Tunable entangled photon emitters based on cavity-enhanced GaAs quantum dots on micromachined piezoelectric substrates (Conference Presentation)

Rota, Michele B.; Krieger, Tobias M.; Buchinger, Quirin; Neuwirth, Julia; Manna, Santanu; Basset, Francesco Basso; Moczała-Dusanowska, Magdalena; Silva, Saimon Filipe . Covre da; Yuan, Xueyong; Pettinari, G.; Huber, Tobias B.; Höfling, Sven; Rastelli, Armando; Trotta, Rinaldo

doi:10.1117/12.2632999

Cited by 2 publications

(2 citation statements)

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“…The g (2) (0) values for X and XX photons of QD4, which have the shortest lifetimes of the measured structures, are g X (2) (0) = 0.029(2) and g XX (2) (0) = 0.009 (6), showing that the accelerated decay does not lead to re-excitation. 21,59 Measurements of the autocorrelation function for both X and XX photons on 4 different QDs after etch cycles 1, 3, and 5 show that the values at 0-time delay are not affected by the etching (see section "Autocorrelation Data" in the Supporting Information).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling

Krieger,

Weidinger,

Oberleitner

et al. 2024

ACS Photonics

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Solid-state quantum emitters embedded in circular Bragg resonators are attractive due to their ability to emit quantum light with high brightness and low multiphoton probability. As for any emitter-microcavity system, fabrication imperfections limit the spatial and spectral overlap of the emitter with the cavity mode, thus limiting their coupling strength. Here, we show that an initial spectral mismatch can be corrected after device fabrication by repeated wet chemical etching steps. We demonstrate an ∼16 nm wavelength tuning for optical modes in AlGaAs resonators on oxide, leading to a 4-fold Purcell enhancement of the emission of single embedded GaAs quantum dots. Numerical calculations reproduce the observations and suggest that the achievable performance of the resonator is only marginally affected in the explored tuning range. We expect the method to be applicable also to circular Bragg resonators based on other material platforms, thus increasing the device yield of cavity-enhanced solid-state quantum emitters.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling

Krieger,

Weidinger,

Oberleitner

et al. 2024

ACS Photonics

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show abstract

“…In the same year, Wang H. et al used a CBG-like structure (with a broadband high Purcell factor of up to 11.3) coupled with InAs QD to achieve generate entangled photon pairs with a state fidelity of 90% ± 1%, the pair generation rate of 59% ± 1%, the pair extraction efficiency of 62% ± 6%, and photon indistinguishability of 90% ± 1% simultaneously [96]. In 2022, Rota M. B. et al demonstrated for the first time the combination of a cavityenhanced QD entangled photons source and a strain-tuning device capable of tuning the emission energy and the fine structure splitting of the excitonic lines by embedding a single GaAs QD into a CBG cavity and integrated onto a micromachined multiaxial piezoelectric actuator allowing for strain tuning, as shown in Figure 9b [97]. They achieved the extraction efficiency of the emitted entangled photons to a factor of 77% ± 5%, reaching single photons measured count rates up to 4.1 × 10 6 s −1 and measured lifetimes down to (14 ± 1)ps for the |XX transition and (23 ± 1) ps for the |X transition, corresponding to Purcell factors up to 11.…”

Section: Artificial Microstructures Enhanced Entangled Photon Emissio...mentioning

confidence: 99%

Quantum Light Source Based on Semiconductor Quantum Dots: A Review

Liu

2023

Photonics

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Quantum light sources that generate single photons and entangled photons have important applications in the fields of secure quantum communication and linear optical quantum computing. Self-assembled semiconductor quantum dots, also known as “artificial atoms”, have discrete energy-level structures due to electronic confinement in all three spatial dimensions. It has the advantages of high stability, high brightness, deterministic, and tunable emission wavelength, and is easy to integrate into an optical microcavity with a high-quality factor, which can realize a high-performance quantum light source. In this paper, we first introduce the generation principles, properties, and applications of single-photon sources in the field of quantum information and then present implementations and development of quantum light sources in self-assembled semiconductor quantum dot materials. Finally, we conclude with an outlook on the future development of semiconductor quantum dot quantum light sources.

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Tunable entangled photon emitters based on cavity-enhanced GaAs quantum dots on micromachined piezoelectric substrates (Conference Presentation)

Cited by 2 publications

References 0 publications

Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling

Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling

Quantum Light Source Based on Semiconductor Quantum Dots: A Review

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