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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.


Related in: MedlinePlus

Characterization of the investigated quantum dot - micropillar system.(a) Sketch of the micropillar structure including the light coupling from the top facet. (b) Temperature-dependent photoluminescence spectral intensity under non-resonant excitation on a linear grey scale black (0) to white (maximum). The bare resonance energies of excitons and the cavity mode (white dotted lines and dashed line, respectively), and the coupled polariton energies (solid lines) obtained from a Lorentzian lineshape fit and modelling (see Supplementary Note 2) are overlayed to the data. The corresponding average detuning δ (see equation 1) is shown on the upper axis scale. (c) Coupled resonance linewidths (measured: symbols, modelling: lines). Colours and linestyles as in b.
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f1: Characterization of the investigated quantum dot - micropillar system.(a) Sketch of the micropillar structure including the light coupling from the top facet. (b) Temperature-dependent photoluminescence spectral intensity under non-resonant excitation on a linear grey scale black (0) to white (maximum). The bare resonance energies of excitons and the cavity mode (white dotted lines and dashed line, respectively), and the coupled polariton energies (solid lines) obtained from a Lorentzian lineshape fit and modelling (see Supplementary Note 2) are overlayed to the data. The corresponding average detuning δ (see equation 1) is shown on the upper axis scale. (c) Coupled resonance linewidths (measured: symbols, modelling: lines). Colours and linestyles as in b.

Mentions: In recent years, significant progress has been made in the realization of high-quality optical microresonators that enabled pioneering demonstrations of the strong5678 and quantum strong coupling regime910 in the solid state. Micropillar cavities (Fig. 1a) are a model system for the study of strong coupling in this field. They consist of self-assembled InGaAs quantum dots (QDs)–providing individual exciton states of high oscillator strength, located in the anti-node of the fundamental cavity mode (C). In these structures, a quantum of optical excitation coherently oscillates between the fermionic exciton and bosonic cavity photon state. The resulting eigenstates of mixed exciton and photon character form a Jaynes-Cummings ladder11, with increasing number of photons in the cavity mode, showing a Rabi splitting of the rungs proportional to the root of the photon number.


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)

Characterization of the investigated quantum dot - micropillar system.(a) Sketch of the micropillar structure including the light coupling from the top facet. (b) Temperature-dependent photoluminescence spectral intensity under non-resonant excitation on a linear grey scale black (0) to white (maximum). The bare resonance energies of excitons and the cavity mode (white dotted lines and dashed line, respectively), and the coupled polariton energies (solid lines) obtained from a Lorentzian lineshape fit and modelling (see Supplementary Note 2) are overlayed to the data. The corresponding average detuning δ (see equation 1) is shown on the upper axis scale. (c) Coupled resonance linewidths (measured: symbols, modelling: lines). Colours and linestyles as in b.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Characterization of the investigated quantum dot - micropillar system.(a) Sketch of the micropillar structure including the light coupling from the top facet. (b) Temperature-dependent photoluminescence spectral intensity under non-resonant excitation on a linear grey scale black (0) to white (maximum). The bare resonance energies of excitons and the cavity mode (white dotted lines and dashed line, respectively), and the coupled polariton energies (solid lines) obtained from a Lorentzian lineshape fit and modelling (see Supplementary Note 2) are overlayed to the data. The corresponding average detuning δ (see equation 1) is shown on the upper axis scale. (c) Coupled resonance linewidths (measured: symbols, modelling: lines). Colours and linestyles as in b.
Mentions: In recent years, significant progress has been made in the realization of high-quality optical microresonators that enabled pioneering demonstrations of the strong5678 and quantum strong coupling regime910 in the solid state. Micropillar cavities (Fig. 1a) are a model system for the study of strong coupling in this field. They consist of self-assembled InGaAs quantum dots (QDs)–providing individual exciton states of high oscillator strength, located in the anti-node of the fundamental cavity mode (C). In these structures, a quantum of optical excitation coherently oscillates between the fermionic exciton and bosonic cavity photon state. The resulting eigenstates of mixed exciton and photon character form a Jaynes-Cummings ladder11, with increasing number of photons in the cavity mode, showing a Rabi splitting of the rungs proportional to the root of the photon number.

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.


Related in: MedlinePlus