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As a pioneer in the research on ultra-high-quality dielectric microresonators and their applications in nonlinear optics, frequency metrology and laser science, Mikhail Gorodetsky is badly missed.

A position sensor is demonstrated that is capable of resolving the zero-point motion of a nanomechanical oscillator in the timescale of its thermal decoherence; it achieves an imprecision that is four orders of magnitude below that at the standard quantum limit and is used to feedback-cool the oscillator to a mean photon number of five.

When free electrons emit light, an entangled electron–photon state is created. Here measurements of the correlated multiparticle system have been used to produce non-classical photonic states.

Optically generated microwaves offer exceptionally low noise, crucial for radar and communications. Here, authors demonstrate a compact photonic chip-based interleaver multiplying pulse rates of mode-locked lasers to 14 GHz, significantly enhancing microwave power and reducing phase noise.

Copper-impurity-free Si₃N₄ photonic integrated circuits reduce thermal absorption and enable robust, deterministic soliton generation.

Frequency metrology lies at the heart of precision measurement. Here, authors establish a phasecoherent frequency link across microwave, optical, and free-electron domains. This bridges electromagnetic waves and electron matter waves, advancing ultrahigh-precision electron spectroscopy.

A turnkey regime for soliton microcombs is demonstrated, in which solitons are generated by switching on a co-integrated pump laser, eliminating the need for photonic and electronic control circuitry.

A scalable solution involving direct wafer-bonding of high-quality, epitaxially grown gallium phosphide to low-index substrates is introduced. The promise of this platform for integrated nonlinear photonics is demonstrated with low-threshold frequency comb generation, frequency-doubled combs and Raman lasing.

A turn-key-operable hybrid integrated Pockels laser based on an external distributed Bragg waveguide grating reflector fabricated in a wafer-scale thin-film lithium niobate on insulator platform is demonstrated, with a tuning efficiency of over 550 MHz V^–1, tuning rates reaching the exahertz per second, and a high output power of 15 mW.

Molecules of solitons provide insight into fundamental interactions between them and the underlying nonlinear system. The reported heteronuclear molecules, comprised of dissipative solitons with distinct frequencies, temporal widths, and energies enter the multistability regime and yield in interlocked frequency combs.

A cavity optomechanics model accounting for the intrinsic dynamics of the interaction between plasmons and molecular vibrations reveals a parametric amplification mechanism that may provide an explanation for features recently observed in nonlinear Raman spectroscopy experiments.

Phase-matching and quasi-phase-matching in periodically poled ferroelectrics ensure efficient harmonic generation, but only statically. Here, Billat et al. demonstrate all-optically reconfigurable second harmonic generation by inscribing a stable grating in CMOS-compatible nonlinear waveguides.

A room-temperature demonstration of optomechanical squeezing of light and measurement of mechanical motion approaching the Heisenberg limit using a phononic-engineered membrane-in-the-middle cavity with ultralow noise.

An optical parametric amplifier based on integrated photonic circuits fabricated using low-loss gallium phosphide-on-silicon dioxide demonstrates improved bandwidth and gain performance over state-of-the-art erbium-doped fibre amplifiers while maintaining a low noise figure.

An integrated electro-optic frequency comb that combines microwave integrated circuits with a photonic circuit based on lithium tantalate leads to broadband operation with low power requirements.

Thermal agitation of charge carriers, known as Johnson noise, is the dominant noise in electronic circuits. Now it has also been observed as a key noise source in integrated electro-optic photonic circuits, posing challenges for future applications.

Optomechanical lattices in one and two dimensions with exceptionally low disorder are realized, showing how the optomechanical interaction can be exploited for direct measurements of the Hamiltonian, beyond the tight-binding approximation.

It has long been known that the optical resonances of ultrahigh-Q whispering gallery mode resonators can split under the influence of particle scattering. Now scientists have exploited this splitting to accurately determine particle sizes.

A microphotonic astrocomb is demonstrated via temporal dissipative Kerr solitons in photonic-chip-based silicon nitride microresonators with a precision of 25 cm s^–1 (radial velocity equivalent), useful for Earth-like planet detection and cosmological research.

Coherent interconversion between microwave and optical frequencies is crucial for developing quantum networks. To this end, the authors integrate piezoelectric actuators on photonic integrated circuits, enabling bidirectional transduction mediated by high-overtone bulk acoustic resonances.

Electro-optical photonic integrated circuits based on lithium tantalate perform as well as current state-of-the-art ones using lithium niobate but the material has the advantage of existing commercial uses in consumer electronics, easing the problem of scalability.

Photonic circuits can allow light to be tightly confined on a chip. A clever experiment reveals how this process can be exploited to create optical forces that drive a nanoscale mechanical oscillator.

Significant efforts have been dedicated to understanding the mechanisms of decoherence in superconducting qubits. Here, using time-resolved error measurements, the authors link errors present in transmon qubits based on Nb electrodes to mechanical vibrations of a commonly used pulse tube cooler.

A fully hybrid integrated erbium-doped photonic integrated waveguide laser with wide tuning of 40 nm, side-mode suppression ratio of >70 dB and output power up to 17 mW is demonstrated, achieving not only footprint reduction but also the long-anticipated fibre-laser coherence.

Lithium niobate (LN) is difficult to process via dry etching. Here, authors demonstrate the fabrication of deeply etched, tightly confining, low loss LN photonic integrated circuits with losses 4 dB/m using diamond like carbon as a hard mask.

Kerr frequency combs are well suited for high-capacity data transmission with phase-sensitive modulation formats. This work demonstrates error-free transmission with data rates of up to 1.44 Tbit s⁻¹, spectral efficiencies of up to 6 bit s⁻¹ Hz⁻¹ and transmission distances of up to 300 km.

For microcomb-based radiofrequency filters pulse shapers are required, which increase the system cost, footprint, and complexity. Here, the authors bypass this need by exploiting versatile soliton states inherent in microresonator and achieve reconfigurable radiofrequency filters.

The researchers showcase a photonic-electronic FMCW LiDAR source composed of a micro-electronic based high-voltage arbitrary waveform generator, a photonic circuit-based tunable Vernier laser with piezoelectric actuators, and an erbium-doped waveguide amplifier.

Optical absorption and nonlinear index are important performance drivers in devices like microcombs. Here the authors use resonance-enhanced nonlinear spectroscopy to characterize absorption limits and nonlinear index for some integrated photonic materials.

Stable and tunable integrated lasers are fundamental building blocks for applications from spectroscopy to imaging and communication. Here the authors present a narrow linewidth hybrid photonic integrated laser with low frequency noise and fast linear wavelength tuning. They then provide an efficient FMCW LIDAR demonstration.

Optomechanical systems in which a high-quality optical resonator is coupled to a mechanical oscillator hold great promise for examining quantum effects in relatively large structures. As a step towards this, a silica microtoroid has now been cooled to the point that it has just 63 thermal quanta.

A frequency-tunable laser based on a hybrid silicon nitride and lithium niobate integrated photonic platform has a fast tuning rate and could be used for optical ranging applications.

The intrinsic random amplitude and phase modulation of 40 distinct lines of a microresonator frequency comb operated in the modulation instability regime are used to realize massively parallel random-modulation continuous-wave light detection and ranging, without requiring any electro-optical modulator or microwave synthesizer.

A silicon nitride microresonator is used for coherent phase modulation of a transmission electron microscope beam, with future applications in combining high-resolution microscopy with spectroscopy, holography and metrology.

Spectroscopy that combines the accuracy of a frequency comb with the ease of use of a tunable, external cavity diode laser is demonstrated, enabling precise dispersion measurements of microresonator modes.

Lithium niobate plays an important role in integrated photonics, but its widespread application requires a reliable solution. Here, the authors present a wafer-scale approach to LNOI integration via wafer bonding to silicon nitride PICs.

Superluminescent diodes, that provide a broadband spectrum are typically used in spectral domain coherence tomography. Here, the authors use chipscale silicon nitride resonators to generate soliton microcombs with a lower noise flor that could substitute the diode sources.

By using Si₃N₄ photonic integrated circuits on a silicon chip, a continuous-travelling-wave parametric amplifier is shown to yield a parametric gain exceeding both on-chip propagation loss as well as fibre–chip–fibre coupling losses.

Photonic integrated systems can be harnessed for fast and efficient optical telecommunication and metrology technologies. Here the authors develop a dual-soliton microcomb technique for massively parallel coherent laser ranging that requires only a single laser and a single photoreceiver.

Here, the authors demonstrate acousto-optic modulation of silicon nitride microring resonators using high-overtone bulk acoustic wave resonances, allowing modulation in the GHz range via acoustic waves. As an application, an optical isolator is demonstrated with 17 dB non-reciprocity.

Chip-based frequency combs promise many applications, but full integration requires the electrical pump source and the microresonator to be on the same chip. Here, the authors show such integration of a microcomb with < 100 GHz mode spacing without additional filtering cavities or on-chip heaters.

For widespread technological application of nonlinear photonic integrated circuits, ultralow optical losses and high fabrication throughput are required. Here, the authors present a CMOS fabrication technique that realizes integrate photonic microresonators on waver-level with mean quality factors exceeding 30 million and 1 dB/m optical losses.

A commercial titanium-doped lithium niobate phase modulator can be employed at temperatures as low as 800 mK for the electro-optical readout of a superconducting electromechanical circuit at 15 mK.

Achieving low decoherence is challenging in hybrid quantum systems. A superconducting-circuit-based optomechanical platform realizes millisecond-scale quantum state lifetime, which allows tracking of the free evolution of a squeezed mechanical state.

’Here the authors provide the demonstration of platicon comb generation in an integrated photonic chip using laser self-injection locking, They take advantage of platicons generation in normal GVD resonators, which significantly relaxes the material and geometry design restrictions