Demonstration and modeling of time-bin entangled photons from a quantum dot in a nanowire

Aumann, Philipp; Prilmüller, Maximilian; Kappe, Florian; Ostermann, Laurin; Dalacu, Dan; Poole, Philip J.; Ritsch, Helmut; Lechner, Wolfgang; Weihs, Gregor

doi:10.1063/5.0081874

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…In 2017, Jöns K. D. et al used self-organized grown nanowires collected ~200 kHz entangled photon pairs at the first lens under 80 MHz pulsed excitation, which was a 20 times enhancement as compared to a bare quantum dot without a photonic nanostructure, and the entanglement fidelity was 81.7% ± 0.2% [91]. In 2022, Aumann P et al have shown the coherent coupling of the ground to biexciton state of an InAsP QD embedded in an InP nanowire via an optimized two-photon resonant excitation scheme and generated time-bin entangled photons, yielding a fidelity of 90% with respect to the maximally entangled Bell state [92]. Microlenses are another commonly used structure for extracting entangled photon pairs.…”

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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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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“…Exciting the biexciton state is of particular interest since it can generate entangled photon pairs for various encoding schemes, e.g. polarization or time-bin [8,51,52], in addition to offering a simple method to generate multiplexed single photons, towards advanced quantum communication protocols. Our results pave the way for practical realization of spatio-spectrally multiplexed single photons and entangled photon pairs from the same source.…”

Section: Introductionmentioning

confidence: 99%

Collective excitation of spatio-spectrally distinct quantum dots enabled by chirped pulses

Kappe

Karli

et al. 2023

Mater. Quantum. Technol.

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Nanoscale bright sources that produce high-purity single photons and high-fidelity entangled photonpairs are the building blocks to realize high security quantum communication devices. To achieve highcommunication rates, it is desirable to have an ensemble of quantum emitters that can be collectivelyexcited, despite their spectral variability. In case of semiconductor quantum dots, Rabi rotations arethe most popular method for resonant excitation. However, these cannot assure a universal, highly ef-ficient excited state preparation, due to the sensitivity to excitation parameters. In contrast, AdiabaticRapid Passage (ARP), relying on chirped optical pulses, is immune to quantum dot spectral inhomo-geneity. Here, we show that the robustness of ARP holds true for the simultaneous excitation of thebiexciton states in multiple, spatially separated and spectrally different quantum dots. For positivechirps, we also find a regime where the influence of phonons relax the sensitivity to spectral detuningsand lower the needed excitation power. Being able to generate high-purity photons from spatiallymultiplexed quantum dot sources using the biexciton to ground state cascade is a big step towards theimplementation of high photon rate, entanglement-based quantum key distribution protocols.

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“…Quantum entanglement [1] is important because it plays a key role in a range of quantum devices, notably in induced coherence [2][3][4] based quantum imaging/QNI schemes [5][6][7][8][9][10][11][12]; and in the time domain is a subject of wide-ranging and active study [13][14][15][16][17]. However, the complicating effects of material dispersion in the entanglement-generating nonlinear medium, or during subsequent propagation, are typically not considered [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The surprising persistence of time-dependent quantum entanglement

et al. 2022

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The mismatch between elegant theoretical models and the detailed experimental reality is particularly pronounced in quantum nonlinear interferometry (QNI). In stark contrast to theory, experiments contain pump beams that start in impure states and that are depleted, quantum noise that affects – and drives – any otherwise gradual build up of the signal and idler ﬁelds, and nonlinear materials that are far from ideal and have a complicated time-dependent dispersive response. Notably, we would normally expect group velocity mismatches to destroy any possibility of measurable or visible entanglement, even though it remains intact – the mismatches change the relative timings of induced signal-idler entanglements, thus generating “which path” information. Using an approach based on the positive-P representation, which is ideally suited to such problems, we are able to keep detailed track of the time-domain entanglement crucial for QNI. This allows us to show that entanglement can be – and is – recoverable despite the obscuring effects of real-world complications; and that that recovery is attributable to an implicit time-averaging present in the detection process.

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Demonstration and modeling of time-bin entangled photons from a quantum dot in a nanowire

Cited by 9 publications

References 24 publications

Quantum Light Source Based on Semiconductor Quantum Dots: A Review

Quantum Light Source Based on Semiconductor Quantum Dots: A Review

Collective excitation of spatio-spectrally distinct quantum dots enabled by chirped pulses

The surprising persistence of time-dependent quantum entanglement

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