Quantum dots articles within Nature Communications

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  • Article
    | Open Access

    Traditional scintillators face challenges in achieving fast response and avoiding afterglow. Guzelturk et al. report colloidal quantum shell heterostructures with bright multiexciton emission, enabling efficient, fast, and robust scintillation for high-resolution and high-speed X-ray imaging.

    • Burak Guzelturk
    • , Benjamin T. Diroll
    •  & Mikhail Zamkov

  • Article
    | Open Access

    Understanding the microscopic variability of CMOS spin qubits is crucial for developing scalable quantum processors. Here the authors report a combined experimental and numerical study of the effect of interface roughness on variability of quantum dot spin qubits formed at the Si/SiO2 interface.

    • Jesús D. Cifuentes
    • , Tuomo Tanttu
    •  & Andre Saraiva

  • Article
    | Open Access

    An efficient way of realising a large number of telecom single-photon emitters for quantum communication is still missing. Here, the authors use a wide-field imaging technique for fast localization of single InAs/InP quantum dots, which are then integrated into circular Bragg grating cavities featuring high single-photon purity and indistinguishability.

    • Paweł Holewa
    • , Daniel A. Vajner
    •  & Elizaveta Semenova

  • Article
    | Open Access

    Biocompatible afterglow materials have potential in imaging applications, but are challenging to prepare. Here the authors report the development of carbon nanodots with near-infrared afterglow, and demonstrate their use in imaging for tumour resection.

    • Guang-Song Zheng
    • , Cheng-Long Shen
    •  & Chong-Xin Shan

  • Article
    | Open Access

    Real-time adaptive control of a qubit has been demonstrated but limited to single-axis Hamiltonian estimation. Here the authors implement two-axis control of a singlet-triplet spin qubit with two fluctuating Hamiltonian parameters, resulting in improved quality of coherent oscillations.

    • Fabrizio Berritta
    • , Torbjørn Rasmussen
    •  & Ferdinand Kuemmeth

  • Article
    | Open Access

    Electron charge and spin shuttling is a promising technique for connecting distant spin qubits. Here the authors use conveyor-mode shuttling to achieve high-fidelity transport of a single electron spin in Si/SiGe by separation and rejoining of two spin-entangled electrons across a shuttling distance of 560 nm.

    • Tom Struck
    • , Mats Volmer
    •  & Lars R. Schreiber

  • Article
    | Open Access

    Highly polarized nuclear spins can supress decoherence of electron spin qubits, but this requires near-unity polarization. Here the authors implement a protocol combining optical excitation and fast carrier tunnelling to achieve nuclear spin polarizations above 95% in GaAs quantum dots on a timescale of 1 minute.

    • Peter Millington-Hotze
    • , Harry E. Dyte
    •  & Evgeny A. Chekhovich

  • Article
    | Open Access

    Light-matter interfaces implementing arbitrary conditional operations on incoming photons would have several applications in quantum computation and communications. Here, the authors demonstrate conditional polarization rotation induced by a single quantum dot spin embedded in an electrically contacted micropillar, spanning up to a pi flip.

    • E. Mehdi
    • , M. Gundín
    •  & L. Lanco

  • Article
    | Open Access

    Developing quantum networks would require reliable sources of coherent quantum light at telecom wavelengths. Here, the authors employ elastic scattering of excitation laser photons on InAs/InP quantum dots to demonstrate the emission of telecom photons with coherence times longer than the Fourier limit.

    • L. Wells
    • , T. Müller
    •  & A. J. Shields

  • Article
    | Open Access

    Graphene quantum dots promise applications for spin and valley qubits; however a demonstration of phase coherent oscillations has been lacking. Here the authors report coherent charge oscillations and measurements of coherence times in highly tuneable double quantum dots in bilayer graphene.

    • K. Hecker
    • , L. Banszerus
    •  & C. Stampfer

  • Article
    | Open Access

    The authors demonstrate a large ensemble of quantum dots which is characterized using a cryogenic multiplexer-demultiplexer circuit based on selective area growth nanowires, establishing the feasibility of scaling future quantum circuits.

    • Dāgs Olšteins
    • , Gunjan Nagda
    •  & Thomas S. Jespersen

  • Article
    | Open Access

    Colloidal quantum dots remain unexplored for applications in single-electron devices. Here, the authors demonstrate single-electron transistors using single PbS colloidal quantum dot, highlighting their room-temperature operation.

    • Kenji Shibata
    • , Masaki Yoshida
    •  & Yoshihiro Iwasa

  • Article
    | Open Access

    Phase transition dynamics are an important concern in the wide applications of metal halide perovskites. Here authors apply low-dose imaging technique to reveal the phase transition dynamics of CsPbI3 during in-situ heating process with atomic resolution.

    • Mengmeng Ma
    • , Xuliang Zhang
    •  & Boyuan Shen

  • Article
    | Open Access

    Andreev bound states can form in hybrid semiconducting-superconducting devices and can mirror the experimental signatures of the much sought topologically non-trivial Majorana bound states. Here, van Driel, Wang and coauthors present a method of directly measuring the spin-polarized excitation spectrum of Andreev bound states.

    • David van Driel
    • , Guanzhong Wang
    •  & Tom Dvir

  • Article
    | Open Access

    Here, the authors correlate the position and spectral emission properties of single photon emitters in monolayer WSe2 with the surrounding local strain potential by combining deep-subwavelength photoluminescence imaging and atomic force microscopy, providing insights on the microscopic mechanisms behind the formation of the quantum emitters.

    • Artem N. Abramov
    • , Igor Y. Chestnov
    •  & Vasily Kravtsov

  • Article
    | Open Access

    Colloidal semiconductor core-shell nanocrystals are sought after for photonic applications. Here, the authors report coherent heteroepitaxial growth of Ag(In,Ga)S2 core-shell nanocrystals with near-unity photoluminescence quantum yield across almost the full visible range.

    • Hak June Lee
    • , Seongbin Im
    •  & Wan Ki Bae

  • Article
    | Open Access

    As the size of quantum processors scales up, accurate characterization of errors due to various crosstalks between qubits becomes important. Here the authors use a novel benchmarking protocol to study single-gate fidelities in a 2x2 hole spin qubit array in germanium when qubits are driven simultaneously.

    • W. I. L. Lawrie
    • , M. Rimbach-Russ
    •  & M. Veldhorst

  • Article
    | Open Access

    Wigner molecules, or correlated localized electron states, has been reported in semiconductor quantum dots, but their interaction with environment has been less explored. Here the authors use the spin multiplet structure of a three-electron Wigner molecule to enhance and control dynamic nuclear polarization.

    • Wonjin Jang
    • , Jehyun Kim
    •  & Dohun Kim

  • Article
    | Open Access

    Interaction between localized electron spins and nuclear spins causes shifts in nuclear spin energy levels, but how this affects nuclear spin diffusion in quantum dots is not fully understood. Here the authors show that the central electron accelerates nuclear spin diffusion in GaAs/AlGaAs quantum dots.

    • Peter Millington-Hotze
    • , Santanu Manna
    •  & Evgeny A. Chekhovich

  • Article
    | Open Access

    Authors investigate quasi-2D nanoscale emitters on different substrates with tapping mode tip-enhanced spectroscopy. They visualize in-plane near-field and radiative energy propagation via Surface plasmon polaritons launched by the nanoscale emitters on dielectric/Au or SiO2/Si substrates.

    • Kiyoung Jo
    • , Emanuele Marino
    •  & Deep Jariwala

  • Article
    | Open Access

    Lead halide perovskites host bright triplet excitons which have applications in optospintronic devices. Here the authors observe quantum coherence between exciton sublevels without magnetic field and clarify the mechanisms of exciton spin relaxation in ensembles of CsPbBr3 nanocrystals.

    • Rui Cai
    • , Indrajit Wadgaonkar
    •  & Tze Chien Sum

  • Article
    | Open Access

    The lattice strain induced by surface ligands not only stabilizes black phase at room temperature but also enables full-range A-site tuning. Here, authors construct a detailed picture of temperature dependent behaviour of perovskite quantum dots by in situ spectroscopic and structural measurements.

    • Shuo Wang
    • , Qian Zhao
    •  & Guoran Li

  • Article
    | Open Access

    Charge noise degrades the performance of spin qubits hindering scalability. Here the authors engineer the heterogeneous material stack in 28Si/SiGe gate-defined quantum dots, to improve the scattering properties and to reduce charge noise.

    • Brian Paquelet Wuetz
    • , Davide Degli Esposti
    •  & Giordano Scappucci

  • Article
    | Open Access

    The surface localized charges in colloidal quantum dots induce a degradation that limits the electroluminescence performance. Here, Chen et al. propose quantum dots with monmonotonically-graded core/shell/shell structures to boost the device’s performance by reducing the surface-bulk coupling.

    • Xingtong Chen
    • , Xiongfeng Lin
    •  & Song Chen

  • Article
    | Open Access

    Quantum-dot spin qubits in Si/SiGe quantum wells require a large and uniform valley splitting for robust operation and scalability. Here the authors introduce and characterize a new heterostructure with periodic oscillations of Ge atoms in the quantum well, which could enhance the valley splitting.

    • Thomas McJunkin
    • , Benjamin Harpt
    •  & M. A. Eriksson

  • Article
    | Open Access

    Spin qubits in Si/SiGe quantum dots suffer from variability in the valley splitting which will hinder device scalability. Here, by using 3D atomic characterization, the authors explain this variability by random Si and Ge atomic fluctuations and propose a strategy to statistically enhance the valley splitting

    • Brian Paquelet Wuetz
    • , Merritt P. Losert
    •  & Giordano Scappucci

  • Article
    | Open Access

    Applications of ultra-low-loss photonic circuitry in quantum photonics, in particular including triggered single photon sources, are rare. Here, the authors show how InAs quantum dot single photon sources can be integrated onto wafer-scale, CMOS compatible ultra-low loss silicon nitride photonic circuits.

    • Ashish Chanana
    • , Hugo Larocque
    •  & Marcelo Davanco

  • Article
    | Open Access

    Self-assembled PbSe quantum dot (QD) superlattices are a class of materials that promises novel mesoscale electronic properties due to electronic coupling between individual QDs. Here, the authors reveal distinct electronic states manifested by the quantum confinement of charge carriers in epitaxially formed necking between QDs.

    • Mahmut S. Kavrik
    • , Jordan A. Hachtel
    •  & Matt Law

  • Article
    | Open Access

    A coherent quantum link between distant quantum processors is desirable for scaling up of quantum computation. Noiri et al. demonstrate a strategy to link distant quantum processors in silicon, by implementing a shuttling-based two-qubit gate between spin qubits in a Si/SiGe triple quantum dot.

    • Akito Noiri
    • , Kenta Takeda
    •  & Seigo Tarucha

  • Article
    | Open Access

    Observation of a Bloch-Siegert shift has remained elusive. Here, Wu et al, reports spin-selective Bloch-Siegert shift in lead halide perovskite quantum dots, and highlights the importance of many-body interactions in correctly modeling the shift.

    • Yuxuan Li
    • , Yaoyao Han
    •  & Jingyi Zhu

  • Article
    | Open Access

    Nanocrystals are desirable light sources for advanced display technologies. Here, the authors report on double-crowned 2D semiconductor nanoplatelets as light downconverters that offer both green and red emissions to achieve a wide color gamut.

    • Corentin Dabard
    • , Victor Guilloux
    •  & Sandrine Ithurria

  • Article
    | Open Access

    Programming the 3D spatial organization of quantum dots requires precise control over their individual valence, but this is challenging due to the possible presence of multiple binding sites. Here, authors develop a general approach that uses highly programmable wireframe DNA origami structures to control the 3D spatial relationships between QDs and other non-nucleic-acid molecules.

    • Chi Chen
    • , Xingfei Wei
    •  & Mark Bathe

  • Article
    | Open Access

    It has been predicted that longitudinal coupling between a qubit and a superconducting resonator can mediate efficient interactions among distant qubits. Here the authors implement such a coupling between a singlet-triplet qubit in a semiconductor double quantum dot and a high-impedance superconducting resonator.

    • C. G. L. Bøttcher
    • , S. P. Harvey
    •  & A. Yacoby

  • Article
    | Open Access

    Nanoscale emitters are useful for measuring biomolecular interactions, but are limited by weak signals. Here, the authors use a photonic crystal surface for 3000-fold signal enhancement, achieving single emitter sensitivity with extended on-time, and demonstrate its application in miRNA biomarker sensing.

    • Yanyu Xiong
    • , Qinglan Huang
    •  & Brian T. Cunningham

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