High emission rate from a Purcell-enhanced, triggered source of pure single photons in the telecom C-band

Nawrath, Cornelius; Joos, Raphael; Kolatschek, Sascha; Bauer, Stéphanie; Pruy, Pascal; Hornung, Florian; Fischer, Julius; Huang, Jian; Vijayan, Ponraj; Sittig, Robert F.; Jetter, Michael; Portalupi, Simone Luca; Michler, Peter

doi:10.48550/arxiv.2207.12898

Cited by 4 publications

(1 citation statement)

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“…Its security relies on transmission of its key materials via single photons. However, bright telecom-wavelength single photon sources have just emerged in laboratory [2] and still require cryogenic cooling and a complex optical setup that prohibits commercial applications. For practicality, QKD systems usually use robust and readily available lasers as the light source and mitigate the multi-photon security risk by randomly transmitting decoy pulses that differ just in average intensities from the signal pulses [3,4].…”

Section: Introductionmentioning

confidence: 99%

Suppression of patterning effect using IQ modulator for high-speed quantum key distribution systems

GAO

Yuan

2023

Opt. Lett.

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Quantum key distribution (QKD) is an attractive technology for distributing secret encryption keys between distant users. The decoy-state technique has drastically improved its practicality and performance, and has been widely adopted in commercial systems. However, conventional intensity modulators can introduce security side channels in high speed QKD systems because of their non-stationary working points for decoy-state generation. Here, we analyze the transfer function of an in-phase/quadrature (IQ) modulator and reveal its superiority for stable decoy-state generation, followed by an experimental demonstration. Thanks to their convenient two-level modulation and inherent high speed, IQ modulators are ideal for use in high-speed decoy-state QKD systems.

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Section: Introductionmentioning

confidence: 99%

Suppression of patterning effect using IQ modulator for high-speed quantum key distribution systems

GAO

Yuan

2023

Opt. Lett.

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Quantum dots for photonic quantum information technology

Heindel¹,

Kim²,

Gregersen³

et al. 2023

Adv. Opt. Photon.

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The generation, manipulation, storage, and detection of single photons play a central role in emerging photonic quantum information technology. Individual photons serve as flying qubits and transmit the relevant quantum information at high speed and with low losses, for example between individual nodes of quantum networks. Due to the laws of quantum mechanics, the associated quantum communication is fundamentally tap-proof, which explains the enormous interest in this modern information technology. On the other hand, stationary qubits or photonic states in quantum computers can potentially lead to enormous increases in performance through parallel data processing, to outperform classical computers in specific tasks when quantum advantage is achieved. In this review, we discuss in depth the great potential of semiconductor quantum dots in photonic quantum information technology. In this context, quantum dots form a key resource for the implementation of quantum communication networks and photonic quantum computers, because they can generate single photons on demand. Moreover, these solid-state quantum emitters are compatible with the mature semiconductor technology, so that they can be integrated comparatively easily into nanophotonic structures such as resonators and waveguide systems, which form the basis for quantum light sources and integrated photonic quantum circuits. After a thematic introduction, we present modern numerical methods and theoretical approaches to device design and the physical description of quantum dot devices. We then introduce modern methods and technical solutions for the epitaxial growth and for the deterministic nanoprocessing of quantum devices based on semiconductor quantum dots. Furthermore, we highlight the most promising device concepts for quantum light sources and photonic quantum circuits that include single quantum dots as active elements and discuss applications of these novel devices in photonic quantum information technology. We close with an overview of open issues and an outlook on future developments.

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High-performance designs for fiber-pigtailed quantum-light sources based on quantum dots in electrically-controlled circular Bragg gratings

Rickert¹,

Betz

Plock

et al. 2023

Opt. Express

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We present a numerical investigation of directly fiber-coupled hybrid circular Bragg gratings (CBGs) featuring electrical control for operation in the application relevant wavelength regimes around 930 nm as well as the telecom O- and C-band. We use a surrogate model combined with a Bayesian optimization approach to perform numerical optimization of the device performance which takes into account robustness with respect to fabrication tolerances. The proposed high-performance designs combine hybrid CBGs with a dielectric planarization and a transparent contact material, enabling > 86% direct fiber coupling efficiency (> 93% efficiency into NA 0.8) while exhibiting Purcell factors > 20. Especially the proposed designs for the telecom range prove robust and can sustain expected fiber efficiencies of more than (82.2±4.1)−5.5+2.2% and expected average Purcell factors of up to (23.2±2.3)−3.0+3.2 assuming conservative fabrication accuracies. The wavelength of maximum Purcell enhancement proves to be the most affected performance parameter by the deviations. Finally, we show that electrical field strengths suitable for Stark-tuning of an embedded quantum dot can be reached in the identified designs. Our work provides blueprints for high-performance quantum light sources based on fiber-pigtailed and electrically-controlled quantum dot CBG devices for quantum information applications.

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High emission rate from a Purcell-enhanced, triggered source of pure single photons in the telecom C-band

Cited by 4 publications

References 0 publications

Suppression of patterning effect using IQ modulator for high-speed quantum key distribution systems

Suppression of patterning effect using IQ modulator for high-speed quantum key distribution systems

Quantum dots for photonic quantum information technology

High-performance designs for fiber-pigtailed quantum-light sources based on quantum dots in electrically-controlled circular Bragg gratings

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