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Diamond anvils are widely used in high-pressure research to investigate matter under extreme conditions. Here, broadband spectroscopy is used to measure pressure-driven opacity of diamond anvils to 520 GPa, revealing bandgap narrowing and optical behavior that redefines the limits of high-pressure spectroscopy.

Current applications of NV centers in diamond as spin-photon interfaces for quantum networks are limited by low coherent photon emission. Here, the authors integrate a coherently controlled NV spin qubit with an open microcavity to achieve Purcell-enhanced emission and demonstrate spin-photon state generation.

Shock synthesis of diamond and even harder carbon polymorphs from graphite is of great interest for science and technology. Here, the authors present unprecedented in situmeasurements of the structural changes, showing ultrafast formation of diamond and, at higher pressures, evidence for a pure lonsdaleite structure.

Obtaining quantitative information on nanoscale magnetic structures is a challenge. Here, the authors apply scanning probe magnetometry based on a single nitrogen-vacancy defect in diamond to quantitatively map the stray magnetic field emitted by a vortex state in a ferromagnetic dot.

Using light to manipulate matter on scales smaller than its wavelength presents a major challenge. Here, the authors show that two-photon surface excitation of diamond surfaces etches a variety of nano-scale patterns, comprising evidence for carbon ejection via a highly localized photon interaction with the crystal bonds.

The accurate structure of the platelet defects in diamond is now resolved by transmission electron microscopy, and, out of all the proposed models, it agrees well with the zigzag atomic model.

Methods to increase nuclear spin polarization can enhance the sensitivity of magnetic resonance techniques however they are often limited to unfavourable conditions. Here, the authors achieve room temperature hyperpolarization of bulk ¹³C nuclear spins by exploiting the optical response of nitrogen vacancy centers in diamond crystals.

Quantum teleportation has found important applications in quantum technologies, but pushing it to macroscopic objects is challenging because of the fragility of quantum states. Here, the authors demonstrate teleportation of states from light beams to the vibrational states of a macroscopic diamond sample.

A nitrogen impurity in diamond—where two of the carbon atoms are replaced by a nitrogen atom and a vacant lattice site—is seen as a valuable qubit. The spin of an electron localized to the nitrogen-vacancy centre is commonly used for processing. Researchers now show that this electron spin state can be transferred to the nitrogen nuclear spin, where it can be stored until needed.

Repeated observations of quantum states inhibit coherent evolution through the Zeno effect, providing opportunities for controlling multi-qubit systems. Here the authors demonstrate that projecting joint observables of three spins in diamond creates quantum Zeno subspaces that suppress dephasing.

Tuning surface charge and polymer length enables PEG-grafted nanoparticles to assemble into cubic superlattices resembling ZnS, NaCl, CsCl, simple cubic and diamond, offering a programmable route to valence-free crystals.

Group-IV color centers in diamond show promise for spin-photon interfaces, but precise positioning and activation are challenging. Here the authors combine site-controlled ion implantation with laser annealing and in-situ photoluminescence monitoring to create and tune individual tin vacancy centers in diamond.

Development of diamond-based quantum and electronic technologies requires heterogeneous integration, which has remained challenging. This work realizes direct bonding of single crystal diamond membranes to a broad range of technology-relevant substrates while maintaining quantum coherence for hosted qubits.

Silicon-vacancy (SiV) centers in diamond are emerging as promising quantum emitters for various applications. Here, authors devised a novel pulsed annealing scheme that improves the conversion efficiency of SiV centers in diamond.

The progress in generating high static pressures in diamond anvil cells opens opportunities for studying novel materials with unusual properties. Here, the authors report a universal high-pressure diamond edge Raman scale up to 500 gigapascals, which does not require an additional pressure sensor.

Diamond is of interest for optical and electronic applications owing to its unique mechanical and optical properties. Here, Rath et al. demonstrate the use of small nanometre-sized beams etched from diamond thin films for integrated photonic circuits.

Nitrogen-vacancy colour centre defects in diamond are one possible host for qubits, but such an application requires a method for reading out the colour centre spin state. Here, the authors demonstrate a photoelectric readout technique of the magnetic resonances of these colour centres.

By implanting ¹¹⁷Sn, a fibre-packaged nanophotonic diamond waveguide with optically addressable hyperfine transitions separated by 452 MHz is demonstrated. This enables the formation of a spin-gated optical switch and achieving a waveguide-to-fibre extraction efficiency of 57%.

Vibrational relaxation dynamics associated with NV centers in diamond has been intensively studied, but with contrasting reports. Here, using ultrabroadband transition absorption and 2D electronic spectroscopy, the authors reveal longitudinal-optical-phonon driven excited-state relaxation of coupled NV centers.

The application of resonant electron spin ensembles to the study electronic systems can be limited in spatial resolution above the micrometre scale. Here, the authors use nitrogen vacancies to probe the paramagnetic background in diamond via spin resonance spectra dominated by single local spins.

Nuclear spins in diamond have applications in quantum technologies and NMR methods but their performance can be limited by relaxation processes that are difficult to characterise. Ajoy et al. develop a T₁ noise spectroscopy method to identify the dominant relaxation channel and propose a mitigation strategy.

Here Jeskeet al. show both theoretical and experimental evidence for stimulated emission from negatively charged nitrogen vacancy centres using light in the phonon sidebands around 700 nm, demonstrating its suitability as a laser medium.

X-ray diffraction measurements of solid carbon compressed to pressures of about two terapascals (approximately twenty million atmospheres) find that carbon retains a diamond structure even under these extreme conditions.

Nitrogen-vacancy centres in diamonds are promising sensors for magnetic and electric fields, but existing acquisition methods are not suitable for measuring time-varying fields. Here, the authors introduce an acquisition method that exploits Walsh control sequences to efficiently measure this fields.

The use of optically addressable spins to control dark electron-spins is promising for multi-qubit platforms; however, control over darks spins has remained challenging. Here, the authors realize entanglement between individual dark spins associated with substitutional nitrogen defects in diamond.

Hydrophobic condenser surfaces can improve power plant efficiency, but they suffer from poor durability. Here the authors developed a durable fluorinated diamond-like carbon coating that improved dropwise condensation and maintained hydrophobicity over three years of pure steam condensation on multiple metallic substrates.

Measurements of the melting point of diamond at pressures of around 10 million atm suggest it could be present in crystalline form in the interiors of giant planets. At even higher pressures and temperatures about 50,000 K, diamond melts to form an unexpectedly complex, polymer-like fluid phase.

An optical parametric oscillator in the telecom wavelength range is realized in a diamond system consisting of a ring resonator coupled to a diamond waveguide. Threshold powers as low as 20 mW are measured and up to 20 new wavelengths are generated from a single-frequency pump laser.

Coupling the spins of many nitrogen–vacancy centres in a trapped diamond to its orientation produces a spin-dependent torque and spin-cooling of the motion of the diamond.

Diamond Blackfan Anemia (DBA) is a congenital bone marrow failure syndrome that is associated with anemia. Here, the authors examine the role of Nemo-like kinase (NLK) in erythroid cells in the pathogenesis of DBA and as a potential target for therapy.

Nitrogen vacancy (NV) centres in diamond can be used for NMR spectroscopy, but increased sensitivity is needed to avoid long measurement times. Kehayias et al. present a nanostructured diamond grating with a high density of NV centres, enabling NMR spectroscopy of picoliter-volume solutions.