Quantum-dot-induced phase shift in a pillar microcavity

Young, Andrew; Oulton, Ruth; Hu, C. Y.; Thijssen, Act; Schneider, Christian; Reitzenstein, Stephan; Kamp, M.; Hoefling, Sven; Worschech, L.; Forchel, A.; Rarity, John

doi:10.1103/physreva.84.011803

Cited by 86 publications

(87 citation statements)

References 27 publications

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“…We believe that our work paves the way towards a generation of QD-micropillar devices operated in the strong coupling regime relying on distinct polariton features, such as optically or electrically driven single QD lasers in the strong coupling regime [32] or deterministic sources of indistinguishable single photons generated via the adiabatic Raman passage [35]. Furthermore, we believe that the ultra-high quality factors in conjunction with strongly coupled QD emitters, which we demonstrate in this work, will play a key role in the development of deterministic spin-photon interfaces and quantum non demolition read out schemes, as predicted in [34] and experimentally indicated in [15]. …”

Section: Resultsmentioning

confidence: 91%

“…Both regimes have fundamental importance in the design of semiconductor devices with integrated quantum emitters (quantum dots) of the 'next generation' of photonic devices, such as efficient sources of single photons on demand [10][11][12], sources of entangled photon pairs [13], and sources of coherently generated and emitted single photons as demonstrated for atoms in optical cavities [14] . High-Q microcavities with embedded quantum dots also play a major role in the development of key building blocks for solid state quantum repeaters, in particular for developing spin photon interfaces [15,16]. This motivates the need of high quality microcavities.…”

Section: Introductionmentioning

confidence: 99%

“…They are widely utilized in state-of-the-art vertically emitting microcavity lasers [1], optical filters, spin-photon interfaces [2] and they might also be useful for increasing the efficiency of solar cells [3,4]. However, the very high quality factors that can be provided by DBR-based microcavity structures also explains their important role in fundamental semiconductor optics, in particular in the research field of lightmatter interaction in semiconductors [5].…”

Section: Introductionmentioning

confidence: 99%

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Quantum dot micropillar cavities with quality factors exceeding 250,000

et al. 2016

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Abstract:We report on the spectroscopic investigation of quantum dot -micropillar cavities with unprecedented quality factors. We observe a pronounced dependency of the quality factor on the measurement scheme, and find that significantly larger quality factors can be extracted in photoreflectance compared to photoluminescence measurements. While the photoluminescence spectra of the microcavity resonances feature a Lorentzian lineshape and Q-factors up to 184,000 (±10,000), the reflectance spectra have a Fano-shaped asymmetry and feature significantly higher Q-factors in excess of 250,000 resulting from a full saturation of the embedded emitters. The very high quality factors in our cavities promote strong light-matter coupling with visibilities exceeding 0.5 for a single QD coupled to the cavity mode.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum dot micropillar cavities with quality factors exceeding 250,000

et al. 2016

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“…QDs also provide a light-matter interface [11][12][13] and can in principle be scaled to large quantum networks [14]. Two-photon HOM interference experiments using photons from a single QD [5,15,17], as well as from independent sources [18,19], have not only demonstrated the potential of QDs as single-photon sources, but also revealed the level of dephasing arising from incoherent excitation.…”

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confidence: 99%

On-demand semiconductor single-photon source with near-unity indistinguishability

et al. 2013

Nature Nanotech

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Single photon sources based on semiconductor quantum dots offer distinct advantages for quantum information, including a scalable solid-state platform, ultrabrightness, and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state networks is a high level of efficiency and indistinguishability. Pulsed resonance fluorescence (RF) has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed RF single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3-ps laser pulses. The π-pulse excited RF photons have less than 0.3% background contributions and a vanishing two-photon emission probability. Non-postselective Hong-Ou-Mandel interference between two successively emitted photons is observed with a visibility of 0.97(2), comparable to trapped atoms and ions. Two single photons are further used to implement a high-fidelity quantum controlled-NOT gate.Single photons have been proposed as promising quantum bits (qubits) for quantum communication [1], linear optical quantum computing [2, 3] and as messengers in quantum networks [4]. These proposals primarily rely upon a high degree of indistinguishability between individual photons to obtain the Hong-Ou-Mandel (HOM) type interference [5] which is at the heart of photonic controlled logic gates and photon-interference-mediated quantum networking [1][2][3][4].Among different types of single-photon emitters [6, 7], quantum dots (QDs) are attractive solid-state devices since they can be embedded in high-quality nanostructure cavities and waveguides to generate ultra-bright sources of single and entangled photons [7][8][9][10]. QDs also provide a light-matter interface [11][12][13] and can in principle be scaled to large quantum networks [14]. Two-photon HOM interference experiments using photons from a single QD [5,15,17], as well as from independent sources [18,19], have not only demonstrated the potential of QDs as single-photon sources, but also revealed the level of dephasing arising from incoherent excitation. The method of incoherent pumping (via above band-gap or p-shell excitation) typically causes reduced photon coherence times due to homogeneous broadening of the excited state [5] and uncontrolled emission time jitter from the nonradiative high-level to s-shell relaxation [6], leading to a decrease of photon indistinguishability.To eliminate these dephasings, an increasing effort has been devoted to s-shell resonant optical excitation of QDs. The Mollow triplet spectra and photon correlations of the resonance fluorescence (RF) have been measured [1][2][3]21]. Under continuous-wave (CW) laser excitation, a high degree of indistinguishability for continuously generated RF photons has been demonstrated through post-selective HOM interference [25]. However, in the CW regime, as the emission time of the RF photons is uncontrolled, the HOM interference relies on th...

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“…The maximum phase shift observed for a free-space setup is still an order of magnitude below the values achieved with cavity quantum electrodynamics setups [5]- [7], but a phase shift close to the maximum possible value of 180 • has not been observed in either system. Dispersive interaction has also been studied for an atomic ensemble trapped in the evanescent field of a nano fibre [8].…”

Section: Introductionmentioning

confidence: 88%

The phase shift induced by a single atom in free space

Sondermann

Leuchs

2013

JEOS:RP

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In this article we theoretically study the phase shift a single atom imprints onto a coherent state light beam in free space. The calculations are performed in a semiclassical framework. The key parameters governing the interaction and thus the measurable phase shift are the solid angle from which the light is focused onto the atom and the overlap of the incident radiation with the atomic dipole radiation pattern. The analysis includes saturation effects and discusses the associated Kerr-type non-linearity of a single atom.

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Quantum-dot-induced phase shift in a pillar microcavity

Cited by 86 publications

References 27 publications

Quantum dot micropillar cavities with quality factors exceeding 250,000

Quantum dot micropillar cavities with quality factors exceeding 250,000

On-demand semiconductor single-photon source with near-unity indistinguishability

The phase shift induced by a single atom in free space

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