Violation of Bell's inequality with quantum-dot single-photon sources

González-Ruiz, Eva M.; Das, Sumanta K.; Lodahl, Peter; Sørensen, Anders S.

doi:10.48550/arxiv.2109.14712

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…[40] Moreover, our schemes could be used in combination with highly-efficient photonic integrated circuits to implement device-independent quantum key distribution protocols, where maintaining photon coherence after conversion is crucial to perform Bell-state measurements at a remote heralding station. [41,42] Finally, the QFC demonstrated here closes the gap between the single-photon source technology of InAs QDs in GaAs and the mature silicon-on-insulator photonic integrated circuit technology, [43][44][45] enabling the modular integration of quantum communication, computing, and simulation.…”

Section: Discussionmentioning

confidence: 67%

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

et al. 2022

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On‐demand single‐photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are critical assets toward the deployment of fiber‐based quantum networks. Indeed, single photons may serve as flying qubits, allowing communication of quantum information over long distances. Self‐assembled InAs quantum dots embedded in GaAs constitute an excellent nearly deterministic source of high‐quality single photons, but the vast majority of sources operate in the 900–950 nm wavelength range, precluding their adoption in a quantum network. A quantum frequency conversion scheme is presented here for converting single photons from quantum dots to the telecommunication C band, around 1550 nm, achieving 40.8% end‐to‐end efficiency, while maintaining both high purity and a high degree of indistinguishability during conversion with measured values of gfalse(2false)(0)=2.4%$g^{(2)}(0)=2.4\%$ and V(corr)=94.8%$V^{\mbox{(corr)}}=94.8\%$, respectively.

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Section: Discussionmentioning

confidence: 67%

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

et al. 2022

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“…The demonstrated low-noise QFC enables developing schemes for long-distance quantum communication and it offers the possibility to compensate for the inhomogeneous broadening of the QD emission wavelength, as demonstrated by several works [38,39] recently achieving up to (67±2)% two-photon indistinguishability [40]. Moreover, our schemes could be used in combination with highlyefficient photonic integrated circuits to implement deviceindependent quantum key distribution protocols, where maintaining photon coherence after conversion is crucial to perform Bell-state measurements at a remote heralding station [41,42]. Finally, the QFC demonstrated here closes the gap between the single-photon source technology of InAs QDs in GaAs and the mature silicon-oninsulator photonic integrated circuit technology [43][44][45], enabling the modular integration of quantum communication, computing, and simulation.…”

mentioning

confidence: 90%

A Pure and indistinguishable single-photon source at telecommunication wavelength

Lio¹,

Carlos²,

Zhou³

et al. 2022

Preprint

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On-demand single-photon sources emitting pure and indistinguishable photons at the telecommunication wavelength are a critical asset towards the deployment of fiber-based quantum networks. Indeed, single photons may serve as flying qubits, allowing communication of quantum information over long distances. Self-assembled InAs quantum dots embedded in GaAs constitute an excellent nearly deterministic source of high quality single photons, but the vast majority of sources operate in the 900-950 nm wavelength range, precluding their adoption in a quantum network. Here, we present a quantum frequency conversion scheme for converting single photons from quantum dots to the telecommunication C band, around 1550 nm, achieving 40.8% end-to-end efficiency, while maintaining both high purity and a high degree of indistinguishability during conversion with measured values of g (2) (0) = 2.4% and V (corr) = 94.8%, respectively.

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“…Here high purity and photon indistinguishability was successfully achieved together with the 'hands-free' operation of the device over 110 h. However, in these devices the internal single-photon efficiency (β ∼ 0.80) was intrinsically limited by the NW geometry. Therefore, building a deterministic source with near-unity efficiency, for applications such as device-independent quantum key distribution [19,20], requires developing a new scheme for in-plane resonant excitation.…”

Section: Introductionmentioning

confidence: 99%

In-plane resonant excitation of quantum dots in a dual-mode photonic-crystal waveguide with high β-factor

Zhou

Lodahl

Midolo

2022

Quantum Sci. Technol.

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A high-quality quantum dot (QD) single-photon source is a key resource for quantum information processing. Exciting a QD emitter resonantly can greatly suppress decoherence processes and lead to highly indistinguishable single-photon generation. It has, however, remained a challenge to implement strict resonant excitation in a stable and scalable way, without compromising any of the key specs of the source (efficiency, purity, and indistinguishability). In this work, we propose a novel dual-mode photonic-crystal waveguide that realizes direct in-plane resonant excitation of the embedded QDs. The device relies on a two-mode waveguide design, which allows exploiting one mode for excitation of the QD and the other mode for collecting the emitted single photons with high efficiency. By proper engineering of the photonic bandstructure, we propose a design with single-photon collection efficiency of β > 0.95 together with a single-photon impurity of ϵ < 5 × 10−3 over a broad spectral and spatial range. The device has a compact footprint of ∼ 50 μ m 2 and would enable stable and scalable excitation of multiple emitters for multi-photon quantum applications.

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Violation of Bell's inequality with quantum-dot single-photon sources

Cited by 3 publications

References 28 publications

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

A Pure and Indistinguishable Single‐Photon Source at Telecommunication Wavelength

A Pure and indistinguishable single-photon source at telecommunication wavelength

In-plane resonant excitation of quantum dots in a dual-mode photonic-crystal waveguide with high β-factor

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