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News & Views |
Microwave–optical transducer efficiency boost
A record-breaking microwave-to-optics conversion efficiency of 82% over a 1 MHz bandwidth for low photon numbers is achieved by using a gas of Rydberg atoms, paving the way towards applications in quantum technologies.
- Jacob P. Covey
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Article |
Room-temperature superfluorescence in hybrid perovskites and its origins
Superfluorescence—the collective emission of fluorescent light—is observed at temperatures up to 330 K in lead halide perovskite thin films. This finding suggests an intrinsic mechanism for protecting the electronic coherence in these materials.
- Melike Biliroglu
- , Gamze Findik
- & Kenan Gundogdu
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Article |
Cavity-enhanced linear dichroism in a van der Waals antiferromagnet
Researchers use spin-charge coupling and FePS3 crystals to induce large in-plane optical anisotropy and near-unity linear dichroism in the visible–near-infrared range.
- Huiqin Zhang
- , Zhuoliang Ni
- & Deep Jariwala
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Article |
Electrically controllable chirality in a nanophotonic interface with a two-dimensional semiconductor
Researchers demonstrate electrically controllable chirality by exploiting doping-dependent valley polarization of excitonic states in monolayer tungsten diselenide.
- Robert Shreiner
- , Kai Hao
- & Alexander A. High
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News & Views |
Birefringence aids photonic lattice simulations
Harnessing birefringence in a photonic chip featuring an array of coupled waveguides brings new opportunities for investigating quantum effects such as bunching and antibunching.
- Hao Tang
- & Xian-Min Jin
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Review Article |
Progress on table-top isolated attosecond light sources
Recent progress of table-top isolated attosecond light sources is reviewed with a focus on the related technologies for high-average-flux and high-peak-intensity attosecond bursts of light. An outlook on its applications is also provided.
- Katsumi Midorikawa
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Article |
High-efficiency coherent microwave-to-optics conversion via off-resonant scattering
The demonstration of high-efficiency coherent microwave-to-optics conversion could push atomic transducers closer to practical applications in quantum technologies.
- Hai-Tao Tu
- , Kai-Yu Liao
- & Shi-Liang Zhu
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Article |
A look under the tunnelling barrier via attosecond-gated interferometry
Attosecond-gated interferometry is developed by combining sub-cycle temporal gating and extreme-ultraviolet interferometry. By measuring the electron’s relative phase and amplitude under a tunnelling barrier, the quantum nature of the electronic wavepacket is identified.
- Omer Kneller
- , Doron Azoury
- & Nirit Dudovich
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Article |
Topologically protected quantum entanglement emitters
A photonic anomalous Floquet insulator is emulated in a silicon photonic chip. Up to four-photon topologically protected entangled states are generated in a monolithically integrated emitter in ambient conditions through four-wave mixing on top of the edge modes of the insulator.
- Tianxiang Dai
- , Yutian Ao
- & Jianwei Wang
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Article |
Spatiotemporally controlled room-temperature exciton transport under dynamic strain
Researchers exploit Rayleigh waves and associated dynamic strains to control exciton transport in the weak coupling regime at room temperature. The findings may pave the way for new types of excitonic device for applications ranging from communications to energy.
- Kanak Datta
- , Zhengyang Lyu
- & Parag B. Deotare
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News & Views |
An optical oscilloscope for the mid-infrared
An off-the-shelf silicon image sensor can directly record few-cycle optical waveforms in the mid-infrared in a single shot by employing tunnelling ionization as a temporal gate.
- Mostafa Shalaby
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Article |
Twin-field quantum key distribution over 830-km fibre
Twin-field (TF) quantum key distribution (QKD) over a secure distance of 833.8 km is demonstrated even in the finite-size regime. To this end, an optimized four-phase TF-QKD protocol and a high-speed low-noise TF-QKD system are developed.
- Shuang Wang
- , Zhen-Qiang Yin
- & Zheng-Fu Han
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Article |
Third-harmonic Mie scattering from semiconductor nanohelices
Third-harmonic Mie scattering optical activity from suspensions of semiconductor (CdTe) nanostructured helices is observed, opening ways for chiroptical characterization of semiconductor and other chiral non-metallic particles in volumes potentially of the order of 10–17 m3.
- Lukas Ohnoutek
- , Ji-Young Kim
- & Ventsislav K. Valev
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Article
| Open AccessOptically reconfigurable quasi-phase-matching in silicon nitride microresonators
Photogalvanic effect in silicon nitride microresonators enables reconfigurable quasi-phase-matching for efficient and tunable second-harmonic generation.
- Edgars Nitiss
- , Jianqi Hu
- & Camille-Sophie Brès
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News & Views |
Probing attosecond phenomena in solids
A sub-cycle modulation in reflectivity is observed in bulk crystals subjected to intense laser fields. The effect provides a new way to probe attosecond dynamics in materials.
- Shambhu Ghimire
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Article
| Open AccessReal-space subfemtosecond imaging of quantum electronic coherences in molecules
By combining scanning tunnelling microscopy and attosecond technologies, the coherent electronic motion generated in molecules by carrier-envelope-phase-stable laser pulses is visualized at ångström-scale spatial resolution and subfemtosecond temporal resolution.
- M. Garg
- , A. Martin-Jimenez
- & K. Kern
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Article |
Attosecond electron motion control in dielectric
Light-field-induced electron dynamics in a silicon dioxide dielectric system are exploited to directly measure the attosecond relative electronic delay response in the dielectric system, potentially extending the speed of data processing and information encoding into the petahertz realm.
- Dandan Hui
- , Husain Alqattan
- & Mohammed Th. Hassan
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Article |
High-Q slow light and its localization in a photonic crystal microring
Researchers demonstrate a microring cavity with a photonic crystal on its inside edge, which enables a simultaneous high quality factor (1,000,000) and slow light (10 times slower than for conventional whispering gallery modes). Defect modes with a high quality factor (600,000) and high localizations (20 times smaller) are also enabled.
- Xiyuan Lu
- , Andrew McClung
- & Kartik Srinivasan
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Article |
Coherent control of ultrafast extreme ultraviolet transient absorption
Absorption lineshape of H2 is coherently controlled by using intense near-infrared laser pulses. Depending on the time delay between the near-infrared and extreme ultraviolet pulses, the profiles display a Lorentzian or an asymmetric Fano lineshape.
- Peng Peng
- , Yonghao Mi
- & D. M. Villeneuve
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Article |
Two-step absorption instead of two-photon absorption in 3D nanoprinting
As an alternative to high-resolution fabrication by two-photon absorption, researchers demonstrate a two-step absorption process that employs inexpensive light sources.
- Vincent Hahn
- , Tobias Messer
- & Martin Wegener
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Letter
| Open AccessDual-comb hyperspectral digital holography
Dual-comb digital holography based on an interferometer composed of two frequency combs of slightly different repetition frequencies and a lensless camera sensor allows highly frequency-multiplexed holography with high temporal coherence.
- Edoardo Vicentini
- , Zhenhai Wang
- & Nathalie Picqué
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Article
| Open AccessUltra-fast germanium photodiode with 3-dB bandwidth of 265 GHz
By sandwiching a germanium fin between complementary in situ-doped silicon layers, a waveguide-coupled germanium photodiode with a 3-dB bandwidth of 265 GHz, accompanied by high responsivity and low dark current, is realized.
- S. Lischke
- , A. Peczek
- & L. Zimmermann
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News & Views |
Quantum teleportation from light to motion
Quantum teleportation is demonstrated between light and the vibrations of a nanomechanical resonator, realizing a key capability for quantum computing.
- Glen I. Harris
- & Warwick P. Bowen
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Article |
A photonic integrated quantum secure communication system
Quantum photonic integrated circuits for a standalone quantum secure communication system are developed and packaged into pluggable interconnects. The system is interfaced with 100 Gb s–1 data encryptors and its performance is evaluated over 10 km to 50 km fibre links.
- Taofiq K. Paraïso
- , Thomas Roger
- & Andrew J. Shields
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Letter |
Optomechanical quantum teleportation
Quantum teleportation of a photonic qubit into mechanical modes of two silicon photonic crystal nanobeams is demonstrated. It allows to store and retrieve an arbitrary qubit state onto a dual-rail encoded long-lived optomechanical quantum memory.
- Niccolò Fiaschi
- , Bas Hensen
- & Simon Gröblacher
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News & Views |
Directly proving the bosonic nature of photons
A simple yet effective optical set-up, employing two controllable, indistinguishable photons, is proven to allow a direct measurement of the exchange phase due to the bosonic particle statistics.
- Rosario Lo Franco
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News & Views |
Photons walk on fractal graphs
Photon propagation through an array of coupled waveguides arranged in various fractal patterns serves as a useful ‘optical simulator’ for revealing insights into quantum transport in complex scenarios.
- Tamás Kiss
- & Igor Jex
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Article |
Ultra-coherent Fano laser based on a bound state in the continuum
Quantum noise is suppressed by a bound state in the continuum (BIC) approach, enabling a microlaser with narrow linewidth compared to other small lasers.
- Yi Yu
- , Aurimas Sakanas
- & Jesper Mørk
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Article |
Polaritonic nonlocality in light–matter interaction
Extreme electromagnetic field confinement in polaritonic systems is demonstrated. The tight fields can excite magnetoplasmons and result in nonlocal phenomena.
- Shima Rajabali
- , Erika Cortese
- & Giacomo Scalari
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Article |
High-precision digital terahertz phase manipulation within a multichannel field perturbation coding chip
A terahertz phase modulator based on the switchable perturbation resonance in two-dimensional electron gas is demonstrated. Phase manipulation with precision ranging from 2° to 5° is obtained at frequencies in the range from 0.26 to 0.27 THz.
- Hongxin Zeng
- , Huajie Liang
- & Daniel M. Mittleman
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Article |
Slow carrier relaxation in tin-based perovskite nanocrystals
Tin-based perovskite nanocrystals with slower than usual relaxation dynamics holds promise for superior lead-free perovskite optoelectronic devices.
- Linjie Dai
- , Zeyu Deng
- & Neil C. Greenham
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Article |
Nanoscale atomic suspended waveguides for improved vapour coherence times and optical frequency referencing
A hybrid photonic–atomic device based on the integration of tapered nanoscale and mechanically suspended waveguides with hot vapour is reported, demonstrating a drastic reduction in absorption linewidth and improved vapour coherence time.
- Roy Zektzer
- , Noa Mazurski
- & Uriel levy
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Review Article |
Advances in Brillouin–Mandelstam light-scattering spectroscopy
Nearly 100 years after the prediction of Brillouin light-scattering spectroscopy, or Brillouin–Mandelstam light-scattering spectroscopy, the effect has proved itself a powerful tool for decades. Now its application to probing confined acoustic phonons, phononic metamaterials and magnons is reviewed.
- Fariborz Kargar
- & Alexander A. Balandin
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Article |
Quantum transport in fractal networks
Quantum transport in fractal networks is experimentally investigated by performing continuous-time quantum walks in fractal photonic lattices. Contrarily to classical fractals, anomalous transport governed solely by the fractal dimension is observed.
- Xiao-Yun Xu
- , Xiao-Wei Wang
- & Xian-Min Jin
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News & Views |
Long-distance quantum key distribution gets real
A ‘twin-field’ repeater-less protocol has enabled an experimental demonstration of secure quantum key distribution over a 511-km long-haul optical fibre link.
- Charles C.-W. Lim
- & Chao Wang
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Article |
Complete characterization of sub-Coulomb-barrier tunnelling with phase-of-phase attoclock
Electron non-stationary tunnelling dynamics is probed by the attoclock with the two-colour phase-of-phase photoelectron spectroscopy. Contrary to the case of static tunnelling, angle-to-time mapping in attoclock is found to be not angularly uniform.
- Meng Han
- , Peipei Ge
- & Yunquan Liu
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Article |
Stable and low-photovoltage-loss perovskite solar cells by multifunctional passivation
The use of a dimensionally graded 2D perovskite interface and passivation results in perovskite solar cells with very low photovoltage loss.
- Guang Yang
- , Zhiwei Ren
- & Gang Li
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Article |
Second-harmonic generation and the conservation of spatiotemporal orbital angular momentum of light
The second-harmonic spatiotemporal orbital angular momentum of an optical pulse and its space–time topological charge conservation during frequency doubling are experimentally observed, opening opportunities for nonlinear conversion and scaling of photons carrying spatiotemporal orbital angular momentum.
- Guan Gui
- , Nathan J. Brooks
- & Chen-Ting Liao
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Correspondence |
Exaggerated sensitivity in photodetectors with internal gain
- Simone Bianconi
- , Lincoln J. Lauhon
- & Hooman Mohseni
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Letter |
Twin-field quantum key distribution over a 511 km optical fibre linking two distant metropolitan areas
A field test of twin-field quantum key distribution was implemented through a 511 km optical fibre. To this end, precise wavelength control of remote independent laser sources and fast time- and phase-compensation systems are developed.
- Jiu-Peng Chen
- , Chi Zhang
- & Jian-Wei Pan
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Letter |
High-temperature superfluorescence in methyl ammonium lead iodide
A collective coherent quantum many-body phase, namely superfluorescence, is observed in CH3NH3PbI3 at 78 K. The excitation fluence dependence of the spectroscopic features and the population kinetics confirm all its well-known characteristics.
- Gamze Findik
- , Melike Biliroglu
- & Kenan Gundogdu
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Letter
| Open AccessCoexistence of dynamical delocalization and spectral localization through stochastic dissipation
Experimental and theoretical results of wave propagation in a disordered system with non-Hermitian disorder are presented, showing that wave spreading occurs in the parameter regime where all eigenstates are expected to be localized.
- Sebastian Weidemann
- , Mark Kremer
- & Alexander Szameit
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News & Views |
Chameleon graphene surfaces
The unique optical properties of graphene were combined with lithium-ion battery technology to produce multispectral optical devices, with colour-changing capabilities.
- Andrea C. Ferrari
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Article |
Room-temperature polaritonic non-Hermitian system with single microcavity
Researchers coupled exciton–polariton modes to one another in a six-fold symmetric microcavity with loss manipulation and observed room-temperature polaritonic parity-time-reversal symmetry.
- Hyun Gyu Song
- , Minho Choi
- & Yong-Hoon Cho
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Article |
600-km repeater-like quantum communications with dual-band stabilization
Twin-field quantum key distribution over 600 km is demonstrated. The key ingredient for success is the dual-band phase stabilization that dramatically reduce the phase fluctuations on optical fibre by more than four orders of magnitude.
- Mirko Pittaluga
- , Mariella Minder
- & Andrew J. Shields
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Letter |
Direct observation of the particle exchange phase of photons
An interferometric technique is developed to measure the particle exchange phase of indistinguishable photons. The exchange phase obtained is (−0.04 ± 0.07) radians, which clearly demonstrates the symmetric nature of the two-photon wave functions.
- Konrad Tschernig
- , Chris Müller
- & Armando Perez-Leija
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Review Article |
Prospects for metal halide perovskite-based tandem solar cells
A discussion of the evolution, present status and future outlook for tandem solar cells employing perovskite materials.
- Rui Wang
- , Tianyi Huang
- & Yang Yang
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Article |
Generation and measurement of intense few-femtosecond superradiant extreme-ultraviolet free-electron laser pulses
By amplifying a soliton in a multistage cascade, few-femtosecond extreme-ultraviolet free-electron laser pulses are achieved.
- Najmeh S. Mirian
- , Michele Di Fraia
- & Luca Giannessi
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