Quantum

Featured articles

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  Room-temperature strong coupling in a single-photon emitter-metasurface system

  Interfacing single-photon emitters (SPEs) with high-finesse cavities can prevent decoherence processes, especially at elevated temperature, but its implementation remains challenging. Here, the authors report room-temperature strong coupling of SPEs in hexagonal boron nitride with a dielectric cavity based on bound states in the continuum, showing a Rabi splitting of ~ 4 meV.

  • T. Thu Ha Do
  • Milad Nonahal
  • Son Tung Ha

  ArticleOpen Access13 Mar 2024 Nature Communications
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  Optically addressable spin defects coupled to bound states in the continuum metasurfaces

  Previous research reported enhanced emission from spin defects in hBN by coupling to optical resonators; however, this approach has limited scalability. Here the authors use a monolithic metasurface featuring quasi bound states fabricated from hBN to enhance photoemission and optical spin-readout efficiency of defects in the same material.

  • Luca Sortino
  • Angus Gale
  • Andreas Tittl

  ArticleOpen Access5 Mar 2024 Nature Communications
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  Coherent charge oscillations in a bilayer graphene double quantum dot

  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

  ArticleOpen Access30 Nov 2023 Nature Communications
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  Quantum bath suppression in a superconducting circuit by immersion cooling

  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

  ArticleOpen Access14 Jun 2023 Nature Communications
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  Evaluating the evidence for exponential quantum advantage in ground-state quantum chemistry

  The extent of problems in quantum chemistry for which quantum algorithms could provide a speedup is still unclear, as well as the kind of speedup one should expect. Here, the authors look at the problem of ground state energy estimation, and gather theoretical and numerical evidence for the fact that an exponential quantum advantage is unlikely for generic problems of interest.

  • Seunghoon Lee
  • Joonho Lee
  • Garnet Kin-Lic Chan

  ArticleOpen Access7 Apr 2023 Nature Communications
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  Quantum machine learning beyond kernel methods

  Comparing the capabilities of different quantum machine learning protocols is difficult. Here, the authors show that different learning models based on parametrized quantum circuits can all be seen as quantum linear models, thus driving general conclusions on their resource requirements and capabilities.

  • Sofiene Jerbi
  • Lukas J. Fiderer
  • Vedran Dunjko

  ArticleOpen Access31 Jan 2023 Nature Communications
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  A high-fidelity quantum matter-link between ion-trap microchip modules

  A possible route to scalability of trapped-ion-based quantum computing platforms is to connect multiple modules where ions can be shuttled across different registers. Here, the authors demonstrate fast and low-loss transfer of trapped ions between two microchip modules.

  • M. Akhtar
  • F. Bonus
  • W. K. Hensinger

  ArticleOpen Access8 Feb 2023 Nature Communications
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  Fusion-based quantum computation

  Fusion gates are common operations in photonic quantum information platforms, where they are employed to create entanglement. Here, the authors propose a quantum computation scheme where the same measurements used to generate entanglement can also be used to achieve fault-tolerance leading to an increased tolerance to errors.

  • Sara Bartolucci
  • Patrick Birchall
  • Chris Sparrow

  ArticleOpen Access17 Feb 2023 Nature Communications
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  Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime

  Light interaction with atoms depends on the strength of the light-matter coupling and the energy splitting of the modes involved. Here the authors study of quantum Rabi dynamics in a deep strong coupling regime by using a cloud of cold rubidium atoms.

  • Johannes Koch
  • Geram R. Hunanyan
  • Martin Weitz

  ArticleOpen Access20 Feb 2023 Nature Communications
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  Quantum enhanced radio detection and ranging with solid spins

  Quantum sensors based on NV centers in diamond are well established, however the sensitivity of detection of high-frequency radio signals has been limited. Here the authors use nanoscale field-focusing to enhance sensitivity and demonstrate ranging for GHz radio signals in an interferometer set-up.

  • Xiang-Dong Chen
  • En-Hui Wang
  • Fang-Wen Sun

  ArticleOpen Access9 Mar 2023 Nature Communications
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  High-fidelity qutrit entangling gates for superconducting circuits

  Qutrits, or quantum three-level systems, can provide advantages over qubits in certain quantum information applications, and high-fidelity single-qutrit gates have been demonstrated. Goss et al. realize high-fidelity entangling gates between two superconducting qutrits that are universal for ternary computation.

  • Noah Goss
  • Alexis Morvan
  • Irfan Siddiqi

  ArticleOpen Access5 Dec 2022 Nature Communications
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  Cross-platform comparison of arbitrary quantum states

  Efficient protocols for comparing quantum states generated on different quantum computing platforms are becoming increasingly important. Zhu et al. demonstrate cross-platform verification using randomized measurements that allow for scaling to larger systems as compared to full quantum state tomography.

  • D. Zhu
  • Z. P. Cian
  • C. Monroe

  ArticleOpen Access4 Nov 2022 Nature Communications
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  High field magnetometry with hyperpolarized nuclear spins

  Quantum sensors based on NV centers in diamond find applications in high spatial resolution NMR spectroscopy, but their operation is typically limited to low fields. Sahin et al. demonstrate a high-field sensor based on nuclear spins in diamond, where NV centers play a supporting role in optical initialization.

  • Ozgur Sahin
  • Erica de Leon Sanchez
  • Ashok Ajoy

  ArticleOpen Access19 Sep 2022 Nature Communications
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  Assembly and coherent control of a register of nuclear spin qubits

  In large qubit registers, long coherence times and individual qubit control are difficult to achieve at the same time. Here, the authors assemble a 2D register of qubits in an array of fermionic alkaline-earth atoms, where tailored pulses can be applied to subsets of individual qubits in parallel.

  • Katrina Barnes
  • Peter Battaglino
  • Michael Yarwood

  ArticleOpen Access19 May 2022 Nature Communications
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  Symmetries in quantum networks lead to no-go theorems for entanglement distribution and to verification techniques

  The analysis of correlations in quantum networks is a difficult problem in the general case, and have so far been limited to small examples. Here, the authors show how to use symmetries and the inflation technique to derive general network entanglement criteria and certification methods.

  • Kiara Hansenne
  • Zhen-Peng Xu
  • Otfried Gühne

  ArticleOpen Access25 Jan 2022 Nature Communications
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  Intrinsic and induced quantum quenches for enhancing qubit-based quantum noise spectroscopy

  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

  ArticleOpen Access11 Nov 2021 Nature Communications
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  Observation of the modification of quantum statistics of plasmonic systems

  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

  ArticleOpen Access27 Aug 2021 Nature Communications
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  Quantum gravitational decoherence from fluctuating minimal length and deformation parameter at the Planck scale

  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

  ArticleOpen Access22 Jul 2021 Nature Communications
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  Hamiltonian simulation algorithms for near-term quantum hardware

  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

  ArticleOpen Access17 Aug 2021 Nature Communications
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  Spin defects in hBN as promising temperature, pressure and magnetic field quantum sensors

  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

  ArticleOpen Access22 Jul 2021 Nature Communications
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  Lattice quantum electrodynamics in (3+1)-dimensions at finite density with tensor networks

  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

  ArticleOpen Access14 Jun 2021 Nature Communications
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  The XZZX surface code

  The surface code is a keystone in quantum error correction, but it does not generally perform well against structured noise and suffers from large overheads. Here, the authors demonstrate that a variant of it has better performance and requires fewer resources, without additional hardware demands.

  • J. Pablo Bonilla Ataides
  • David K. Tuckett
  • Benjamin J. Brown

  ArticleOpen Access12 Apr 2021 Nature Communications
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  Reducing the impact of radioactivity on quantum circuits in a deep-underground facility

  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

  ArticleOpen Access12 May 2021 Nature Communications
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  Power of data in quantum machine learning

  Expectations for quantum machine learning are high, but there is currently a lack of rigorous results on which scenarios would actually exhibit a quantum advantage. Here, the authors show how to tell, for a given dataset, whether a quantum model would give any prediction advantage over a classical one.

  • Hsin-Yuan Huang
  • Michael Broughton
  • Jarrod R. McClean

  ArticleOpen Access11 May 2021 Nature Communications
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  A generalized multipath delayed-choice experiment on a large-scale quantum nanophotonic chip

  Wave-particle duality and delayed choice are keys to our understanding of quantum mechanics. Here, leveraging the capabilities of silicon nanophotonics, the authors probe the extension of wave-particle duality from dual-path to multipath case.

  • Xiaojiong Chen
  • Yaohao Deng
  • Jianwei Wang

  ArticleOpen Access7 May 2021 Nature Communications
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  Floquet-enhanced spin swaps

  Information transfer between distant qubits suffers from spurious interactions and disorder. Here, the authors report up to an order of magnitude enhancement in the quality factor of a swap operation of eigenstates in a quantum dot chain, by using a periodic driving protocol inspired by discrete time crystals.

  • Haifeng Qiao
  • Yadav P. Kandel
  • John M. Nichol

  ArticleOpen Access9 Apr 2021 Nature Communications
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  Quantum measurement arrow of time and fluctuation relations for measuring spin of ultracold atoms

  Irreversibility in quantum measurements shares conceptual links with statistical and thermodynamical irreversibility. Here, the authors are able to operationally associate an "arrow of time” to quantum weak measurements, testing it experimentally on a cloud of ultracold atoms.

  • Maitreyi Jayaseelan
  • Sreenath K. Manikandan
  • Nicholas P. Bigelow

  ArticleOpen Access23 Mar 2021 Nature Communications
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  Experimental demonstration of quantum advantage for NP verification with limited information

  Most demonstrations of quantum advantages with optics rely on single photons, and are thus difficult to scale up. Here, the authors use coherent states to demonstrate a quantum advantage for the task of verifying the solution to a NP-complete problem when only partial information on the solution is available.

  • Federico Centrone
  • Niraj Kumar
  • Iordanis Kerenidis

  ArticleOpen Access8 Feb 2021 Nature Communications
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  Mixing indistinguishable systems leads to a quantum Gibbs paradox

  The Gibbs paradox stems from the entropy change upon mixing two gases. Here, by considering bosonic and fermionic statistics, the authors show that an observer unable to distinguish the particles’ spins assigns a greater entropy increase to the mixing process than is possible in classical physics.

  • Benjamin Yadin
  • Benjamin Morris
  • Gerardo Adesso

  ArticleOpen Access5 Mar 2021 Nature Communications
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  A complete hierarchy for the pure state marginal problem in quantum mechanics

  The quantum marginal problem interrogates the existence of a global pure quantum state with some given marginals. Here, the authors reformulate it as an optimisation problem, and specifically as the existence of a two-party separable state with additional semidefinite constraints.

  • Xiao-Dong Yu
  • Timo Simnacher
  • Otfried Gühne

  ArticleOpen Access12 Feb 2021 Nature Communications
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  Scaling advantage over path-integral Monte Carlo in quantum simulation of geometrically frustrated magnets

  Experimental demonstration of quantum speedup that scales with the system size is the goal of near-term quantum computing. Here, the authors demonstrate such scaling advantage for a D-Wave quantum annealer over analogous classical algorithms in simulations of frustrated quantum magnets.

  • Andrew D. King
  • Jack Raymond
  • Mohammad H. Amin

  ArticleOpen Access18 Feb 2021 Nature Communications