Indistinguishable photons from deterministically integrated single quantum dots in heterogeneous GaAs/Si3N4 quantum photonic circuits

Schnauber, Peter; Singh, Anshuman; Schall, Johannes; Park, Suk In; Song, Jin Dong; Rodt, Sven; Srinivasan, Kartik; Reitzenstein, Stephan; Davanço, Marcelo

doi:10.1364/fio.2019.fm3d.5

Cited by 4 publications

(6 citation statements)

References 3 publications

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“…Regarding the relatively low single-photon coupling efficiency into the ULLWs demonstrated here, the main contributing factors include a sub-optimal nanophotonic design and quantum dot positioning and, principally, dipole moment orientation within the GaAs device. While various techniques have been developed to solve the latter issues 32,56 the implemented photonic design featured two factors that fundamentally lead to lower efficiencies. First, the choice of a waveguide geometry imposes a limit on the QD coupling to guided, as opposed to radiative, waves 25 .…”

Section: Discussionmentioning

confidence: 99%

“…The top cladding thickness is chosen to ensure a weakly confined single transverse-electric (TE) guided mode with low propagation losses in the 900 nm wavelength band 31 . The on-chip single-photon source consists of a straight GaAs nanowaveguide with embedded InAs self-assembled QDs followed by an adiabatic mode transformer, a geometry that has been shown to allow efficient coupling of QD emission directly into air-clad Si 3 N 4 ridge waveguides 25,32 . Opposite to the adiabatic taper, a one-dimensional photonic crystal back-reflector designed for high reflectivity above 900 nm is introduced to allow unidirectional emission into the Si 3 N 4 waveguide.…”

Section: Device Description and Fabricationmentioning

confidence: 99%

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Ultra-low loss quantum photonic circuits integrated with single quantum emitters

et al. 2022

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The scaling of many photonic quantum information processing systems is ultimately limited by the flux of quantum light throughout an integrated photonic circuit. Source brightness and waveguide loss set basic limits on the on-chip photon flux. While substantial progress has been made, separately, towards ultra-low loss chip-scale photonic circuits and high brightness single-photon sources, integration of these technologies has remained elusive. Here, we report the integration of a quantum emitter single-photon source with a wafer-scale, ultra-low loss silicon nitride photonic circuit. We demonstrate triggered and pure single-photon emission into a Si3N4 photonic circuit with ≈ 1 dB/m propagation loss at a wavelength of ≈ 930 nm. We also observe resonance fluorescence in the strong drive regime, showing promise towards coherent control of quantum emitters. These results are a step forward towards scaled chip-integrated photonic quantum information systems in which storing, time-demultiplexing or buffering of deterministically generated single-photons is critical.

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Section: Discussionmentioning

confidence: 99%

Section: Device Description and Fabricationmentioning

confidence: 99%

Ultra-low loss quantum photonic circuits integrated with single quantum emitters

et al. 2022

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“…To get information about the physical behavior of the device, we will set first λ = 801 nm to perform a general evaluation of the performance. After that, for each type of emitter, the geometrical parameters of the device (i.e., t, L, and Λ) are set to match the specific emission wavelength λ: (λ, t, L, Λ) = (915, 900, 263, 263 nm) for InGaAs, 26 (916, 900, 263, 263 nm) for GaAs, 27 (728, 710, 210, 210 nm) for TMDC, 28 (785, 770, 225, 225 nm) for S.molecules, 29 and (685, 680, 195, 195 nm) for diamond color centers. 30 Figure 1a shows how the slotted cross section of the cavity enhances the field of the zero-order TE mode in the gap showing an evanescent tail in the top of the waveguide.…”

Section: ■ Methodsmentioning

confidence: 99%

“…We vary the geometrical parameters of the waveguide cavity (i.e., the waveguide width, slot width, number of periods), and we obtain a theoretical estimation of the cavity performance for I, β, and the Purcell enhancement. We explore different types of promising SPS (InGaAs 26 and GaAs 27 quantum dots, single molecules, 28 localized excitons in transition metal dichalcogenides transition-metal dichalcogenide (TMDC) monolayers, 29 and diamond color centers 30 ), and we obtain theoretical near-unity I and high β simultaneously by parameter optimization. Finally, we develop a hybrid deep neural network-genetic algorithm (GA) scheme that further reduces the modal volume for achieving near-unity I with a slot width of 20 nm.…”

Section: ■ Introductionmentioning

confidence: 99%

Numerical Optimization of a Nanophotonic Cavity by Machine Learning for Near-Unity Photon Indistinguishability at Room Temperature

et al. 2022

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Room-temperature (RT), on-chip deterministic generation of indistinguishable photons coupled to photonic integrated circuits is key for quantum photonic applications. Nevertheless, high indistinguishability (I) at RT is difficult to obtain due to the intrinsic dephasing of most deterministic singlephoton sources (SPS). Here, we present a numerical demonstration of the design and optimization of a hybrid slot-Bragg nanophotonic cavity that achieves a theoretical near-unity I and a high coupling efficiency (β) at RT for a variety of single-photon emitters. Our numerical simulations predict modal volumes in the order of 10 −3 (λ/2n) 3 , allowing for strong coupling of quantum photonic emitters that can be heterogeneously integrated. We show that high I and β should be possible by fine-tuning the quality factor (Q) depending on the intrinsic properties of the single-photon emitter. Furthermore, we perform a machine learning optimization based on the combination of a deep neural network and a genetic algorithm (GA) to further decrease the modal volume by almost 3 times while relaxing the tight dimensions of the slot width required for strong coupling. The optimized device has a slot width of 20 nm. The design requires fabrication resolution in the limit of the current state-of-the-art technology. Also, the condition for high I and β requires a positioning accuracy of the quantum emitter at the nanometer level. Although the proposal is not a scalable technology, it can be suitable for experimental demonstration of single-photon operation.

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“…Heterostructured nanomaterials have attracted widespread attention in the past decades owing to their unique physical and chemical properties, as well as their potential uses in various fields including catalysis, 1−3 sensing, 4,5 photonics, 6 and biomedical imaging. 7,8 Heterostructures, whose chemical compositions change with positions, were intensively reported in semiconductor physics at first.…”

Section: ■ Introductionmentioning

confidence: 99%

Molecular Dynamics Investigation on Thermal Stability and Shape Evolution of Pd-Au Heterostructured Nanorods: Implications for Catalysis

Zhao

Huang

et al. 2021

ACS Appl. Nano Mater.

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Heterogeneous nanostructures have attracted tremendous interest because of their exceptional properties and promising applications in extensive fields. In this work, we employed molecular dynamics (MD) simulations to investigate thermally driven structural and shape evolutions of Pd-Au heterostructured nanorods consisting of hexagonal close-packed (hcp) Pd-core/Au-shell structures in the middle and face-centered cubic (fcc) Au terminated at both ends (referred to as fcc-2H-fcc Pd@Au nanorods). Our results reveal that these nanorods exhibit a two-stage melting mode, that is, melting initiates at both ends of the nanorods and extends to the middle with increasing temperature. Moreover, specific thermodynamic behaviors are associated with the core size. With the lowering core size, the difference in the melting points between the core and the shell in the nanorods decreases accordingly, and the two-stage melting characteristic tends to be obscure. During heating, these nanorods experience a significant shrinkage after the melting of Au at both ends, forming a liquid-like shell/solid-core structure prior to the overall melting. However, two-stage melting is absent in fcc-2H-fcc Au nanorods. These results extend the fundamental understanding of the thermal stability of metallic heterostructured nanorods and provide a theoretical reference for the design and application of one-dimensional metallic heterostructures.

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Indistinguishable photons from deterministically integrated single quantum dots in heterogeneous GaAs/Si3N4 quantum photonic circuits

Cited by 4 publications

References 3 publications

Ultra-low loss quantum photonic circuits integrated with single quantum emitters

Ultra-low loss quantum photonic circuits integrated with single quantum emitters

Numerical Optimization of a Nanophotonic Cavity by Machine Learning for Near-Unity Photon Indistinguishability at Room Temperature

Molecular Dynamics Investigation on Thermal Stability and Shape Evolution of Pd-Au Heterostructured Nanorods: Implications for Catalysis

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