On-demand generation of entangled photons in the telecom C-band

Zeuner, Katharina D.; Jöns, Klaus D.; Schweickert, Lucas; Hedlund, Carl Reuterskiöld; Lobato, Carlos Nuñez; Lettner, Thomas; Wang, Kai; Gyger, Samuel; Schöll, Eva; Steinhauer, Stephan; Hammar, Mattias; Zwiller, Valéry

doi:10.1117/12.2567202

Cited by 6 publications

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“…At least several approaches have been used, e.g., utilizing the strain-reducing layer [35][36][37][38], growing on a metamorphic buffer layer [34,39,40], multistacking of QDs [41], or growth on a seeding layer [42]. For GaAs-based QD structures, single-photon emission at the third telecommunication window has been demonstrated only using a special metamorphic buffer layer grown by Metalorganic chemical vapor deposition (MOCVD) [43], with reported emission of entangled photons [44] and emission of indistinguishable photons [45], also with the possibility of precise piezo-tuning [46] and generation of single-photons on demand [47]. However, the growth process of such QDs is very demanding and prone to technological complications, deteriorating the optical quality of the final material [48], which is probably the reason for still lacking results on high-quality and high-brightness photonic structures out of that material system at 1.55 µm [11,40].…”

Section: Introductionmentioning

confidence: 99%

InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window

et al. 2021

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We investigated emission properties of photonic structures with InAs/InGaAlAs/InP quantum dashes grown by molecular beam epitaxy on a distributed Bragg reflector. In high-spatial-resolution photoluminescence experiment, well-resolved sharp spectral lines are observed and single-photon emission is detected in the third telecommunication window characterized by very low multiphoton events probabilities. The photoluminescence spectra measured on simple photonic structures in the form of cylindrical mesas reveal significant intensity enhancement by a factor of 4 when compared to a planar sample. These results are supported by simulations of the electromagnetic field distribution, which show emission extraction efficiencies even above 18% for optimized designs. When combined with relatively simple and undemanding fabrication approach, it makes this kind of structures competitive with the existing solutions in that spectral range and prospective in the context of efficient and practical single-photon sources for fiber-based quantum networks applications.

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Section: Introductionmentioning

confidence: 99%

InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window

et al. 2021

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Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

Schimpf

Reindl

Basset

et al. 2021

Applied Physics Letters

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A bright source of telecom single photons based on quantum frequency conversion

Morrison

Rambach

Koong

et al. 2021

Applied Physics Letters

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On-demand indistinguishable single-photon sources are essential for quantum networking and communication. Semiconductor quantum dots are among the most promising candidates, but their typical emission wavelength renders them unsuitable for use in fiber networks. Here, we present quantum frequency conversion of near-infrared photons from a bright quantum dot to the telecommunication C-band, allowing integration with existing fiber architectures. We use a custom-built, tunable 2400 nm seed laser to convert single photons from 942 nm to 1550 nm in a difference-frequency generation process. We achieve an end-to-end conversion efficiency of ≃35%, demonstrate count rates approaching 1 MHz at 1550 nm with g(2)(0)=0.043(1), and achieve Hong-Ou-Mandel (HOM) visibilities of 60%. We expect this scheme to be preferable to quantum dot sources directly emitting at telecom wavelengths for fiber-based quantum networking.

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On-demand generation of entangled photons in the telecom C-band

Cited by 6 publications

References 0 publications

InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window

InP-Substrate-Based Quantum Dashes on a DBR as Single-Photon Emitters at the Third Telecommunication Window

Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

A bright source of telecom single photons based on quantum frequency conversion

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