A gated quantum dot strongly coupled to an optical microcavity

Najer, Daniel; Söllner, Immo; Sekatski, Pavel; Dolique, V.; Löbl, Matthias C.; Riedel, Daniel; Schott, Rüdiger; Starosielec, Sebastian; Valentin, Sascha R.; Wieck, A. D.; Sangouard, Nicolas; Ludwig, Arne; Warburton, Richard J.

doi:10.1038/s41586-019-1709-y

Cited by 218 publications

(172 citation statements)

References 41 publications

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“…Assuming that the slight increase in broadening with respect to the transform limit arises solely from charge noise, the linewidth measurement places an upper bound of~3.0 Vcm −1 for the root-mean-square (rms) electric field noise at the location of QD1. This upper bound is comparable to the best gated InGaAs QD devices 20,29,40,42,43 . For applications as single-photon source, it is crucial to demonstrate that the photons are emitted one by one, i.e., photon anti-bunching.…”

Section: Resultsmentioning

confidence: 61%

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Low-noise GaAs quantum dots for quantum photonics

et al. 2020

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Quantum dots are both excellent single-photon sources and hosts for single spins. This combination enables the deterministic generation of Raman-photons—bandwidth-matched to an atomic quantum-memory—and the generation of photon cluster states, a resource in quantum communication and measurement-based quantum computing. GaAs quantum dots in AlGaAs can be matched in frequency to a rubidium-based photon memory, and have potentially improved electron spin coherence compared to the widely used InGaAs quantum dots. However, their charge stability and optical linewidths are typically much worse than for their InGaAs counterparts. Here, we embed GaAs quantum dots into an n-i-p-diode specially designed for low-temperature operation. We demonstrate ultra-low noise behaviour: charge control via Coulomb blockade, close-to lifetime-limited linewidths, and no blinking. We observe high-fidelity optical electron-spin initialisation and long electron-spin lifetimes for these quantum dots. Our work establishes a materials platform for low-noise quantum photonics close to the red part of the spectrum.

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Section: Resultsmentioning

confidence: 61%

“…Applied to a droplet GaAs QD, such techniques could prolong the spin dephasing time to values several orders of magnitude above the radiative lifetime. In this case, in combination with optical cavities 20 , droplet GaAs QDs can potentially serve as fast, high-fidelity sources of spin-photon pairs and cluster states 21 .…”

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confidence: 99%

Low-noise GaAs quantum dots for quantum photonics

et al. 2020

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“…Quantum dots (QDs) in nanophotonic structures are excellent sources of single photons [10][11][12][13][14] , and planar waveguides are well suited for scaling up to multiple photons and emitters thanks to near-unity photon-emitter coupling 15 and advanced on-chip functionalities 16 . An ideal single-photon source requires suppressing noise and decoherence, which notably has been demonstrated in electrically contacted heterostructures [17][18][19][20] through resonant optical excitation. However, resonant optical excitation is challenging to implement experimentally as it requires suppressing the excitation laser (same frequency as the QD emission) without affecting the source efficiency.…”

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confidence: 99%

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

et al. 2020

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A deterministic source of coherent single photons is an enabling device for quantum information processing. Quantum dots in nanophotonic structures have been employed as excellent sources of single photons with the promise of scaling up towards multiple photons and emitters. It remains a challenge to implement deterministic resonant optical excitation of the quantum dot required for generating coherent single photons, since residual light from the excitation laser should be suppressed without compromising source efficiency and scalability. Here, we present a planar nanophotonic circuit that enables deterministic pulsed resonant excitation of quantum dots using two orthogonal waveguide modes for separating the laser and the emitted photons. We report a coherent and stable single-photon source that simultaneously achieves high-purity (g (2) (0) = 0.020 ± 0.005), high-indistinguishability (V = 96 ± 2%), and >80% coupling efficiency into the waveguide. Such 'plug-and-play' single-photon source can be integrated with on-chip optical networks implementing photonic quantum processors.

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“…In parallel to these studies, semiconductor cavity QED systems have shown similar QED phenomena [ 6 ]. Nowadays, the atomic and semiconductor cavity QED systems [ 7 , 8 , 9 ] present several applications in quantum computing to conceive quantum gates and networks [ 10 ]. In particular, spatially separated qubits are proposed as potential physical realization for quantum networks [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Nonclassical Effects Based on Husimi Distributions in Two Open Cavities Linked by an Optical Waveguide

Mohamed

Eleuch

2020

Entropy

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Nonclassical effects are investigated in a system formed by two quantum wells, each of which is inside an open cavity. The cavities are spatially separated, linked by a fiber, and filled with a linear optical medium. Based on Husimi distributions (HDs) and Wehrl entropy, we explore the effects of the physical parameters on the generation and the robustness of the mixedness and HD information in the phase space. The generated quantum coherence and the HD information depend crucially on the cavity-exciton and fiber cavity couplings as well as on the optical medium density. The HD information and purity are lost due to the dissipation. This loss may be inhibited by increasing the optical susceptibility as well as the couplings of the exciton-cavity and the fiber-cavity. These parameters control the regularity, amplitudes, and frequencies of the generated mixedness.

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A gated quantum dot strongly coupled to an optical microcavity

Cited by 218 publications

References 41 publications

Low-noise GaAs quantum dots for quantum photonics

Low-noise GaAs quantum dots for quantum photonics

On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source

Nonclassical Effects Based on Husimi Distributions in Two Open Cavities Linked by an Optical Waveguide

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