Superconducting devices articles within Nature Communications

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  • Article
    | Open Access

    The authors study the [Nb/V/Ta] superconducting artificial superlattice, known to support a superconducting diode effect, by pulsed THz spectroscopy and simultaneous transport. They found a non-monotonic switching between the superconducting and normal state, which can be explained if the THz-driven vortex depinning determines the critical current.

    • Fumiya Sekiguchi
    • , Hideki Narita
    •  & Yoshihiko Kanemitsu

  • Article
    | Open Access

    At the quantum limit, vacuum fluctuations determine the precision with which a signal can be measured. In this work the authors use a technique known as squeezing to greatly reduce the vacuum fluctuation noise present at microwave frequencies.

    • Arjen Vaartjes
    • , Anders Kringhøj
    •  & Jarryd J. Pla

  • Article
    | Open Access

    Superconducting nanowire single-photon detectors require operation at T < 4 K, and successful attempts to extend their operation at 20 K and above using high-TC BSCCO flakes come at the cost of lower scalability to large areas. Here, the authors break this trade-off by using high-quality MgB2 films and exploiting a helium-ion beam-based irradiation process.

    • Ilya Charaev
    • , Emma K. Batson
    •  & Karl K. Berggren

  • Article
    | Open Access

    The authors experimentally study a chain of superconducting islands (SI) and quantum dots (QD), where a Bogoliubov quasiparticle occupies each SI. They demonstrate correlations between the quasiparticles in each SI mediated by a single spin on the QD, known as an “over-screened" doublet state of the QD.

    • Juan Carlos Estrada Saldaña
    • , Alexandros Vekris
    •  & Jesper Nygård

  • Article
    | Open Access

    Interesting non-Hermitian quantum dynamics can be accessed in analogue quantum simulators consisting of Hermitian bosonic systems with squeezing and antisqueezing terms. Here, the authors use a coplanar waveguide resonator connected to a SQUID to simulate the bosonic version of the Kitaev chain.

    • Jamal H. Busnaina
    • , Zheng Shi
    •  & Christopher M. Wilson

  • Article
    | Open Access

    Quantum devices exhibiting non-reciprocal behaviour have been attracting attention for fundamental studies and applications. Here the authors report a microwave quantum diode based on a superconducting flux qubit coupled to two resonators, which has the advantage of compactness and scalability.

    • Rishabh Upadhyay
    • , Dmitry S. Golubev
    •  & Jukka P. Pekola

  • Article
    | Open Access

    Gate-defined superconducting moiré devices offer high tunability for probing the nature of superconducting and correlated insulating states. Here, the authors report the Little–Parks and Aharonov–Bohm effects in a single gate-defined magic-angle twisted bilayer graphene device.

    • Shuichi Iwakiri
    • , Alexandra Mestre-Torà
    •  & Klaus Ensslin

  • Article
    | Open Access

    M. Valentini et al. study superconducting quantum interference devices (SQUIDs) where the weak link of the Josephson junctions is a germanium 2D hole gas. They report signatures of the tunneling of pairs of Cooper pairs. For a particular microwave drive power, they observe a 100% efficient superconducting diode effect.

    • Marco Valentini
    • , Oliver Sagi
    •  & Georgios Katsaros

  • Article
    | Open Access

    S. Matsuo et al. report tunneling spectroscopy measurements on a device consisting of two Josephson junctions (JJ) sharing a single superconducting electrode. In isolation, each JJ would host an Andreev bound state (ABS). In their coherently-coupled JJs, the authors report the formation of an Andreev molecule due to hybridization of the two ABSs.

    • Sadashige Matsuo
    • , Takaya Imoto
    •  & Seigo Tarucha

  • Article
    | Open Access

    The predicted dissipative quantum phase transition in a Josephson junction coupled to resistive environment has been examined in recent experiments. In a heat transport experiment, Subero et al. show that the junction acts as an inductor at high frequencies, while DC charge transport confirms insulating behaviour.

    • Diego Subero
    • , Olivier Maillet
    •  & Jukka P. Pekola

  • Article
    | Open Access

    Nonlinear damping is a ubiquitous phenomenon in technological applications involving oscillators, but its origin is sometimes poorly understood. Here, the authors highlight how the interplay between quantum noise and Kerr anharmonicity introduces an effect resembling nonlinear damping.

    • Mario F. Gely
    • , Adrián Sanz Mora
    •  & Gary A. Steele

  • Article
    | Open Access

    The authors study transport in Nb-(Pt/Cu)-Nb Josephson junctions (JJ), where Pt/Cu is a Rashba interface. Due to the Rashba–Edelstein effect, a charge current leads to a non-equilibrium spin moment at the Pt/Cu interface, which can be measured from a shift of the Fraunhofer pattern of the JJ.

    • Tapas Senapati
    • , Ashwin Kumar Karnad
    •  & Kartik Senapati

  • Article
    | Open Access

    Two-dimensional magnets and superconductors are emerging as tunable building blocks for quantum computing and superconducting spintronic devices. Here, Jo et al. demonstrate NbSe2/CrSBr van der Waals superconducting spin valves that exhibit infinite magnetoresistance and nonreciprocal charge transport, arising from a unique metamagnetic transition in CrSBr.

    • Junhyeon Jo
    • , Yuan Peisen
    •  & Luis E. Hueso

  • Article
    | Open Access

    The authors study Andreev bound states (ABSs) in 3-terminal InAs/Al Josephson-junction devices. They find signatures of hybridization between two ABSs, with band structure tunable by electric currents that generate magnetic fluxes threading superconducting loops in the device.

    • Marco Coraiola
    • , Daniel Z. Haxell
    •  & Fabrizio Nichele

  • Article
    | Open Access

    Tunneling spectroscopy is widely used to examine the subgap spectra in semiconductor/superconductor nanostructures. Here, the authors develop an alternative type of tunnel probe for InSb-Al hybrid nanowires, enabling study of the spatial extension of Andreev bound states.

    • Vukan Levajac
    • , Ji-Yin Wang
    •  & Leo P. Kouwenhoven

  • Article
    | Open Access

    Schrodinger’s cat states constitute an important resource for quantum information processing, but present challenges in terms of scalabilty and controllability. Here, the authors exploit fast Kerr nonlinearity modulation to generate and store cat states in superconducting circuits in a more scalable way.

    • X. L. He
    • , Yong Lu
    •  & Z. R. Lin

  • Article
    | Open Access

    Dense random access memory is required for building future generations of superconducting computers. Here the authors study vortex-based memory cells, demonstrate their scalability to submicron sizes and robust word and bit-line operation at zero magnetic field.

    • Taras Golod
    • , Lise Morlet-Decarnin
    •  & Vladimir M. Krasnov

  • Article
    | Open Access

    By coupling two quantum dots via a superconductor-semiconductor hybrid region in a 2D electron gas, the authors achieve efficient splitting of Cooper pairs. Further, by applying a magnetic field perpendicular to the spin-orbit field, they can induce and measure large triplet correlations in the Cooper pair splitting process.

    • Qingzhen Wang
    • , Sebastiaan L. D. ten Haaf
    •  & Srijit Goswami

  • Article
    | Open Access

    The practical device application of transition-metal dichalcogenide superconductors (TMDSCs) is limited by their environmental instability. Here, the authors report a generic, non-destructive, and scalable strategy to fabricate TMDSC nanocircuits via the topotactic conversion of prepatterned metallic precursors.

    • Xiaohan Wang
    • , Hao Wang
    •  & Peiheng Wu

  • Article
    | Open Access

    Removing excess energy (cooling) and reducing noise in superconducting quantum circuits is central to improved coherence. Lucas et al. demonstrate cooling of a superconducting resonator and its noisy environment to sub-mK temperatures by immersion in liquid 3He.

    • M. Lucas
    • , A. V. Danilov
    •  & S. E. de Graaf

  • Article
    | Open Access

    The proximity effect in semiconductor-superconductor nanowires is expected to generate an induced gap in the semiconductor. Here, the authors study the superconducting proximity effect in InSb nanowires with an Al/Pt shell, demonstrating control of the induced gap using electric and magnetic fields.

    • Nick van Loo
    • , Grzegorz P. Mazur
    •  & Leo P. Kouwenhoven

  • Article
    | Open Access

    Non-reciprocal critical current in a Josephson junction device is known as the Josephson diode effect. Here, the authors observe such an effect in 3-terminal Josephson devices based on InAs two-dimensional electron gas proximitized by an epitaxial Al layer.

    • Mohit Gupta
    • , Gino V. Graziano
    •  & Vlad S. Pribiag

  • Article
    | Open Access

    Designing efficient photonic neuromorphic systems remains a challenge. Here, the authors develop a new class of memristor sensitive to the dual electro-optical history obtained by exploiting electrochemical, photovoltaic and photo-assisted oxygen ion motion effects at a high temperature superconductor / semiconductor interface.

    • Ralph El Hage
    • , Vincent Humbert
    •  & Javier E. Villegas

  • Article
    | Open Access

    Classical mechanics predicts a bistability in the dynamics of the Duffing oscillator, a key model of nonlinear dynamics. By performing quantum simulations of the model, Chen et al. explain the bistability by quantum metastable states with long lifetimes and reveal a first-order dissipative phase transition.

    • Qi-Ming Chen
    • , Michael Fischer
    •  & Rudolf Gross

  • Article
    | Open Access

    Disorder and device variability in hybrid superconductor-semiconductor devices pose challenges for their application in quantum technologies. Here, the authors show that Joule heating can provide a detailed fingerprint of such devices, uncovering different sources of inhomogeneities.

    • A. Ibabe
    • , M. Gómez
    •  & E. J. H. Lee

  • Article
    | Open Access

    Superconductivity has been discovered in atomically thin two-dimensional van der Waals materials by resistance measurements, but magnetic measurements are lacking. Here, the authors use a micron-scale SQUID magnetometer to measure the superfluid response of exfoliated MoS2.

    • Alexander Jarjour
    • , G. M. Ferguson
    •  & Katja C. Nowack

  • Article
    | Open Access

    A nonreciprocal critical current is known as the superconducting diode effect (SDE). Here, the authors use SQUID-on-tip to study SDE in a EuS/Nb bilayer and find that the stray field from magnetized EuS creates screening currents in the Nb, which lead to SDE by affecting vortex flow dynamics.

    • Alon Gutfreund
    • , Hisakazu Matsuki
    •  & Yonathan Anahory

  • Article
    | Open Access

    A superconducting diode effect was recently reported in Nb/V/Ta superlattices, but the mechanism is not yet clear. Here, the authors study non-reciprocal critical current in Al/InAs nanowires and propose a generic extrinsic mechanism involving field-generated diamagnetic currents, which may explain the earlier Nb/V/Ta results.

    • Ananthesh Sundaresh
    • , Jukka I. Väyrynen
    •  & Leonid P. Rokhinson

  • Article
    | Open Access

    Quantum bath engineering in the context of circuit quantum electrodynamics typically relies on single-photon losses. Aiello et al. demonstrate an approach for engineering higher-order photon losses in a microwave resonator coupled to a tunnel junction, which may be utilized in quantum information applications.

    • Gianluca Aiello
    • , Mathieu Féchant
    •  & Jérôme Estève

  • Article
    | Open Access

    While transmon is the most widely used superconducting qubit, the search for alternative qubit designs with improved characteristic is ongoing. Hyyppä et al. demonstrate a novel superconducting qubit, the unimon, that combines high anharmonicity and protection against low-frequency charge noise and flux noise.

    • Eric Hyyppä
    • , Suman Kundu
    •  & Mikko Möttönen

  • Article
    | Open Access

    Multiterminal Josephson junctions may provide a novel way to realize topologically non-trivial band structures in an n-dimensional phase space. Here, the authors experimentally demonstrate the proposed necessary conditions to measure these states.

    • Gino V. Graziano
    • , Mohit Gupta
    •  & Vlad S. Pribiag

  • Article
    | Open Access

    Superconducting quantum processors need to balance intentional disorder (to protect qubits) and nonlinear resonator coupling (to manipulate qubits), while avoiding chaotic instabilities. Berke et al. use the techniques of many-body localization theory to study the stability of current platforms against quantum chaos.

    • Christoph Berke
    • , Evangelos Varvelis
    •  & David P. DiVincenzo

  • Article
    | Open Access

    Diodes are characterized by mono-directional flow of current, yet this simplicity belies their critical importance in electronics and optics. Here, Strambini et al demonstrate a superconducting quasi-particle equivalent, achieved by the use of a thin ferromagnetic insulator.

    • E. Strambini
    • , M. Spies
    •  & F. Giazotto

  • Article
    | Open Access

    The fate of Yu-Shiba-Rusinov states in the presence of a strong Coulomb repulsion in a superconductor remains unknown. Here, the authors couple a quantum dot to a superconducting island with a tunable Coulomb repulsion, where they find a singlet many-body state which, by a strong Coulomb repulsion, changes to a two-body state.

    • Juan Carlos Estrada Saldaña
    • , Alexandros Vekris
    •  & Jesper Nygård

  • Article
    | Open Access

    The superconductor-ferromagnet interface provides a unique opportunity to study the interplay between superconductivity and ferromagnetism. Here, the authors build a van der Waals ferromagnetic Josephson junction evidencing a strong 0 and π phase Josephson coupling.

    • Linfeng Ai
    • , Enze Zhang
    •  & Shaoming Dong

  • Article
    | Open Access

    Existing schemes for coherent control and measurements in superconducting circuits rely on the coupling between superconducting qubits and cavity photons. Here the authors implement conditional fluorescence readout of a fluxonium qubit placed inside an open waveguide, with no coupling to cavity modes.

    • Nathanaël Cottet
    • , Haonan Xiong
    •  & Vladimir E. Manucharyan

  • Article
    | Open Access

    Advanced fabrication techniques enable a wide range of quantum devices, such as the realization of a topological qubit. Here, the authors introduce an on-chip fabrication technique based on shadow walls to implement topological qubits in an InSb nanowire without fabrication steps such as lithography and etching.

    • Sebastian Heedt
    • , Marina Quintero-Pérez
    •  & Leo P. Kouwenhoven

  • Article
    | Open Access

    Coherent conversion between optical and microwave photonics is needed for future quantum applications. Here, the authors combine thin-film lithium niobate and superconductor platforms as a hybrid electro-optic system to achieve high-efficiency frequency conversion between microwave and optical modes.

    • Yuntao Xu
    • , Ayed Al Sayem
    •  & Hong X. Tang

  • Article
    | Open Access

    Background radiation has been identified as a key factor limiting the coherence times of superconducting circuits. Here, the authors measure the impact of environmental and cosmic radiation on a superconducting resonator with varying degrees of shielding, including an underground facility.

    • L. Cardani
    • , F. Valenti
    •  & I. M. Pop

  • Article
    | Open Access

    A recent report on electrostatic field effect in superconducting devices provides a high potential for advanced quantum technology, but it remains controversial. Here, the authors report that the suppression of critical current, which was attributed to the field effect, can instead be explained by quasiparticle excitations in the constriction of superconducting devices.

    • I. Golokolenov
    • , A. Guthrie
    •  & V. Tsepelin

  • Article
    | Open Access

    A superconducting diode is dissipationless and desirable for electronic circuits with ultralow power consumption, yet it remains challenging to realize it. Here, the authors achieve a superconducting diode in a conventional superconducting film patterned with a conformal array of nanoscale holes.

    • Yang-Yang Lyu
    • , Ji Jiang
    •  & Wai-Kwong Kwok

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