Featured
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Article |
Dynamics of soliton crystals in optical microresonators
A dissipative Kerr soliton crystal state is a temporally ordered regular ensemble of soliton pulses within a cavity. Chaotic driving of optical resonators enables the defect-free creation and dynamical characterization of these states.
- Maxim Karpov
- , Martin H. P. Pfeiffer
- & Tobias J. Kippenberg
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Letter |
Identification of spin, valley and moiré quasi-angular momentum of interlayer excitons
Stacked 2D materials can host excitons with distinct valley selection rules due to the spatial variation of the moiré pattern. The authors demonstrate this via optical spectroscopy, opening a route for control of optoelectronic devices.
- Chenhao Jin
- , Emma C. Regan
- & Feng Wang
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Letter |
Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor
Photonic Weyl points—topologically chiral singularity points in three-dimensional momentum space—have been realized in a homogeneous non-reciprocal material without a crystal lattice structure.
- Dongyang Wang
- , Biao Yang
- & Shuang Zhang
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Letter |
Vanishing carrier-envelope-phase-sensitive response in optical-field photoemission from plasmonic nanoantennas
The carrier-envelope-phase-sensitive component of field-driven photoemission at the tip of a nanostructure shows a dip with a sudden phase shift. This is a consequence of its nonlinear dependence on the tunnel ionization and is not limited to solids.
- P. D. Keathley
- , W. P. Putnam
- & F. X. Kärtner
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News & Views |
Two are better than one
Two-level quantum systems are routinely excited by resonant pump beams. Experiments now show resonant excitation through dichromatic, detuned pumps — providing a coherent control technique that will also aid single-photon emission from solid-state devices.
- Glenn S. Solomon
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Article |
Subcycle squeezing of light from a time flow perspective
A general theoretical picture regarding the generation and the detection of extremely short pulses of squeezed vacuum light is provided, allowing the treatment of arbitrary wavepackets of quantum light intrinsically in the time domain.
- Matthias Kizmann
- , Thiago Lucena de M. Guedes
- & Guido Burkard
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Article |
Experimental few-copy multipartite entanglement detection
A general scheme for a resource-efficient probabilistic detection of multipartite entanglement is demonstrated on six-partite cluster states.
- Valeria Saggio
- , Aleksandra Dimić
- & Borivoje Dakić
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Letter |
Continuous force and displacement measurement below the standard quantum limit
Strong quantum correlations in an ultracoherent optomechanical system are used to demonstrate a displacement sensitivity that is below the standard quantum limit.
- David Mason
- , Junxin Chen
- & Albert Schliesser
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Letter |
Deep-subwavelength features of photonic skyrmions in a confined electromagnetic field with orbital angular momentum
Magnetic textures known as skyrmions have gathered much attention in recent years. It is now shown that focused vector beams can also give rise to photonic skyrmion-like structures.
- Luping Du
- , Aiping Yang
- & Xiaocong Yuan
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Article |
Emergence of the geometric phase from quantum measurement back-action
Following a closed evolution in the Hilbert space, the state vector of a quantum system accumulates a geometric phase factor. A series of weak measurements reveal the origin of this in the back-action of any quantum measurement.
- Young-Wook Cho
- , Yosep Kim
- & Yoon-Ho Kim
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Letter |
Stable coherent terahertz synchrotron radiation from controlled relativistic electron bunches
A feedback loop based on chaos control theory permits the generation of stable and coherent terahertz radiation from relativistic electron bunches in synchrotron light sources.
- C. Evain
- , C. Szwaj
- & S. Bielawski
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Letter |
A primary radiation standard based on quantum nonlinear optics
Triggered by the fluctuations of the electromagnetic vacuum, parametric down-conversion offers a new primary radiation standard based on quantum nonlinear optics.
- Samuel Lemieux
- , Enno Giese
- & Robert W. Boyd
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Article |
Turning a molecule into a coherent two-level quantum system
A molecule placed in an optical microcavity behaves as a model two-level quantum system, as demonstrated via laser extinction and interaction with single photons.
- Daqing Wang
- , Hrishikesh Kelkar
- & Vahid Sandoghdar
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Article |
Chip-integrated visible–telecom entangled photon pair source for quantum communication
Efficient photon pair sources connecting visible and telecommunication spectral regions are essential for viable long-distance fibre optic quantum communication architectures. A nanophotonic device is presented that allows kilometre-scale time–energy entanglement as an application.
- Xiyuan Lu
- , Qing Li
- & Kartik Srinivasan
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Letter |
Leggett mode controlled by light pulses
There has latterly been a renewed interest in collective excitations in condensed matter systems. Now, spectroscopic evidence for the so-called Leggett mode is revealed in the superconductor MgB2.
- Flavio Giorgianni
- , Tommaso Cea
- & Lara Benfatto
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Letter |
Quantum interference in second-harmonic generation from monolayer WSe2
Quantum interference between electronic pathways is generally difficult to observe in solid-state systems. Such interference is, however, now characterized in the second-harmonic generation from transition metal dichalcogenides, even at room temperature.
- Kai-Qiang Lin
- , Sebastian Bange
- & John M. Lupton
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Letter |
Exchange-driven intravalley mixing of excitons in monolayer transition metal dichalcogenides
Two-dimensional electronic spectroscopy experiments and first-principles many-electron calculations demonstrate the quantum mixing of different exciton states in monolayer MoS2. This reveals the many-body effects and dynamics of exciton formation in 2D materials.
- Liang Guo
- , Meng Wu
- & Graham R. Fleming
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Measure for Measure |
As fast as it gets
Bart Verberck reflects on measuring the speed of light, its role in metrology, and special relativity.
- Bart Verberck
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Article |
Magneto-transport controlled by Landau polariton states
A polariton is a hybrid excitation resulting from strong light–matter coupling. The magneto-transport measurements have now revealed the crucial role played by its electronic component.
- Gian L. Paravicini-Bagliani
- , Felice Appugliese
- & Jérôme Faist
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Letter |
High-dimensional one-way quantum processing implemented on d-level cluster states
The creation and manipulation of large quantum states is necessary for quantum information processing tasks. Three-level, four-partite cluster states have now been created in the time and frequency domain of two photons on-chip.
- Christian Reimer
- , Stefania Sciara
- & Roberto Morandotti
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Review Article |
High-harmonic generation from solids
This Review surveys recent efforts at understanding and characterizing generation of high harmonics from solid-state materials.
- Shambhu Ghimire
- & David A. Reis
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Article |
Complete reconstruction of bound and unbound electronic wavefunctions in two-photon double ionization
Photoionization is one of the most important photophysical events. This process can now be characterized in a quantum-mechanically complete manner by use of polarization-controlled extreme-ultraviolet light derived from a free-electron laser
- P. A. Carpeggiani
- , E. V. Gryzlova
- & G. Sansone
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Letter |
Plasmonic dynamics measured with frequency-comb-referenced phase spectroscopy
By means of a novel referencing technique that is based on the high stability of frequency combs, broadband phase spectra from plasmonics rulers can now be used to measure dynamic motion of nanostructures with picometre resolution.
- Nguyen Duy Anh
- , Byung Jae Chun
- & Young-Jin Kim
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Letter |
Evidence for topological defects in a photoinduced phase transition
Three different ultrafast probes investigate a non-adiabatic phase transition and find substantial evidence of topological defects inhibiting the reformation of the equilibrium phase.
- Alfred Zong
- , Anshul Kogar
- & Nuh Gedik
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Letter |
Wavelength-scale errors in optical localization due to spin–orbit coupling of light
The spin–orbit coupling of light leads to systematic wavelength-scale errors in the measurement of the position of emitters of elliptically polarized light.
- G. Araneda
- , S. Walser
- & A. Rauschenbeutel
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Letter |
Driven-dissipative non-equilibrium Bose–Einstein condensation of less than ten photons
Non-equilibrium Bose–Einstein condensation of 7 ± 2 photons is observed in a sculpted dye-filled microcavity. The small number of particles allows the authors to access and characterize the non-equilibrium dynamics of the bosonic modes.
- Benjamin T. Walker
- , Lucas C. Flatten
- & Robert A. Nyman
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Editorial |
Topology reaches higher spheres
Topology is everywhere. Recent predictions for and realizations of higher-order topological insulators are a case in point.
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Article |
Topolectrical-circuit realization of topological corner modes
The realization of a two-dimensional quadrupole topological insulator—featuring gapless corner states but an otherwise insulating bulk and edge—establishes electrical circuits as a versatile platform for implementing topological band structures.
- Stefan Imhof
- , Christian Berger
- & Ronny Thomale
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Letter |
Superradiant emission from colour centres in diamond
Superradiance is reported from an ensemble of nitrogen–vacancy centres coupled to a microwave resonator in the fast cavity limit.
- Andreas Angerer
- , Kirill Streltsov
- & Johannes Majer
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Letter |
A passive photon–atom qubit swap operation
Demonstration of a passive swap gate between the states of a fibre-guided photonic qubit and a single atom.
- Orel Bechler
- , Adrien Borne
- & Barak Dayan
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Letter |
Enhanced high-harmonic generation from an all-dielectric metasurface
The demonstration of substantially enhanced high-harmonic emission from a silicon metasurface suggests a route towards novel photonic devices based on a combination of ultrafast strong-field physics and nanofabrication technology.
- Hanzhe Liu
- , Cheng Guo
- & David A. Reis
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Article |
Routing the emission of a near-surface light source by a magnetic field
The Kerr and Faraday effects enable routing of light in an applied magnetic field. Now a new class of magneto-optical phenomena is proposed and demonstrated in which light emission is controlled perpendicular to the external magnetic field.
- F. Spitzer
- , A. N. Poddubny
- & M. Bayer
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Letter |
Biexcitonic optical Stark effects in monolayer molybdenum diselenide
Light–matter interactions in monolayer MoSe2 can be dramatically modified by the interactions between the excitonic states, leading to a rich set of light-driven coherent phenomena.
- Chaw-Keong Yong
- , Jason Horng
- & Feng Wang
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Letter |
Reconstructing the topology of optical polarization knots
Knotted lines representing torus knot and figure-eight knot are produced in the polarization profile of optical beams, leading to a topological characterization of the structure of the polarization field.
- Hugo Larocque
- , Danica Sugic
- & Ebrahim Karimi
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Letter |
Acoustic Rabi oscillations between gravitational quantum states and impact on symmetron dark energy
A spectroscopic approach based on the Rabi resonance method is used to probe the quantum states of ultracold neutrons—and thus their interaction with the gravitational potential of the Earth.
- Gunther Cronenberg
- , Philippe Brax
- & Hartmut Abele
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Letter |
Maximal spontaneous photon emission and energy loss from free electrons
Calculating the amount of radiation that can ultimately be extracted from free electrons near an arbitrary material structure is a challenge. Now, an upper limit to the spontaneous photon emission of electrons is demonstrated, regardless of geometry.
- Yi Yang
- , Aviram Massuda
- & Marin Soljačić
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Article |
Measurements in two bases are sufficient for certifying high-dimensional entanglement
Certification of high-dimensional entanglement is required for improved quantum communication protocols, and is now shown to be achievable in an efficient manner by measuring quantum states twice in two different bases.
- Jessica Bavaresco
- , Natalia Herrera Valencia
- & Marcus Huber
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Letter |
Superlight inverse Doppler effect
The authors theoretically investigate a novel form of a Doppler effect in homogeneous systems with positive refractive index that occurs under certain conditions. It is suggested that this Doppler effect can be experimentally separated from other Doppler effects by using polaritons such as those found in graphene.
- Xihang Shi
- , Xiao Lin
- & Baile Zhang
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Letter |
Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
Optoelectronic experiments show that a monolayer of WTe2 is a material that simultaneously has topological electronic states and electron wavefunctions with a dipole in their Berry curvature.
- Su-Yang Xu
- , Qiong Ma
- & Pablo Jarillo-Herrero
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Article |
Constant-pressure sound waves in non-Hermitian disordered media
Perfect transmission of sound waves through a strongly disordered environment is demonstrated using a set of speakers that provide exactly the right input to counteract scattering by the disorder. These principles can also be applied to light.
- Etienne Rivet
- , Andre Brandstötter
- & Romain Fleury
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Letter |
Strong coupling between photons of two light fields mediated by one atom
By coupling photons in two distinguishable modes to separate transitions of a single atom, strong correlations between photons are created. The technique makes all-optical switching and sensing possible at the single-photon level.
- Christoph Hamsen
- , Karl Nicolas Tolazzi
- & Gerhard Rempe
Light emission based on nanophotonic vacuum forces
Grape balls of fire
Going into resonance