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| Open AccessRoom-temperature quantum emission from interface excitons in mixed-dimensional heterostructures
Interlayer excitons in 2D homo- and heterostructures have been intensively investigated due to their emerging optical properties. Here, the authors report the observation of interface excitons in 1D/2D carbon nanotube/WSe2 heterostructures, showing evidence of photon antibunching at room temperature.
- N. Fang
- , Y. R. Chang
- & Y. K. Kato
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Article
| Open AccessNonlocality activation in a photonic quantum network
Entangled local states can be made capable of violating Bell inequalities via nonlocality activation. Typical theoretical approaches require processing many copies of the original state and performing joint measurements on the ensemble. Here, instead, the authors experimentally demonstrate how to do so using a single copy of the state, broadcasting it to two spatially separated parties within a three-node network.
- Luis Villegas-Aguilar
- , Emanuele Polino
- & Geoff J. Pryde
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| Open AccessCavity-coupled telecom atomic source in silicon
T centers in silicon are promising candidates for quantum applications yet suffer from weak optical transitions. Here, by integrating with a silicon nanocavity, the authors demonstrate an enhancement of the photon emission rate for a single T center.
- Adam Johnston
- , Ulises Felix-Rendon
- & Songtao Chen
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| Open AccessRoom-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
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| Open AccessMode-multiplexing deep-strong light-matter coupling
The authors show an original approach to achieve strong light-matter interaction harnessing the coupling between plasmonic resonators and the Landau resonances of an underlying quantum well, demonstrating remarkably high coupling strengths.
- Joshua Mornhinweg
- , Laura Katharina Diebel
- & Christoph Lange
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| Open AccessStrong coupling between a microwave photon and a singlet-triplet qubit
By coupling a spin-qubit to a superconducting resonator, remote spin-entanglement becomes feasible. Here, Ungerer et al achieve strong coupling between a superconducting resonator and a singlet-triplet spin qubit, in an InAs nanowire.
- J. H. Ungerer
- , A. Pally
- & C. Schönenberger
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Article
| Open AccessHigh crosstalk suppression in InGaAs/InP single-photon avalanche diode arrays by carrier extraction structure
Opticalelectrical crosstalk, rather than optical crosstalk, is the primary issue in InGaAs/InP single-photon avalanche diode arrays. Here, Tang et al. propose a carrier-extraction structures to replace the trenching method, effectively reducing crosstalk and maintaining device reliability.
- Yongsheng Tang
- , Rui Wang
- & Meng Zhao
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Article
| Open AccessRealization of a crosstalk-avoided quantum network node using dual-type qubits of the same ion species
In ion-photon quantum network platforms, usually memory qubits and communication qubits are encoded in ions of different species. Here, instead, the authors show how to realise ion-photon entanglement within the same-species-dual-encoding scheme.
- L. Feng
- , Y.-Y. Huang
- & L.-M. Duan
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Article
| Open AccessCoherent light scattering from a telecom C-band quantum dot
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
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| Open AccessQuantum transport of high-dimensional spatial information with a nonlinear detector
High-dimensional quantum states allow for several advantages in quantum communication, but protocols such as teleportation require additional entangled photons as the dimension increases. Here, the authors show how to transport a high-dimensional quantum state from a bright coherent laser field to a single photon, using two entangled photons as the quantum channel.
- Bereneice Sephton
- , Adam Vallés
- & Andrew Forbes
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Article
| Open AccessFluorescence lifetime Hong-Ou-Mandel sensing
Standard techniques for Fluorescence Lifetime Imaging Microscopy are limited by the electronics to 100’s of picoseconds time resolution. Here, the authors show how to use two-photon interference to perform fluorescence lifetime sensing with picosecond-scale resolution.
- Ashley Lyons
- , Vytautas Zickus
- & Daniele Faccio
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Article
| Open AccessApparent nonlinear damping triggered by quantum fluctuations
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
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Article
| Open AccessFast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator
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
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Article
| Open AccessCloaking a qubit in a cavity
Circuit QED with strongly driven cavities is a powerful framework for quantum technologies, but often undesired effects on the qubit are introduced. Here, by using an external tone tailored to destructively interfere with the cavity field, the authors show how a transmon can be protected from these unwanted effects.
- Cristóbal Lledó
- , Rémy Dassonneville
- & Alexandre Blais
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| Open AccessMultiple channelling single-photon emission with scattering holography designed metasurfaces
Here the authors demonstrate on-chip single-photon source providing two emission channels with individual direction and polarization control of each channel by implementing a plasmonic holographic metasurface coupled to a Ge-vacancy nanodiamond.
- Danylo Komisar
- , Shailesh Kumar
- & Sergey I. Bozhevolnyi
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| Open AccessHigh-resolution single-photon imaging with physics-informed deep learning
High-resolution single-photon imaging is challenging due to complex hardware and noise disturbances. Here, the authors realise simultaneous single-photon denoising and super-resolution enhancement by physics-informed deep learning, with a physical multi-source noise model, two single-photon image datasets, and a deep transformer network.
- Liheng Bian
- , Haoze Song
- & Jun Zhang
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| Open AccessHigh-fidelity parametric beamsplitting with a parity-protected converter
The beamsplitter operation is a key component for quantum information processing, but implementations in superconducting circuit-QED usually introduce additional decoherence. Here, the authors exploit the symmetry within a SQUID, driven in a purely differential manner, to realise clean BS operations between two SC cavity modes.
- Yao Lu
- , Aniket Maiti
- & Robert J. Schoelkopf
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| Open AccessProbing the symmetry breaking of a light–matter system by an ancillary qubit
Hybrid quantum systems, such as superconducting qubits interacting with microwave photons in resonators, offer a rich platform for exploring fundamental physics. Wang et al. observe parity symmetry breaking in a probe qubit dispersively coupled to a resonator in the deep-strong coupling regime.
- Shuai-Peng Wang
- , Alessandro Ridolfo
- & J. Q. You
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| Open AccessCavity-enhanced single-shot readout of a quantum dot spin within 3 nanoseconds
Single-shot readout of optically active spin qubits is typically limited by low photon collection rates and measurement back-action. Here the authors overcome these limitations by using an open cavity approach for single-shot readout of a semiconductor quantum dot and demonstrate record readout time of a few ns.
- Nadia O. Antoniadis
- , Mark R. Hogg
- & Richard J. Warburton
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| Open AccessSingle-emitter quantum key distribution over 175 km of fibre with optimised finite key rates
Future single-photon-based quantum networks will require both reliable telecom single-photon sources and improvements in security analysis. Here, the authors show how to use quantum dots and difference frequency generation to perform long-distance QKD, also reducing secure key acquisition time thanks to improved analytical bounds.
- Christopher L. Morrison
- , Roberto G. Pousa
- & Alessandro Fedrizzi
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| Open AccessIntegrated quantum optical phase sensor in thin film lithium niobate
Squeezed light allows for quantum-enhanced, sub-shot-noise sensing, but its generation and use on a chip has so far remained elusive. Here, the authors fill this gap by demonstrating a thin-film lithium-niobate-based integrated quantum optical sensor, which beats shot-noise-limited SNR by ~ 4%.
- Hubert S. Stokowski
- , Timothy P. McKenna
- & Amir H. Safavi-Naeini
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Article
| Open AccessCoherent control of an ultrabright single spin in hexagonal boron nitride at room temperature
Optically active defects in hBN are promising for quantum sensing and information applications, however, coherent control of a single defect has not been achieved so far. By using an efficient method to produce arrays of defects in hBN, Guo et al. isolate a new carbon-related defect and show its coherent control.
- Nai-Jie Guo
- , Song Li
- & Guang-Can Guo
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| Open AccessQuantum microscopy of cells at the Heisenberg limit
The authors present a method for super-resolution quantum microscopy at the Heisenberg limit by using pairs of entangled photons with balanced pathlengths. They improve the spatial resolution, imaging speed, and contrast-to-noise ratio in practice while providing a theoretical interpretation of the super-resolution feature.
- Zhe He
- , Yide Zhang
- & Lihong V. Wang
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Article
| Open AccessIndividually addressable and spectrally programmable artificial atoms in silicon photonics
Realising integrated photonic circuits containing isolated telecommunications-wavelength artificial atom single photon emitters is an outstanding challenge in quantum technologies. Here, the authors demonstrate how to embed optically tunable G-centers in silicon-on-insulator integrated circuits.
- Mihika Prabhu
- , Carlos Errando-Herranz
- & Dirk Englund
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| Open AccessLong distance multiplexed quantum teleportation from a telecom photon to a solid-state qubit
The authors report functional and scalable long-distance quantum teleportation by teleporting a quantum state of light compatible with the telecom network onto a multimode quantum memory separated by 1km of optical fibre.
- Dario Lago-Rivera
- , Jelena V. Rakonjac
- & Hugues de Riedmatten
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Article
| Open AccessMultiphoton non-local quantum interference controlled by an undetected photon
Usually, observation of quantum interference in a non-local scenario (that is, when Alice’s measurement settings and Bob’s outcomes are space-like separated) relies on entanglement. Here, the authors experimentally show four-photon frustrated interference originating from the sources’ indistinguishability, without the need for entanglement.
- Kaiyi Qian
- , Kai Wang
- & Xiao-song Ma
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Article
| Open AccessMicrowave-to-optical transduction with erbium ions coupled to planar photonic and superconducting resonators
Interfacing superconducting quantum information processors with long-distance optical networks would require coherent interfacing between microwave and optical photons. Here, the authors show a chip-integrated microwave-to-optical transducer based on rare earth ion ensembles.
- Jake Rochman
- , Tian Xie
- & Andrei Faraon
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| Open AccessExperimental nonclassicality in a causal network without assuming freedom of choice
The triangle causal structure represents a departure from the usual Bell scenario, as it should allow to violate classical predictions without the need for external inputs setting the measurement bases. Here the authors realise this scenario using a photonic setup with three independent photon sources.
- Emanuele Polino
- , Davide Poderini
- & Fabio Sciarrino
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| Open AccessProgrammable frequency-bin quantum states in a nano-engineered silicon device
Frequency-bin qubits get the best of time-bin and dual-rail encodings, but require external modulators and pulse shapers to build arbitrary states. Here, instead, the authors work directly on-chip by controlling the interference of biphoton amplitudes generated in multiple, coherently-pumped ring resonators.
- Marco Clementi
- , Federico Andrea Sabattoli
- & Daniele Bajoni
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| Open AccessEntanglement-assisted quantum communication with simple measurements
Quantifying communication capabilities produced by sharing an entangled qubit pair is still a subject of debate. Here the authors show that there are communication tasks for which sharing an entangled pair gives higher power than sharing two classical bits, even when there is no entanglement in the measurements.
- Amélie Piveteau
- , Jef Pauwels
- & Armin Tavakoli
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| Open AccessWafer-scale nanofabrication of telecom single-photon emitters in silicon
The recently demonstrated approaches to fabrication of quantum emitters in silicon result in their random positioning, hindering applications in quantum photonic integrated circuits. Here the authors demonstrate controlled fabrication of telecom-wavelength quantum emitters in silicon wafers by focused ion beams.
- Michael Hollenbach
- , Nico Klingner
- & Georgy V. Astakhov
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| Open AccessUltra-low loss quantum photonic circuits integrated with single quantum emitters
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
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| Open AccessQuantum bath engineering of a high impedance microwave mode through quasiparticle tunneling
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
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| Open AccessOn-chip generation and dynamic piezo-optomechanical rotation of single photons
Hybrid quantum technologies synergistically combine different types of systems with complementary strengths. Here, the authors show monolithic integration and control of quantum dots and the emitted single photons in a surface acoustic wave-driven GaAs integrated quantum photonic circuit.
- Dominik D. Bühler
- , Matthias Weiß
- & Hubert J. Krenner
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| Open AccessObservation and control of Casimir effects in a sphere-plate-sphere system
Experimental studies of the Casimir effect have involved only interactions between two bodies so far. Here, the authors observe a micrometer-thick cantilever under the Casimir force exerted by microspheres from two sides simultaneously.
- Zhujing Xu
- , Peng Ju
- & Tongcang Li
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| Open AccessContinuous entanglement distribution over a transnational 248 km fiber link
Fibre-based entanglement distribution represents a key primitive for quantum applications such as QKD. Here, the authors demonstrate it across 248 km of deployed fiber, observing stable detected pair rates of 9 Hz for 110 h.
- Sebastian Philipp Neumann
- , Alexander Buchner
- & Rupert Ursin
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| Open AccessAn ultra-high gain single-photon transistor in the microwave regime
Successfully controlling an optical signal by a single gate photon would have great applicability for quantum networks and all-optical computing. Here, the authors realise a single-photon transistor in the microwave regime based on superconducting quantum circuits.
- Zhiling Wang
- , Zenghui Bao
- & Luming Duan
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| Open AccessEvidence of exciton-libron coupling in chirally adsorbed single molecules
Vibronic coupling in molecules plays an essential role in photophysics. Here, the authors observe optical fingerprints of the coupling between librational states and charged excited states in a single phthalocyanine molecule chirally absorbed on a surface.
- Jiří Doležal
- , Sofia Canola
- & Martin Švec
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| Open AccessQuantum and non-local effects offer over 40 dB noise resilience advantage towards quantum lidar
Sensitivity to noise is currently an obstacle to the use of quantum imaging techniques in real-world scenarios. Here, exploiting non-local cancellation of dispersion on time-frequency entangled photons, the authors show a 43dB improvement in resilience to noise for imaging protocols towards a quantum LiDAR.
- Phillip S. Blakey
- , Han Liu
- & Amr S. Helmy
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Article
| Open AccessHigh-fidelity photonic quantum logic gate based on near-optimal Rydberg single-photon source
The current main source of errors for photonic quantum logic gates is the imperfections of the single photons. Here, by using high-quality photons from Rydberg atoms, the authors are able to reach 99.7% entangling gate fidelity in a photonic CNOT gate.
- Shuai Shi
- , Biao Xu
- & Lin Li
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Article
| Open AccessRelativistic Bohmian trajectories of photons via weak measurements
Making Bohmian mechanics fully compatible with special relativity is still an ongoing challenge. Here, the authors make a further step in this direction by providing a way of constructing the relativistic Bohmian-type velocity field of single photons which is operationally based on weak measurements.
- Joshua Foo
- , Estelle Asmodelle
- & Timothy C. Ralph
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Article
| Open AccessPhotonic-circuited resonance fluorescence of single molecules with an ultrastable lifetime-limited transition
Single molecules can generate high-quality single photons for quantum technologies, but coupling to waveguides is difficult. Here, the authors show on-chip background-free resonance fluorescence generation and routing from single molecules with lifetime-limited transition and waveguide-aligned dipoles.
- Penglong Ren
- , Shangming Wei
- & Xue-Wen Chen
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Article
| Open AccessObservation of non-Hermitian topological Anderson insulator in quantum dynamics
The authors report an experimental observation of a non-Hermitian topological Anderson insulator using photonic quantum walks, revealing the competition between Anderson localization induced by random disorder and the non-Hermitian skin effect.
- Quan Lin
- , Tianyu Li
- & Peng Xue
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Article
| Open AccessExcited-state spin-resonance spectroscopy of V\({}_{{{{{{{{\rm{B}}}}}}}}}^{-}\) defect centers in hexagonal boron nitride
The negatively charged boron vacancy in hBN shows promise as a quantum sensor, but, until recently, the focus has been on its ground-state properties. Here, the authors report temperature-dependent spin-resonance optical spectroscopy of the orbital excited state.
- Nikhil Mathur
- , Arunabh Mukherjee
- & Gregory D. Fuchs
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Article
| Open AccessTailoring the superradiant and subradiant nature of two coherently coupled quantum emitters
Coherent control of quantum states of a system is important for quantum applications. Here the authors demonstrate manipulation of the degree of superposition of coherently coupled solid-state quantum emitters by using Stark shifts of their optical resonances.
- J.-B. Trebbia
- , Q. Deplano
- & B. Lounis
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Article
| Open AccessAnalogue cosmological particle creation in an ultracold quantum fluid of light
Under certain conditions light can act as a fluid like a Bose-Einstein condensate. Here the authors discuss an analogy of cosmological particle creation using such a quantum fluid of light.
- Jeff Steinhauer
- , Murad Abuzarli
- & Quentin Glorieux
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| Open AccessTowards actinide heterostructure synthesis and science
Controlling dimensionality and strain in actinide heterostructures will provide unrivaled opportunities for exploring novel quantum phenomena. We discuss the promises, challenges, and synthesis routes for these actinide-bearing heterostructures with complex electron correlations for functional and energy materials.
- Cody A. Dennett
- , Narayan Poudel
- & Krzysztof Gofryk
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| Open AccessNonlinear down-conversion in a single quantum dot
Tailoring the properties of single photon emission is a key requirement in photonic quantum technologies. Here, the authors demonstrate frequency and polarisation control of photons emitted from quantum dots through a laser-controlled down-conversion process.
- B. Jonas
- , D. Heinze
- & A. Zrenner
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| Open AccessOptical charge injection and coherent control of a quantum-dot spin-qubit emitting at telecom wavelengths
Long-distance quantum communication relies on interfacing qubits with telecom-band photons. Here the authors implement a solid-state spin-qubit based on a hole confined in a semiconductor quantum dot emitting photons in the telecom C-band.
- Łukasz Dusanowski
- , Cornelius Nawrath
- & Sven Höfling