Engineering colloidal semiconductor nanocrystals for quantum information processing

Almutlaq, Jawaher; Liu, Yuan; Mir, Wasim J.; Sabatini, Randy P.; Englund, Dirk; Bakr, Osman M.; Sargent, Edward H.

doi:10.1038/s41565-024-01606-4

Cited by 7 publications

(3 citation statements)

References 125 publications

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“…[1][2][3] More recently, colloidal QDs have been explored as solid-state single-photon emitters, essential components in quantum information technologies. [4][5][6][7] Colloidal QDs offer seamless on-chip integration with nanophotonic elements, high spectral turnability and cost-effective scalable production, making them a compelling alternative to epitaxial self-assembled QDs.…”

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confidence: 99%

Suppressed Blinking and Pure Single-Photon Emission in Near-Infrared InAs Colloidal Quantum Dots with Strong Exciton Confinement

Yang,

Li,

Zhai

et al. 2024

Preprint

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Colloidal quantum dots (QDs) have emerged as potential single-photon emitters for quantum information processing due to their high color tunability and scalable production. However, strong Auger non-radiative recombination, while enabling photon antibunching in single QDs, also causes fluorescence blinking when QDs become charged. This poses a significant challenge in achieving both blinking-free emission and high-purity single-photon emission. Here, we address this issue with highly bright near-infrared (NIR) emitting InAs/InP/ZnSe/ZnS QDs, where the ZnSe layer acts as a confining layer to create a straddling band alignment. Single-QD measurements reveal that QDs with a thin ZnSe shell exhibit frequent Auger-related blinking. In contrast, increasing the thickness of the ZnSe shell reduces photo-charging by isolating excitons from the surface, significantly suppressing blinking. Importantly, these thick-shell QDs maintain high single-photon purity, with a g(2)(0) value below 1%. This results from strong exciton confinement in the cores, confirmed by an ultrafast biexciton Auger decay rate. These findings offer a solution to achieve non-blinking characteristics without compromising single-photon purity, highlighting the potential of InAs-based QDs as efficient quantum light sources for telecommunication applications.

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confidence: 99%

Suppressed Blinking and Pure Single-Photon Emission in Near-Infrared InAs Colloidal Quantum Dots with Strong Exciton Confinement

Yang,

Li,

Zhai

et al. 2024

Preprint

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“…This synthetic control of surface morphology has enabled photoluminescence quantum yields approaching unity and optical coherence times approaching their transform limit in a variety of material systems. − Colloidal nanocrystals also provide flexibility in integrating with various platforms and structures, enabling their applications in optoelectronics, − medicine and biology, − nanophotonics, , and catalysis . However, investigation of optically active spin qubits in colloidal nanocrystals has so far been limited . To date, only spin defects operating in the visible portion of the spectrum have been studied and their corresponding spin-photon interface remains underdeveloped. , Furthermore, a comprehensive understanding of the factors that limit the spin coherence in doped nanocrystal systems is still to be developed.…”

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confidence: 99%

“…25 However, investigation of optically active spin qubits in colloidal nanocrystals has so far been limited. 26 To date, only spin defects operating in the visible portion of the spectrum have been studied and their corresponding spin-photon interface remains underdeveloped. 27,28 Furthermore, a comprehensive understanding of the factors that limit the spin coherence in doped nanocrystal systems is still to be developed.…”

mentioning

confidence: 99%

Coherent Erbium Spin Defects in Colloidal Nanocrystal Hosts

Wong,

Onizhuk,

Nagura

et al. 2024

ACS Nano

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We demonstrate nearly a microsecond of spin coherence in Er 3+ ions doped in cerium dioxide nanocrystal hosts, despite a large gyromagnetic ratio and nanometric proximity of the spin defect to the nanocrystal surface. The long spin coherence is enabled by reducing the dopant density below the instantaneous diffusion limit in a nuclear spin-free host material, reaching the limit of a single erbium spin defect per nanocrystal. We observe a large Orbach energy in a highly symmetric cubic site, further protecting the coherence in a qubit that would otherwise rapidly decohere. Spatially correlated electron spectroscopy measurements reveal the presence of Ce 3+ at the nanocrystal surface, which likely acts as extraneous paramagnetic spin noise. Even with these factors, defectembedded nanocrystal hosts show tremendous promise for quantum sensing and quantum communication applications, with multiple avenues, including core−shell fabrication, redox tuning of oxygen vacancies, and organic surfactant modification, available to further enhance their spin coherence and functionality in the future.

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Poly (heptazine imide) nanocrystal for hydrogen peroxide evolution in the dark by accumulating photo-generated electrons

Kou,

Lian,

Xie

et al. 2024

Nano Res.

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Engineering colloidal semiconductor nanocrystals for quantum information processing

Cited by 7 publications

References 125 publications

Suppressed Blinking and Pure Single-Photon Emission in Near-Infrared InAs Colloidal Quantum Dots with Strong Exciton Confinement

Suppressed Blinking and Pure Single-Photon Emission in Near-Infrared InAs Colloidal Quantum Dots with Strong Exciton Confinement

Coherent Erbium Spin Defects in Colloidal Nanocrystal Hosts

Poly (heptazine imide) nanocrystal for hydrogen peroxide evolution in the dark by accumulating photo-generated electrons

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