Enhancement of the indistinguishability of single photon emitters coupled to photonic waveguides

Guimbao, J.; Weituschat, L. M.; Llorens, Jorge Cardona; Postigo, P. A.

doi:10.1364/oe.422023

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…The position of the QE inside the cavity plays a relevant role. 46 To explore the effect of the position of the QE in Γ p , we have performed 3D-FDTD simulations changing the position (y 0 ) of the QE along the cavity cross section (y-axis) at z 0 = 4 nm above the top of the cavity. Figure 3f shows Γ p versus y 0 varying from −225 to +225 nm when ω h = 200 nm, ω s = 30 nm, and #p = 10.…”

Section: ■ Results and Discussionmentioning

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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Section: ■ Results and Discussionmentioning

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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“…One such field that merited from this modeling approach is optics, where attractive applications in plasmonics, photonics, non-classical light sources, quantum dots, semiconductors, and so on can be realized [4,[6][7][8][9][10]. Notably from those applications, plasmonic nanostructures were studied extensively, which reveals unique optical properties such as the negative index of refraction, complex sub-wavelength characteristics, extraordinary transmission, tunable resonances, photocatalytic activity, and color printing [10][11][12][13][14][15]. In particular, exploiting interactions between light and matter with the help of surface plasmon resonance (SPR) results in variety of properties and functions.…”

Section: Introductionmentioning

confidence: 99%

An Accessible Integrated Nanoparticle in a Metallic Hole Structure for Efficient Plasmonic Applications

et al. 2022

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Addressing the severe deterioration of gap mode properties in spherical-shaped nanoparticles (NPs) becomes necessary due to their utilization in a wide range of multi-disciplinary applications. In this work, we report an integrated plasmonic nanostructure based on a spherical-shaped nanoparticle (NP) in a metallic hole as an alternative to a NP-only structure. With the help of three-dimensional (3D) electromagnetic simulations, we reveal that when a NP is positioned on the top of a metallic hole, it can exhibit superior gap-mode-based local-field intensity enhancement. The integrated nanostructure displayed a ~22-times increase in near-field enhancement characteristics, similar to cube- or disk-shaped nanostructure’s plasmonic properties. From an experimental perspective, the NP positioning on top of the metallic hole can be realized more easily, facilitating a simple fabrication meriting our design approach. In addition to the above advantages, a good geometrical tolerance (metallic hole-gap size error of ~20 nm) supported by gap mode characteristics enhances flexibility in fabrication. These combined advantages from an integrated plasmonic nanostructure can resolve spherical-shaped NP disadvantages as an individual nanostructure and enhance its utilization in multi-disciplinary applications.

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“…As a consequence, I is reduced to non-practical values for quantum information tasks: I > 0.79 for most quantum information processing schemes and I > 0.5 for QKD protocols [27]. In this regard, QDs for SPS operation are restricted to low T. In an attempt to overcome this limitation, a variety of cavity-engineering approaches have been conducted [28,29]. However, several theoretical works [30][31][32] indicate that cavity quality factors (Q) above 4 × 10 7 are required for QDs to function at room T, while, to date, the highest reported Q coupled to a quantum emitter is about Q = 55,000 [33].…”

Section: Introductionmentioning

confidence: 99%

Perfect Photon Indistinguishability from a Set of Dissipative Quantum Emitters

Sánchis

Weituschat

et al. 2022

Nanomaterials

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Single photon sources (SPS) based on semiconductor quantum dot (QD) platforms are restricted to low temperature (T) operation due to the presence of strong dephasing processes. Although the integration of QD in optical cavities provides an enhancement of its emission properties, the technical requirements for maintaining high indistinguishability (I) at high T are still beyond the state of the art. Recently, new theoretical approaches have shown promising results by implementing two-dipole-coupled-emitter systems. Here, we propose a platform based on an optimized five-dipole-coupled-emitter system coupled to a cavity which enables perfect I at high T. Within our scheme the realization of perfect I single photon emission with dissipative QDs is possible using well established photonic platforms. For the optimization procedure we have developed a novel machine-learning approach which provides a significant computational-time reduction for high demanding optimization algorithms. Our strategy opens up interesting possibilities for the optimization of different photonic structures for quantum information applications, such as the reduction of quantum decoherence in clusters of coupled two-level quantum systems.

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Enhancement of the indistinguishability of single photon emitters coupled to photonic waveguides

Cited by 4 publications

References 45 publications

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

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

An Accessible Integrated Nanoparticle in a Metallic Hole Structure for Efficient Plasmonic Applications

Perfect Photon Indistinguishability from a Set of Dissipative Quantum Emitters

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