Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots

Bauch, David; Heinze, Dirk; Förstner, Jens; Jöns, Klaus D.; Schumacher, Stefan

doi:10.1103/physrevb.104.085308

Cited by 10 publications

(20 citation statements)

References 40 publications

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“…We also note that pumping schemes that achieve efficient population of the multiply excited state must be designed with care, where the optimal pumping scheme can be unique to emitter type. There are, for instance, a multitude of pumping schemes for biexcitons in semiconductor quantum dots [46][47][48][49][50][51]. We seek to calculate the quality, specifically the efficiency η and fidelity F, of the emitted photons via cascade decay from multiply excited states of cascade emitters.…”

Section: Discussionmentioning

confidence: 99%

Entangled photons from composite cascade emitters

Wang,

Anali,

Yelin

2021

Preprint

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Entangled photons are crucial for quantum technologies, but generating arbitrary entangled photon states deterministically, efficiently, and with high fidelity remains a challenge. Here, we demonstrate how hybridization and dipole-dipole interactions-potentially simultaneously available in colloidal quantum dots and molecular aggregates-leveraged in conjunction can couple simple, well understood emitters into composite emitters with flexible control over the level structure. We show that cascade decay through carefully designed level structures can result in emission of frequencyentangled photons with Bell states and three-photon GHZ states as example cases. These results pave the way toward rational design of quantum optical emitters of arbitrarily entangled photons.

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Section: Discussionmentioning

confidence: 99%

Entangled photons from composite cascade emitters

Wang,

Anali,

Yelin

2021

Preprint

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“…If not stated otherwise, the cavity energy E cavity is set equal to the biexciton-exciton transition energy such that E cavity = E XX − E X , which is equivalent to an emission wavelength of 1550 nm. [22] It was previously shown in a simplified model, that the visibility of the emitted photons is increased by decreasing the biexciton lifetime. Respectively, the visibility is decreased when the lifetime ratio increases.…”

Section: Emitter Structurementioning

confidence: 97%

“…Here, not only the excitation laser but also the cavity is strongly off-resonant to the QD transitions. [22] In order to keep the excitation process simple, here we use a Gaussian shaped pulse to directly generate biexciton population via the two-photon Rabi-flop absorption process. Varying the pulse length from 𝜏 ∈ [1ps, 10ps], the emission process yields high-quality photons throughout the investigated range of 6.…”

Section: Quantum Simulationmentioning

confidence: 99%

On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs

Bauch,

Siebert,

Jöns

et al. 2023

Adv Quantum Tech

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The biexciton‐exciton emission cascade commonly used in quantum‐dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work, it focuses on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishability. It achieves this goal by selectively reducing the biexciton lifetime with an optical resonator. It demonstrates that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and twofold degenerate optical modes. The in‐depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum‐dot cavity excitation dynamics with full access to photon properties. It reports non‐trivial dependencies on system parameters and use the predictive power of the combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values, here specifically for the telecom C‐band at 1550 nm.

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“…Despite these recent results, further improvements in the sample design and realization can be obtained: from the growth perspective, the presence of a p-layer in the implementation of the diode embedding the QDs requires the doping with carbon atoms that constitute an impurity during growth and in the MBE chamber itself, despite a minimal memory effect. ,, In high-frequency electrical device applications, using holes in p-doped structures instead of electrons in n-doped structures would limit the achievable speed due to their 20-times lower mobility allowing for fast control . For example, a scheme theoretically proposed in ref indeed requires an electrical Stark shift of the QD transitions on subpicosecond time scales to implement cavity-mediated single-photon and photon-pair generation with QDs. Additionally, in purely n-doped architectures (e.g., waveguides), the doping-related free carrier absorption is expected to be only half the p-type value, as reported in ref .…”

mentioning

confidence: 99%

A Unipolar Quantum Dot Diode Structure for Advanced Quantum Light Sources

et al. 2023

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Triggered, indistinguishable single photons are crucial in various quantum photonic implementations. Here, we realize a novel n + −i−n ++ diode structure embedding semiconductor quantum dots: the gated device enables spectral tuning of the transitions and deterministic control of the charged states. Blinkingfree single-photon emission and high two-photon indistinguishability are observed. The line width's temporal evolution is investigated across over 6 orders of magnitude time scales, combining photon-correlation Fourier spectroscopy, high-resolution photoluminescence spectroscopy, and two-photon interference (visibility of V TPI,2ns = (85.8 ± 2.2)% and V TPI,9ns = (78.3 ± 3.0)%). Most of the dots show no spectral broadening beyond ∼9 ns time scales, and the photons' line width ((420 ± 30) MHz) deviates from the Fourier-transform limit by a factor of 1.68. The combined techniques verify that most dephasing mechanisms occur at time scales ≤2 ns, despite their modest impact. The presence of n-doping implies higher carrier mobility, enhancing the device's appeal for high-speed tunable, high-performance quantum light sources.

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Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots

Cited by 10 publications

References 40 publications

Entangled photons from composite cascade emitters

Entangled photons from composite cascade emitters

On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs

A Unipolar Quantum Dot Diode Structure for Advanced Quantum Light Sources

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