Bright single photon source based on self-aligned quantum dot–cavity systems

Maier, Sebastian; Gold, Peter Werner; Forchel, A.; Gregersen, Niels; Mørk, Jesper; Höfling, Sven; Schneider, Christian; Kamp, M.

doi:10.1364/oe.22.008136

Cited by 51 publications

(52 citation statements)

References 22 publications

(23 reference statements)

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“…Quantum dots (QDs) have unparalleled brightness as single-photon sources and can be embedded in a variety of semiconductor devices and microcavity structures [1,2]. Until recently, the qualities of the photons generated from quantum dots have lagged behind other sources such as trapped atoms and ions, which enable the creation of photons with high indistinguishabilities and controllable temporal profiles via stimulated Raman transitions [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Controllable Photonic Time-Bin Qubits from a Quantum Dot

et al. 2018

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Photonic time-bin qubits are well suited to transmission via optical fibers and waveguide circuits. The states take the form 1 ffiffiffiffi ffi ð2Þ p ðαj0i þ e iϕ βj1iÞ, with j0i and j1i referring to the early and late time bin, respectively. By controlling the phase of a laser driving a spin-flip Raman transition in a single-holecharged InAs quantum dot, we demonstrate complete control over the phase, ϕ. We show that this photon generation process can be performed deterministically, with only a moderate loss in coherence. Finally, we encode different qubits in different energies of the Raman scattered light, paving the way for wavelengthdivision multiplexing at the single-photon level.

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Section: Introductionmentioning

confidence: 99%

Controllable Photonic Time-Bin Qubits from a Quantum Dot

et al. 2018

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“…This longstanding issue has recently been solved by exploiting photonic nanostructures to enhance non-linear responses. Employing low-Q planar microcavities [18,19], conical photonic waveguide antennas [20] and deterministic micro-lenses [21] the detection sensitivity of FWM generated by an exciton is improved by up to four orders of magnitude with respect to QDs in bulk material.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy

Mermillod¹,

Wigger²,

Delmonte³

et al. 2016

Optica

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A detailed understanding of the population and coherence dynamics in optically driven individual emitters in solids and their signatures in ultrafast nonlinear-optical signals is of prime importance for their applications in future quantum and optical technologies. In a combined experimental and theoretical study on exciton complexes in single semiconductor quantum dots we reveal a detailed picture of the dynamics employing three-beam polarization-resolved fourwave mixing (FWM) micro-spectroscopy. The oscillatory dynamics of the FWM signals in the exciton-biexciton system is governed by the fine-structure splitting and the biexciton binding energy in an excellent quantitative agreement between measurement and analytical description. The analysis of the excitation conditions exhibits a dependence of the dynamics on the specific choice of polarization configuration, pulse areas and temporal ordering of driving fields. The interplay between the transitions in the four-level exciton system leads to rich evolution of coherence and population. Using two-dimensional FWM spectroscopy we elucidate the excitonbiexciton coupling and identify neutral and charged exciton complexes in a single quantum dot. Our investigations thus clearly reveal that FWM spectroscopy is a powerful tool to characterize spectral and dynamical properties of single quantum structures.

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“…The DBR structure consists of 18.5 (5) bottom (top) AlAs/GaAs mirror pairs. A modulation doped low density In(Ga)As QD layer (1.8x10 9 cm −2 ) has been grown in the middle of the cavity [15]. The QDs have been grown spectrally close to the cavity mode resonance at ∼ 1388.6meV .…”

Section: Methodsmentioning

confidence: 99%

Efficient deterministic giant photon phase shift from a single charged quantum dot

Androvitsaneas¹,

Young²,

Lennon³

et al. 2017

Conference on Lasers and Electro-Optics

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Solid-state quantum emitters have long been recognised as the ideal platform to realize integrated quantum photonic technologies. We use a self-assembled negatively charged QD in a low Q-factor photonic micropillar to demonstrate for the first time a key figure of merit for deterministic switching and spin-photon entanglement: a shift in phase of an input single photon of > 90o with values of up to 2π/3 (120 o ) demonstrated. This > π/2 (90 o ) measured value represents an important threshold: above this value input photons interact with the emitter deterministically. A deterministic photon-emitter interaction is the only viable scalable means to achieve several vital functionalities not possible in linear optics such as quantum switches and entanglement gates. Our experimentally determined value is limited by mode mismatch between the input laser and the cavity, QD spectral fluctuations and spin relaxation. We determine that up to 80% of the collected photons have interacted with the QD and undergone a phase shift of π.The dramatic progress made in quantum dots (QD) has led to single photon sources with record efficiency and indistinguishability [1][2][3][4].However, QDs are not just exploited as sources; by maximising the interaction of the QD with light, one may use the QD transition to deterministically "switch" the phase, φ, of a single photon by up to π. Here we present the first solid-state implementation that achieves this key figure of merit. Using a low quality factor (Q-factor) micropillar in the "bad-cavity" limit we measure a phase shift of at least 2π/3 (120 • ). Accounting for background (20%), this corresponds to a π phase shift of all the photons reflected from the QD-cavity system. By combining this with the selection rules for QD spin transitions, one may unlock the ability to perform efficient, high fidelity quantum entanglement operations [5][6][7][8][9].There are two overarching requirements for designing a practical quantum photonic switch: firstly the passive photonic structure must possess well-defined and input and output modes facilitating efficient optical coupling. Secondly the quantum emitter should show perfect interaction (i.e. π phase shift for every interacting photon) and minimal photon scattering into leaky modes (γ) rather than the input/output mode (Γ), i.e. a high β-factor (β = Γ Γ+γ ). Such conditions have been satisfied using atom-cavity systems [10][11][12][13], but this has so far remained elusive for solid state quantum emitters, a more natural platform for integrable/scalable devices. In this manuscript we present a novel approach using a low Q-factor micropillar cavity often termed the "bad cavity" limit [14]. By doing this we ensure a well-defined, efficient input and output mode [15], in contrast to more traditional approaches using high Qfactor cavities [16,17] where limits in current fabrication tolerances lead to scattering into parasitic modes, limiting the phase shift to the order of ∼ π/10 [18-20]. Recent demonstrations have exploited a similar small photon p...

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Bright single photon source based on self-aligned quantum dot–cavity systems

Cited by 51 publications

References 22 publications

Controllable Photonic Time-Bin Qubits from a Quantum Dot

Controllable Photonic Time-Bin Qubits from a Quantum Dot

Dynamics of excitons in individual InAs quantum dots revealed in four-wave mixing spectroscopy

Efficient deterministic giant photon phase shift from a single charged quantum dot

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