We introduce a process for the fabrication of high quality, spatially isolated nano-diamonds on iridium via microwave plasma assisted CVD-growth. perform spectroscopy single silicon-vacancy (SiV)-centres produced during growth nano-diamonds. The colour centres exhibit extraordinary narrow zero-phonon-lines down to 0.7 nm at room temperature. Single photon count rates up 4.8 Mcps saturation make these SiV-centres brightest diamond based sources date. measure first time fine structure...

We report on single electronic spins coupled to the motion of mechanical resonators by a novel mechanism based crystal strain. Our device consists single-crystal diamond cantilevers with embedded nitrogen-vacancy center spins. Using optically detected electron spin resonance, we determine unknown spin-strain coupling constants and demonstrate that our system resides well within resolved sideband regime. realize strengths exceeding 10 MHz under driving show has potential reach strong...

The burgeoning field of nanophotonics has grown to be a major research area, primarily because the ability control and manipulate single quantum systems (emitters) photons on demand. For many years studying nanophotonic phenomena was limited traditional semiconductors (including silicon GaAs) experiments were carried out predominantly at cryogenic temperatures. In last decade, however, diamond emerged as new contender study photonic nanoscale. Offering plethora emitters that are optically...

We study single silicon vacancy (SiV) centres in chemical vapour deposition (CVD) nanodiamonds on iridium as well an ensemble of SiV a high quality, low stress CVD diamond film by using temperature dependent luminescence spectroscopy the range 5-295 K. investigate detail fine structure zero-phonon-line (ZPL) centres. The ZPL transition is affected inhomogeneous homogeneous broadening and blue shifts about 20 cm-1 upon cooling from room to 5 employ excitation power g(2) measurements explore...

Single silicon vacancy (SiV) color centers in diamond have recently shown the ability for high brightness, narrow bandwidth, room temperature single photon emission. This work develops a model describing three level population dynamics of SiV nanocrystals on iridium surfaces including an intensity dependent de-shelving process. Furthermore, we investigate brightness and photostability find maximum rates 6.2 Mcps under continuous excitation. We collection efficiency fluorescence estimate...

The electronic spin of the nitrogen vacancy (NV) center in diamond forms an atomically sized, highly sensitive sensor for magnetic fields. To harness full potential individual NV centers sensing with high sensitivity and nanoscale spatial resolution, have to be incorporated into scanning probe structures enabling controlled close proximity sample surface. Here, we present optimized procedure fabricate single-crystal, all-diamond probes starting from commercially available show a efficient...

The nitrogen-vacancy (NV) center in diamond has an optically addressable, highly coherent spin. However, NV even high quality single-crystalline material is a very poor source of single photons: extraction out the high-index inefficient, emission photons represents just few per cent total emission, and decay time large. In principle, all three problems can be addressed with resonant microcavity. practice, it proved difficult to implement this concept: photonic engineering hinges on...

Diamond based quantum technology is a fast emerging field with both scientific and technological importance. With the growing knowledge experience concerning diamond systems, comes an increased demand for performance. Quantum optimal control (QOC) provides direct solution to number of existing challenges as well basis proposed future applications. Together swift review QOC strategies, sensing other relevant applications nitrogen-vacancy (NV) centers in diamond, we give necessary background...

We introduce an advanced material system for the production and spectroscopy of single silicon vacancy (SiV) color centers in diamond. use microwave plasma chemical vapor deposition to synthesize heteroepitaxial nanodiamonds approximately 160 nm lateral size with a thickness 75 nm. These oriented ``nanoislands'' combine enhanced fluorescence extraction from subwavelength-sized defined crystal orientation. The investigated SiV display narrow zero-phonon lines down 0.7 wavelength range...

We report on the production of nanodiamonds (NDs) with 70-80 nm size via bead assisted sonic disintegration (BASD) a polycrystalline chemical vapor deposition (CVD) film. The NDs display high crystalline quality as well intense narrowband (7 nm) room temperature luminescence at 738 due to in situ incorporated silicon vacancy (SiV) centers. fluorescence properties and cryogenic temperatures indicate that are, depending preparation, applicable single photon sources or labels.

Individual, luminescent point defects in solids so called color centers are atomic-sized quantum systems enabling sensing and imaging with nanoscale spatial resolution. In this overview, we introduce based on individual nitrogen vacancy (NV) diamond. We discuss two central challenges of the field: First, creation highly-coherent, shallow NV less than 10 nm below surface single-crystal Second, fabrication tip-like photonic nanostructures that enable efficient fluorescence collection can be...

We demonstrate a quantum key distribution (QKD) testbed for room temperature single photon sources based on defect centres in diamond. A BB84 protocol over short free-space transmission line is implemented. The performance of nitrogen-vacancy (NV) as well silicon-vacancy (SiV) evaluated and an extrapolation next-generation with enhanced efficiency discussed.

Abstract Powered by the mutual developments in instrumentation, materials and theoretical descriptions, sensing imaging capabilities of quantum emitters solids have significantly increased past two decades. Quantum solids, whose properties resemble those atoms ions, provide alternative ways to probing natural artificial nanoscopic systems with minimum disturbance ultimate spatial resolution. Among emerging emitters, nitrogen vacancy (NV) color center diamond is an outstanding example due its...

We demonstrate the fabrication of single-crystalline diamond nanopillars on a (111)-oriented chemical vapor deposited substrate. This crystal orientation offers optimal coupling nitrogen-vacancy (NV) center emission to nanopillar mode and is thus advantageous over previous approaches. characterize single native NV centers in these find one highest reported saturated fluorescence count rates crystalline excess 106 counts per second. show that our nano-fabrication procedure conserves...

We report the creation of a low-loss, broadband optical antenna giving highly directed output from coherent single spin in solid-state. The device, first solid-state realization dielectric antenna, is engineered for individual nitrogen vacancy (NV) electronic spins diamond. demonstrate directionality close to 10. photonic structure preserves high coherence crystal diamond (T2>100us). photon count rate approaches MHz facilitating efficient readout. thus key enabling technology quantum...

Providing high-quality, single-crystal diamond (SCD) with a large area is desirable for up-scaling quantum technology applications that rely on color centers in diamond. Growth methods aiming to increase the of SCD are an active research area. Native offer sensitive probe local crystal quality such novel materials e.g., via their reaction stress. In this work, we investigate individual native nitrogen-vacancy (NV) layers manufactured laterally overgrowing hole arrays heteroepitaxially grown...

We report on imaging of microwave (MW) magnetic fields using a magnetometer based the electron spin nitrogen vacancy (NV) center in diamond. quantitatively image field generated by high frequency (GHz) MW current with nanoscale resolution scanning probe technique. Together shot noise limited sensitivity 680 nT Hz−1/2 our room temperature experiments establish NV as versatile and performance tool for imaging, which furthermore offers polarization selectivity broadband capabilities. As first...

We investigate the arrival statistics of Stokes (S) and anti-Stokes (aS) Raman photons generated in thin diamond crystals. Strong quantum correlations between S aS signals are observed, which implies that two processes share same phonon; is, phonon excited process is consumed process. show intensity cross-correlation g(S,aS)(2)(0), describes simultaneous detection photons, increases steadily with decreasing laser power saturates at very low pump powers, implying number Stokes-induced...

We investigate native nitrogen vacancy (NV) and silicon (SiV) color centers in a commercially available, heteroepitaxial, wafer-sized, mm thick, single-crystal diamond. observe single, NV with density of roughly 1 per μm3 moderate coherence time (T2 = 5 μs) embedded an ensemble SiV centers. Using low temperature luminescence as probe, we prove the high crystalline quality diamond especially close to growth surface, consistent reduced dislocation density. ion implantation plasma etching,...

We design photonic crystal microcavities in diamond films for applications quantum information. Optimization of the cavity by "gentle confinement" yields a high quality factor Q>66000 and small mode volume V approximately 1.1( l/n)(3). In view experimental we consider influence material absorption on Q factors present simple interpretation framework one-dimensional model.

Twisted-bilayer graphene (tBLG) exhibits van Hove singularities in the density of states that can be tuned by changing twisting angle $\theta$. A $\theta$-defined tBLG has been produced and characterized with optical reflectivity resonance Raman scattering. The $\theta$-engineered response is shown to consistent persistent saddle-point excitons. Separate resonances Stokes anti-Stokes scattering components achieved due sharpness two-dimensional excitons, similar what previously observed for...