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| Open AccessDemonstration of hypergraph-state quantum information processing
Usual multiqubit entangled states can be described using the graph formalism, where each edge connects only two qubits. Here, instead, the authors use a reprogrammable silicon photonics chip to showcase preparation, verification and processing of arbitrary four-qubit hypergraph states, where hyperedges describe entanglement within a subset of many qubits.
- Jieshan Huang
- , Xudong Li
- & Jianwei Wang
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Article
| Open AccessUniversal control of a bosonic mode via drive-activated native cubic interactions
Manipulating quantum information encoded in a bosonic mode requires sizeable and controllable nonlinearities, but superconducting devices’ strong nonlinearities are normally static. Here, the authors use a SNAIL to suppress static nonlinearities and use drive-dependent ones to reach universal control of a bosonic mode.
- Axel M. Eriksson
- , Théo Sépulcre
- & Simone Gasparinetti
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| Open AccessHermitian and non-Hermitian topology from photon-mediated interactions
Topological properties of a photonic environment are crucial to engineer robust photon-mediated interactions between quantum emitters. Here, the authors find general theorems on the topology of photon-mediated interactions, unveiling the phenomena of topological preservation and reversal.
- Federico Roccati
- , Miguel Bello
- & Angelo Carollo
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Article
| 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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Article
| Open AccessRealization of all-band-flat photonic lattices
Here the authors experimentally realized a systematic approach to synthesize arbitrary-size two-dimensional all-band-flat photonic lattices, which pave a route for investigating flat-band related physics such as slow-light, nonlinear breathing, and dispersionless image transmission.
- Jing Yang
- , Yuanzhen Li
- & Fei Gao
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Article
| Open AccessSwitchable unidirectional emissions from hydrogel gratings with integrated carbon quantum dots
Directional emission of photoluminescence is an emerging technique for light-emitting fields and nanophotonics. Here, the authors demonstrate a hydrogel grating with integrated quantum dots for switchable unidirectional emission tuning.
- Chenjie Dai
- , Shuai Wan
- & Zhongyang Li
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Article
| Open AccessDistributed quantum sensing of multiple phases with fewer photons
Enhanced sensitivity is a key parameter in quantum metrology. Here the authors demonstrate a distributed quantum phase sensing method that uses fewer photons than the number of parameters needed, and an enhanced quantum sensitivity is achieved.
- Dong-Hyun Kim
- , Seongjin Hong
- & Hyang-Tag Lim
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Article
| Open AccessDirect laser-written optomechanical membranes in fiber Fabry-Perot cavities
Authors showcase 3D direct laser writing to fabricate optically interfaced mechanical resonators. The membrane-type structures are placed inside fiber Fabry-Perot cavities to realize a miniaturized optical cavity. Further, the optomechanical properties reveal the coupling mechanism and a significant tuning of the mechanical resonator frequency.
- Lukas Tenbrake
- , Alexander Faßbender
- & Hannes Pfeifer
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Article
| 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 AccessNanoscale feedback control of six degrees of freedom of a near-sphere
Levitated nanoparticles are a new platform for exploring quantum mechanics at macroscopic scales. The authors realize feedback controls of all external degrees of freedom of a nanoparticle, with one translational degree in the quantum ground state.
- Mitsuyoshi Kamba
- , Ryoga Shimizu
- & Kiyotaka Aikawa
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Article
| Open AccessQuantum noise and its evasion in feedback oscillators
Feedback oscillators are a fundamental tool in science and engineering. Here, Loughlin and Sudhir provide a generalized Schawlow-Townes-like formula for quantum-limited feedback oscillators, thus giving a general model to study the fundamental output noise of these devices and techniques to reduce their noise further.
- Hudson A. Loughlin
- & Vivishek Sudhir
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Article
| Open AccessQuantum storage of entangled photons at telecom wavelengths in a crystal
Storage of photon entanglement at telecommunication wavelength is an important milestone for the development of the quantum internet. Here, the authors demonstrate storage and retrieval of entangled telecom photons—generated through SWFM in a silicon nitride microring resonator—in an Erbium doped crystal.
- Ming-Hao Jiang
- , Wenyi Xue
- & Xiao-Song Ma
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Article
| Open AccessAcoustic frequency atomic spin oscillator in the quantum regime
Realising a quantum-backaction-limited oscillator in the acoustic frequency range would have applications in sensing and metrology. Here, the authors reach this goal by demonstrating destructive interference between quantum back-action noise and shot noise down to sub-kHz range in a warm atomic vapor cell.
- Jun Jia
- , Valeriy Novikov
- & Eugene S. Polzik
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| Open AccessCompact all-fiber quantum-inspired LiDAR with over 100 dB noise rejection and single photon sensitivity
LiDARs exploiting quantum correlations provide enhancement in noise resilience and sensitivity, but high-power classical sources offer much higher operating distances. Here, the authors show how to exploit high power classical time-frequency correlations to keep the best of both worlds.
- Han Liu
- , Changhao Qin
- & Amr S. Helmy
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Article
| Open AccessMachine learning assisted quantum super-resolution microscopy
Quantum super-resolution techniques take advantage of the non-classical nature of the quantum emitters, but are time-consuming. Here, the authors present a machine learning-assisted approach for fast antibunching-based super-resolution imaging, with a 12-fold speed up over the conventional approach
- Zhaxylyk A. Kudyshev
- , Demid Sychev
- & Vladimir M. Shalaev
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Article
| Open AccessEnhancing quantum teleportation efficacy with noiseless linear amplification
Continuous-variable quantum networks are easier to implement than discrete-variable ones, but suffer from a lower teleportation fidelity. Here, the authors demonstrate a CV teleportation protocol exploiting heralded noiseless amplification to increase the fidelity, at the expense of probabilistic operation.
- Jie Zhao
- , Hao Jeng
- & Ping Koy Lam
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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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Article
| Open AccessElectronic transport driven by collective light-matter coupled states in a quantum device
Here the authors investigate the electronic transport in microcavity-coupled quantum detector with strong collective electronic resonances. Their findings present a way to optimize photodetectors operating in the ultra-strong light-matter coupling regime.
- Francesco Pisani
- , Djamal Gacemi
- & Yanko Todorov
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| Open AccessQuantum simulation of thermodynamics in an integrated quantum photonic processor
The emergence of relaxation in unitarily evolving systems can be seen as a paradox, but not once the distinction between local and global dynamics is considered. Here, the authors use photons in an integrated optical interferometer to show that, for a system evolving unitarily on a global level, single-mode measurements converge to those of a thermal state.
- F. H. B. Somhorst
- , R. van der Meer
- & J. J. Renema
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| Open AccessDemonstration of quantum-digital payments
There are different quantum algorithms developed for the security of current cryptographic concepts. Here the authors demonstrate a method to perform quantum-secured digital payments using unforgeable quantum cryptograms over an optical fiber link and verify the information-theoretic security.
- Peter Schiansky
- , Julia Kalb
- & Philip Walther
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Article
| Open AccessCoherent optical control of a superconducting microwave cavity via electro-optical dynamical back-action
Electro-optical interfaces are promising for quantum networks of superconducting circuits. Here the authors demonstrate a coherent optical control of a superconducting microwave resonator in the unity cooperativity regime of cavity electro-optics.
- Liu Qiu
- , Rishabh Sahu
- & Johannes M. Fink
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| Open AccessNon-Hermitian control between absorption and transparency in perfect zero-reflection magnonics
Absorption, transmission and reflection are three processes characterizing optical devices. Absorption allows for signal conversion and transmission is important for signal transfer, however, reflection is frequently detrimental to device performance. Here, Qian et al demonstrate a magnonic device with controllable absorption and transmission while maintain zero reflection.
- Jie Qian
- , C. H. Meng
- & C. -M. Hu
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Article
| 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 AccessUnique Huygens-Fresnel electromagnetic transportation of chiral Dirac wavelet in topological photonic crystal
Huygens-Fresnel features are useful for harnessing light in unique ways. Here the authors demonstrate a chiral light source that induces globally a counter energy flow in a topological photonics structure with Dirac-type frequency dispersion.
- Xing-Xiang Wang
- , Zhiwei Guo
- & Xiao Hu
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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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Article
| Open AccessEmission enhancement of erbium in a reverse nanofocusing waveguide
Emission enhancement and extraction from quantum emitters is a major challenge for photon sources in e.g. quantum photonic networks. Here the authors propose a broadband waveguide platform which allows to boost, extract, and guide quantum emission within integrated photonic networks.
- Nicholas A. Güsken
- , Ming Fu
- & Rupert F. Oulton
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Article
| Open AccessImplementing quantum dimensionality reduction for non-Markovian stochastic simulation
Quantum technologies allow memory advantages in simulating stochastic processes, but a demonstration of this for non-Markovian processes (where the advantage would be stronger) has been missing so far. Here the authors fill this gap analytically and experimentally, using a single qubit memory to model non-Markovian processes.
- Kang-Da Wu
- , Chengran Yang
- & Thomas J. Elliott
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Article
| 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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Article
| Open AccessCertification of non-classicality in all links of a photonic star network without assuming quantum mechanics
Full network nonlocality, which certifies nonclassical behaviour in all sources of quantum networks, has so far only been demonstrated in the simplest scenarios. Here, the authors reach a complete experimental demonstration in a complex network involving three-qubit joint measurements.
- Ning-Ning Wang
- , Alejandro Pozas-Kerstjens
- & Armin Tavakoli
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Article
| Open AccessDynamically crossing diabolic points while encircling exceptional curves: A programmable symmetric-asymmetric multimode switch
By exploiting unique properties of both diabolic and exceptional points in the spectrum of non-Hermitian systems, the authors propose an experimental scheme of a programmable multimode switch, which opens alternative routes for light manipulations.
- Ievgen I. Arkhipov
- , Adam Miranowicz
- & Franco Nori
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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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| Open AccessExperimental cheat-sensitive quantum weak coin flipping
Quantum-enhanced versions of weak coin flipping (a cryptographic primitive where two mistrustful parties agree on a random bit while favouring opposite outcomes) have been proposed in the past but never realised. Here, the authors fill this gap by improving on a previous proposal and implementing it with single photons in a fibre-based setup.
- Simon Neves
- , Verena Yacoub
- & Eleni Diamanti
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| Open AccessSub-1 Volt and high-bandwidth visible to near-infrared electro-optic modulators
Electro-optic modulators can be useful for imaging, sensing and information processing applications. Here the authors demonstrate an ultra-low drive voltage visible to near infrared range electro-optic modulator in the form of amplitude and phase modulation using thin-film lithium niobate.
- Dylan Renaud
- , Daniel Rimoli Assumpcao
- & Marko Loncar
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| 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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Article
| Open AccessToward incompatible quantum limits on multiparameter estimation
In quantum multiparameter estimation, achieving the best precision for each parameter is hindered by the Heisenberg principle. Here, the authors demonstrate how to mitigate this problem by using appropriate probe states.
- Binke Xia
- , Jingzheng Huang
- & Guihua Zeng
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Article
| Open AccessTwin-field quantum key distribution without optical frequency dissemination
Twin-field QKD should allow secure quantum communication with favourable rate-loss scaling, but requires interferometric implementations which are often impractical for long distances. Here, the authors show how to realise it without the need for closed interferometers.
- Lai Zhou
- , Jinping Lin
- & Zhiliang Yuan
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Article
| Open AccessField programmable spin arrays for scalable quantum repeaters
Applications of solid-state qubits in large-scale quantum networks are limited by power and density constraints associated with microwave driving. Here the authors propose a programmable architecture based on diamond color centers driven by electric or strain fields for reduced cross-talk and power consumption.
- Hanfeng Wang
- , Matthew E. Trusheim
- & Dirk R. Englund
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Article
| Open AccessProvably-secure quantum randomness expansion with uncharacterised homodyne detection
Quantum random number generators should ideally rely on few assumptions, have high enough generation rates, and be cost-effective and easy to operate. Here, the authors show an untrusted-homodyne-based MDI scheme that does not rely on i.i.d. assumption and is secure against quantum side information.
- Chao Wang
- , Ignatius William Primaatmaja
- & Charles Lim
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Article
| 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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Article
| Open AccessGiant spin ensembles in waveguide magnonics
‘Giant atom’ physics occurs when the size of the atomic system becomes comparable to the wavelength of the light it interacts with. For atoms, such a regime is impossible to reach, however, for artificial atomic systems such ‘giant atom’ physics can be explored. Here, Wang et al demonstrate giant spin ensembles, consisting of magnetic spheres coupled to a microwave waveguide.
- Zi-Qi Wang
- , Yi-Pu Wang
- & J. Q. You
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Article
| Open AccessAnti-Zeno purification of spin baths by quantum probe measurements
The existing paradigms of system-bath control typically assume that the bath state is unchanged. By using spin defects in diamond, Dasari et al. demonstrate a scheme for controlling the state of the nuclear spin bath via selective measurements of the central qubit as a way of extending the qubit coherence time.
- Durga Bhaktavatsala Rao Dasari
- , Sen Yang
- & Jörg Wrachtrup
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Article
| Open AccessQuantum capacities of transducers
A unified metric to assess the performances of quantum transducers, i.e., converters of quantum information between different physical systems - is still lacking. Here the authors propose quantum capacity as such metric, and use it to investigate the optimal designs of generic quantum transduction schemes.
- Chiao-Hsuan Wang
- , Fangxin Li
- & Liang Jiang
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Article
| Open AccessNon-classical correlations over 1250 modes between telecom photons and 979-nm photons stored in 171Yb3+:Y2SiO5
Multimode operation would greatly improve the performances of quantum repeaters. Here, the authors demonstrate a fixed-delay atomic frequency comb quantum memory, based on a Y2SiO5 crystal doped with Ytterbium ions, with a time-domain mode capacity of 1250 modes and a bandwidth of 100 MHz.
- M. Businger
- , L. Nicolas
- & Mikael Afzelius
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Article
| Open AccessFlexible learning of quantum states with generative query neural networks
The use of machine learning to characterise quantum states has been demonstrated, but usually training the algorithm using data from the same state one wants to characterise. Here, the authors show an algorithm that can learn all states that share structural similarities with the ones used for the training.
- Yan Zhu
- , Ya-Dong Wu
- & Giulio Chiribella
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Article
| Open AccessSynthetic five-wave mixing in an integrated microcavity for visible-telecom entanglement generation
High-order optical nonlinearities are a key tool in photonics and quantum optics, but their use is hindered by materials’ small intrinsic high-order susceptibility. Here, the authors show how to realize high-order nonlinear processes by combining intrinsic low-order ones in a microcavity.
- Jia-Qi Wang
- , Yuan-Hao Yang
- & C.-L. Zou