from the vacuum state. The polariton frequency tuning (solid lines in Fig. 1b) as well as the variation of polariton linewidths (solid lines in Fig. 1c) can be described by a coupled oscillator model with the X1-C, X2-C, X3-C coupling parameters eV, homogeneous broadenings eV and frequency distances eV, and eV. The parameters were obtained from a global fit of the coupled oscillator model to the detuning-dependent transition energies and broadenings determined by Lorentzian lineshape fitting of the μPL spectra in Fig. 1b as described in Supplementary Note 2. To describe the detuning in this Tavis-Cummings system with non-identical two-level systems, we introduce the average cavity detuning


Microcavity controlled coupling of excitonic qubits.

Albert F, Sivalertporn K, Kasprzak J, Strauß M, Schneider C, Höfling S, Kamp M, Forchel A, Reitzenstein S, Muljarov EA, Langbein W - Nat Commun (2013)

Level scheme and relevant transitions.The level scheme of the Tavis-Cummings ladder of the three exciton-one cavity system, and transitions relevant for the coherent FWM response, for δ=−29 μeV. (a) Coherence created by the pulse arriving first (E1 for , E2 for ). (b) Transitions emitting FWM after the arrival of the second pulse.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3644086&req=5

f2: Level scheme and relevant transitions.The level scheme of the Tavis-Cummings ladder of the three exciton-one cavity system, and transitions relevant for the coherent FWM response, for δ=−29 μeV. (a) Coherence created by the pulse arriving first (E1 for , E2 for ). (b) Transitions emitting FWM after the arrival of the second pulse.
Mentions: A triple exciton-cavity system has a level scheme as shown in Fig. 2, more complex than the previously studied single-exciton-cavity system10. It hosts four polaritonic transitions from the vacuum state. The polariton frequency tuning (solid lines in Fig. 1b) as well as the variation of polariton linewidths (solid lines in Fig. 1c) can be described by a coupled oscillator model with the X1-C, X2-C, X3-C coupling parameters eV, homogeneous broadenings eV and frequency distances eV, and eV. The parameters were obtained from a global fit of the coupled oscillator model to the detuning-dependent transition energies and broadenings determined by Lorentzian lineshape fitting of the μPL spectra in Fig. 1b as described in Supplementary Note 2. To describe the detuning in this Tavis-Cummings system with non-identical two-level systems, we introduce the average cavity detuning

Bottom Line: This is enabled by two-dimensional spectroscopy of the sample's coherent response, a sensitive probe of the coherent coupling.The results are quantitatively understood in a rigorous description of the cavity-mediated coupling of the quantum dot excitons.This mechanism can be used, for instance in photonic crystal cavity networks, to enable a long-range, non-local coherent coupling.

View Article: PubMed Central - PubMed

Affiliation: Technische Physik, Physikalisches Institut, and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, Würzburg D-97074, Germany.

ABSTRACT
Controlled non-local energy and coherence transfer enables light harvesting in photosynthesis and non-local logical operations in quantum computing. This process is intuitively pictured by a pair of mechanical oscillators, coupled by a spring, allowing for a reversible exchange of excitation. On a microscopic level, the most relevant mechanism of coherent coupling of distant quantum bits--like trapped ions, superconducting qubits or excitons confined in semiconductor quantum dots--is coupling via the electromagnetic field. Here we demonstrate the controlled coherent coupling of spatially separated quantum dots via the photon mode of a solid state microresonator using the strong exciton-photon coupling regime. This is enabled by two-dimensional spectroscopy of the sample's coherent response, a sensitive probe of the coherent coupling. The results are quantitatively understood in a rigorous description of the cavity-mediated coupling of the quantum dot excitons. This mechanism can be used, for instance in photonic crystal cavity networks, to enable a long-range, non-local coherent coupling.

No MeSH data available.