Quantum physics articles within Nature Communications

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  • Article
    | Open Access

    A travelling wave inside a metal slit can reveal its own waveform by probing deflecting motions of charged particles. Here, a real-time THz oscilloscope was demonstrated by utilizing the relativistic electrons and the subwavelength slit waveguide.

    • In Hyung Baek
    • , Hyun Woo Kim
    •  & Young Uk Jeong

  • Article
    | Open Access

    The combination of superconducting nanowire single photon detectors and electro-optically reconfigurable circuits in a cryogenic environment is notoriously difficult to reach. Here, the authors realise this on a Lithium-Niobate-On-Insulator platform, reaching high speed modulation at a frequency up to 1 GHz.

    • Emma Lomonte
    • , Martin A. Wolff
    •  & Francesco Lenzini

  • Article
    | Open Access

    Single-photon emitters in 2D semiconductors hold promise for quantum applications, but usually operate in the 500-800 nm wavelength range. Here, the authors report site-controlled creation of quantum emitters in the telecommunication wavelength window by coupling 2D MoTe2 to strain inducing nano-pillar arrays.

    • Huan Zhao
    • , Michael T. Pettes
    •  & Han Htoon

  • Article
    | Open Access

    Cold atoms have recently become a versatile platform for the study of quantum transport phenomena. Here the authors realize an alternative experimental scheme for quantum transport with cold atoms, by using spin-dependent impurity scattering in a spinful Fermi gas instead of spatially separated particle distributions.

    • Koki Ono
    • , Toshiya Higomoto
    •  & Yoshiro Takahashi

  • Article
    | Open Access

    When trying to characterise a bath coupled to a sensor qubit, one should consider that quantum environments change their properties in response to external perturbations. Here, the authors show how back-action of the qubit on the bath leads to a quench, which can be used to infer the bath spectral function.

    • Yu-Xin Wang
    •  & Aashish A. Clerk

  • Article
    | Open Access

    Quantum simulations of lattice gauge theories are in principle scalable, but their extension to dynamically coupled matter has proven difficult. In this work, the authors use a variational quantum eigensolver to simulate a non-Abelian LGT including the effects of both gauge fields and dynamical fermions.

    • Yasar Y. Atas
    • , Jinglei Zhang
    •  & Christine A. Muschik

  • 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

    Reliable and fast active reset protocols are key to the functioning of quantum computing systems. Here, the authors use parametric driving to swap an excitation from a transmon qubit to its readout resonator within 34 ns, with negligible effects on neighboring qubits.

    • Yu Zhou
    • , Zhenxing Zhang
    •  & Shengyu Zhang

  • Article
    | Open Access

    Creating atomically-precise quantum architectures with high digital fidelity and desired quantum states is an important goal for quantum technology applications. Here the authors devise an on-surface synthetic protocol to construct atomically-precise covalently linked organic quantum corrals with the formation of a series of new quantum resonance states.

    • Xinnan Peng
    • , Harshitra Mahalingam
    •  & Jiong Lu

  • Article
    | Open Access

    Non-additivity of the quantum channel coherent information is known to occur in some very noisy channels, but its fundamental origin is unclear. Here, the author explains its link with log singularity of quantum entropy, and shows that it can also come up for low-noise channels.

    • Vikesh Siddhu

  • Article
    | Open Access

    Non-equilibrium Bose-Einstein condensates exist in different systems like polaritons, photons. Here the authors demonstrate photonic BECs in an excited or a non-equilibrium state and explore the flow of the photons coupled to the interferometer in order to minimize the loss.

    • Mario Vretenar
    • , Chris Toebes
    •  & Jan Klaers

  • Article
    | Open Access

    Three-dimensional topological insulators have become a research focal point on topological quantum matter. Here, the authors propose the non-Hermitian analogue, the exceptional topological insulator, with anomalous surface states only existing within the topological bulk embedding.

    • M. Michael Denner
    • , Anastasiia Skurativska
    •  & Titus Neupert

  • Article
    | Open Access

    Laser performance is constrained by various factors. Here, the authors show theoretically that the linewidth can be reduced below the standard quantum limit by engineering the output coupling of a laser to reduce noise, and discuss the potential practical implementation of this approach.

    • Chenxu Liu
    • , Maria Mucci
    •  & David Pekker

  • Article
    | Open Access

    Strong light-matter coupling has been realized at the level of single atoms and photons throughout most of the electromagnetic spectrum, except for the THz range. Here, the authors report a THz-scale transport gap, induced by vacuum fluctuations in carbon nanotube quantum dot through the deep strong coupling of a single electron to a THz resonator.

    • F. Valmorra
    • , K. Yoshida
    •  & T. Kontos

  • Article
    | Open Access

    N00N states are a key resource in quantum metrology, but the use of their multi-mode extension for multiparameter estimation has been elusive so far. Here, the authors use multi-mode N00N states - with N=2 photons in 4 modes - for multiple-phase estimation saturating the quantum Cramer-Rao bound.

    • Seongjin Hong
    • , Junaid ur Rehman
    •  & Hyang-Tag Lim

  • Article
    | Open Access

    So far, experimental results have favoured the often unstated assumption that quantum statistical properties of multiparticle systems are preserved in plasmonic platforms. Here, the authors show how multiparticle interference in photon-plasmon scattering can modify the excitation mode of plasmonic systems.

    • Chenglong You
    • , Mingyuan Hong
    •  & Omar S. Magaña-Loaiza

  • Article
    | Open Access

    Quantifying dimensionality of high-dimensional entangled states is challenging, especially in the presence of mixedness and noise. Here, the authors propose and demonstrate a method to quantify the dimensionality and purity of a bi-photon HD entangled state, scaling linearly with entanglement dimension.

    • Isaac Nape
    • , Valeria Rodríguez-Fajardo
    •  & Andrew Forbes

  • Article
    | Open Access

    Efficient conversion of microwave photons into electrical current would enable several applications in quantum technologies, especially if one could step outside of the gated-time regime. Here, the authors demonstrate continuous-time microwave photoconversion in double quantum dots with 6% efficiency.

    • Waqar Khan
    • , Patrick P. Potts
    •  & Ville F. Maisi

  • Article
    | Open Access

    The question whether a given isolated quantum many-body system would thermalize has currently no general answer. Here, Shiraishi and Matsumoto demonstrate the computational universality of thermalization phenomena already for simplified 1D systems, thus proving that the thermalization problem is undecidable.

    • Naoto Shiraishi
    •  & Keiji Matsumoto

  • Article
    | Open Access

    The way quantum simulation algorithms are translated into specific hardware implementations often translates into additional overhead. Here, the authors improve the efficiency of Hamiltonian simulation using a method that allows efficient synthesis of multi-qubit evolutions from two-qubit interactions.

    • Laura Clinton
    • , Johannes Bausch
    •  & Toby Cubitt

  • Article
    | Open Access

    In quantum mechanics, counterfactual behaviours are generally associated with particles being affected by events taking place where they can’t be found. Here, the authors consider extended quantum Cheshire cat scenarios where a particle can be influenced in regions where only its disembodied property has entered.

    • Yakir Aharonov
    • , Eliahu Cohen
    •  & Sandu Popescu

  • Article
    | Open Access

    Microcavity exciton-polaritons in atomically thin semiconductors are a promising platform for valley manipulation. Here, the authors show valley-selective control of polariton energies in monolayer WS2 using the optical Stark effect, thereby extending coherent valley manipulation to a hybrid light-matter regime

    • Trevor LaMountain
    • , Jovan Nelson
    •  & Nathaniel P. Stern

  • Article
    | Open Access

    It was predicted that complex thermalizing behaviour can arise in many-body systems in the absence of disorder. Here, the authors observe non-ergodic dynamics in a tilted optical lattice that is distinct from previously studied regimes, and propose a microscopic mechanism that is due to emergent kinetic constrains.

    • Sebastian Scherg
    • , Thomas Kohlert
    •  & Monika Aidelsburger

  • Article
    | Open Access

    Current hypotheses towards quantisation of gravity imply the presence of a minimal length scale, which may have a role in explaining quantum-to-classical transition. Here, the authors show how assuming the minimal length scale to be a fluctuating quantity leads to a possible universal decoherence mechanism.

    • Luciano Petruzziello
    •  & Fabrizio Illuminati

  • Article
    | Open Access

    Spin defects in two-dimensional materials potentially offer unique advantages for quantum sensing in terms of sensitivity and functionality. Here, the authors demonstrate the use of spin defects in hexagonal boron nitride as sensors of magnetic field, temperature and pressure, and show that their performance is comparable or exceeds that of existing platforms.

    • Andreas Gottscholl
    • , Matthias Diez
    •  & Vladimir Dyakonov

  • Article
    | Open Access

    Single-molecular magnets (SMM) are promising candidates for quantum technologies given the ease of repeatable manufacture and potential as qudits. Here, Biard et al succeed in electronically reading out a SMM containing two high-spin terbium atoms, allowing for a 16 dimensional Hilbert space.

    • Hugo Biard
    • , Eufemio Moreno-Pineda
    •  & Franck Balestro

  • Article
    | Open Access

    Several key tasks in quantum information processing can be regarded as channel manipulation. Here, focusing on the class of distillation protocols, the authors derive general bounds on resource overhead and incurred errors, showing application to magic state distillation and quantum channel capacities.

    • Bartosz Regula
    •  & Ryuji Takagi

  • Article
    | Open Access

    Nuclear spins in diamond are promising for applications in quantum technologies due to their long coherence times. Here, the authors demonstrate a scalable electrical readout of individual intrinsic 14N nuclear spins in diamond, mediated by hyperfine coupling to electron spin of the NV center, as a step towards room-temperature nanoscale diamond quantum devices.

    • Michal Gulka
    • , Daniel Wirtitsch
    •  & Milos Nesladek

  • Article
    | Open Access

    Photon echo techniques are difficult to implement in the quantum regime due to coherent and spontaneous emission noise. Here, the authors propose a low-noise photon-echo quantum memory approach based on all-optical control in a four-level system, and demonstrate it using a Eu3+:Y2SiO5 crystal.

    • You-Zhi Ma
    • , Ming Jin
    •  & Guang-Can Guo

  • Article
    | Open Access

    Single atom magnets on surfaces offer potentially long lived and stable spin states, particular lanthanides, which can be adsorbed onto Magnesium Oxide. Here, the authors report on Dysprosium adsorbed onto Magnesium Oxide, which exhibits large magnetic anisotropy energy, and a spin life time of several days at low temperatures

    • A. Singha
    • , P. Willke
    •  & T. Choi

  • Article
    | Open Access

    Hybrid devices based on electrons on helium may find application in quantum devices. Here the authors demonstrate surface acoustic wave driven acoustoelectric transport of electrons on superfluid helium.

    • H. Byeon
    • , K. Nasyedkin
    •  & J. Pollanen

  • Article
    | Open Access

    Long-range coherent spin-qubit transfer between semiconductor quantum dots requires understanding and control over associated errors. Here, the authors achieve high-fidelity coherent state transfer in a Si double quantum dot, underpinning the prospects of a large-scale quantum computer.

    • J. Yoneda
    • , W. Huang
    •  & A. S. Dzurak

  • Article
    | Open Access

    Physical principles underlying machine learning analysis of quantum gas microscopy data are not well understood. Here the authors develop a neural network based approach to classify image data in terms of multi-site correlation functions and reveal the role of fourth-order correlations in the Fermi-Hubbard model.

    • Cole Miles
    • , Annabelle Bohrdt
    •  & Eun-Ah Kim

  • Article
    | Open Access

    Accurate control of the spatial location and the emission wavelength of single photon emitters (SPEs) in van der Waals materials is a crucial yet challenging endeavour. Here, the authors use an electron beam to generate SPE ensembles in high purity synthetic hBN with enhanced spatial accuracy and emission reproducibility.

    • Clarisse Fournier
    • , Alexandre Plaud
    •  & Aymeric Delteil

  • Article
    | Open Access

    Tensor network simulations of lattice gauge theories may overcome the limitations of the Monte Carlo approach, but results have been limited to 1+1 and 2+1 dimensions so far. Here, the authors report a tree-tensor-based numerical study of a 3+1d truncated U(1) lattice gauge theory with fermionic matter.

    • Giuseppe Magnifico
    • , Timo Felser
    •  & Simone Montangero

  • Article
    | Open Access

    Control of quantum emitters is needed in order to enable many applications. Here, the authors demonstrate enhancement and dynamical control of the Purcell emission from erbium ions doped in a nanoparticle within a fiber-based microcavity.

    • Bernardo Casabone
    • , Chetan Deshmukh
    •  & Hugues de Riedmatten

  • Article
    | Open Access

    The use of optically addressable spins to control dark electron-spins is promising for multi-qubit platforms; however, control over darks spins has remained challenging. Here, the authors realize entanglement between individual dark spins associated with substitutional nitrogen defects in diamond.

    • M. J. Degen
    • , S. J. H. Loenen
    •  & T. H. Taminiau

  • Article
    | Open Access

    Multi-donor molecules in Si provide a promising qubit platform, offering advantages over single donor qubits in terms of performance and fabrication. Here, the authors report a single qubit gate and long coherence times in a P donor molecule qubit in natural Si patterned by scanning tunneling microscope hydrogen lithography.

    • Lukas Fricke
    • , Samuel J. Hile
    •  & Michelle Y. Simmons

  • Article
    | Open Access

    Optically detected magnetic resonance of defect spins typically relies on Stokes excitation, in which the excitation energy is larger than that of the emitted photon. Here, the authors use the opposite regime of anti-Stokes excitation to detect Si vacancy spins in SiC, with a threefold improvement in signal contrast.

    • Jun-Feng Wang
    • , Fei-Fei Yan
    •  & Guang-Can Guo

  • Article
    | Open Access

    Multielectron quantum dots offer a promising platform for high-performance spin qubits; however, previous demonstrations have been limited to single-qubit operation. Here, the authors report a universal gate set and two-qubit Bell state tomography in a high-occupancy double quantum dot in silicon.

    • Ross C. C. Leon
    • , Chih Hwan Yang
    •  & Andrew S. Dzurak

  • Article
    | Open Access

    Non-Abelian statistics plays a crucial role towards realizing topological quantum computation. Here, the authors discover new types of non-Abelian three-loop braiding statistics that can only be realized in 3D interacting fermionic systems.

    • Jing-Ren Zhou
    • , Qing-Rui Wang
    •  & Zheng-Cheng Gu

  • Article
    | Open Access

    Rectenna, which consist of a microscale antenna, combined with a rectifying diode, have great potential in energy harvesting, however, achieving high responsivity and low resistance is extremely difficult. Here, the authors demonstrate a metal-insulator-insulator metal diode which overcomes these limitations.

    • Amina Belkadi
    • , Ayendra Weerakkody
    •  & Garret Moddel

  • Article
    | Open Access

    Device-independent quantum key distribution aims at the ultimate quantum-based unconditional security, but current protocols’ rates are quite far from anything practical. The authors’ protocol narrows this gap by using two randomly chosen key generating bases instead of one.

    • René Schwonnek
    • , Koon Tong Goh
    •  & Charles C.-W. Lim

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