We demonstrate an all-optical thermometer based on ensemble of silicon-vacancy centers (SiVs) in diamond by utilizing the sensitivity zero-phonon line wavelength to temperature, Δλ/ΔT=0.0124(2) nm K–1 [6.8(1) GHz K–1]. Using SiVs bulk diamond, we achieve 70 mK precision at room temperature with a uncertainty σT=360 mK/Hz. Finally, use 200 nanodiamonds as local probes 521 mK/Hz and sub-Kelvin precision. These properties deviate less than 1% between nanodiamonds, enabling calibration-free...

Abstract Monolithic integration of quantum emitters in nanoscale plasmonic circuitry requires low-loss configurations capable confining light well below the diffraction limit. We demonstrated on-chip remote excitation nanodiamond-embedded single by modes dielectric ridges atop colloidal silver crystals. The nanodiamonds were produced to incorporate germanium-vacancy (GeV) centres, providing bright, spectrally narrow and stable single-photon sources suitable for highly integrated circuits....

Nanodiamonds (NDs) hosting optically active defects are an important technical material for applications in quantum sensing, biological imaging, and optics. The negatively charged silicon vacancy (SiV) defect is known to fluoresce molecular sized NDs (1 6 nm) its spectral properties depend on the quality of surrounding host lattice. This therefore a good probe investigate small NDs. Here we report unprecedented narrow optical transitions SiV colour centers hosted nanodiamonds produced using...

Nanoscale thermometry is paramount to study primary processes of heat transfer in solids and a subject hot debate cell biology. Here we report ultrafast temperature sensing using all-optical thermometry, exploiting synthetic nanodiamonds with silicon-vacancy (SiV) centers embedded at high concentration. Using multiparametric analysis photoluminescence (PL) these centers, have experimentally achieved an intrinsic noise floor about 13 mK Hz –1/2, which 1000-fold increase the readout speed...

Nanodiamonds (NDs) with color centers are excellent emitters for various bioimaging and quantum biosensing applications. In our work, we explore new applications of NDs silicon-vacancy (SiV) obtained by high-pressure high-temperature (HPHT) synthesis based on metal-catalyst-free growth. They coated a polypeptide biopolymer, which is essential efficient cellular uptake. The unique optical properties SiV their high photostability narrow emission in the near-infrared region. Our results...

Channelling single-photon emission in multiple well-defined directions and simultaneously controlling its polarization characteristics is highly desirable for numerous quantum technology applications. We show that this can be achieved by using emitters (QEs) nonradiatively coupled to surface plasmon polaritons (SPPs), which are scattered into outgoing free-propagating waves appropriately designed metasurfaces. The QE-coupled metasurface design based on the scattering holography approach with...

Superparamagnetic carbon-encapsulated iron carbide nanoparticles have been synthesized and tested for cytotoxicity.

The Si-${V}^{\ensuremath{-}}$ center in diamond has emerged as an excellent single-photon source with outstanding properties for photonics and quantum information processing. Here surface-treatment techniques enable researchers to obtain single centers bulklike spectral nanodiamonds. authors resolve the fine structure of individual low-strain nanodiamonds, formulate analytical strain model this center, experimentally find coefficients. They also explore potential bottom-up assembly complex...

Ultracompact chip-integrated single-photon sources of collimated beams with polarization-encoded states are crucial for integrated quantum technologies. However, most currently available rely on external bulky optical components to shape the polarization and phase front emitted photon beams. Efficient integration emitters beam shaping encoding functionalities remains so far elusive. Here, ultracompact linearly polarized vortex based emitter-coupled metasurfaces presented, which meticulously...

We demonstrate an important step toward on-chip integration of single-photon sources at room temperature. Excellent photon directionality is achieved with a hybrid metal-dielectric bullseye antenna, while back-excitation permitted by placement the emitter in subwavelength hole positioned its center. The unique design enables direct and very efficient front coupling emission either to low numerical aperture (NA) optics or directly optical fiber. To show versatility concept, we fabricate...

Nanophotonic quantum devices can significantly boost light–matter interaction, which is important for applications such as networks. Reaching a high interaction strength between an optical transition of spin system and single mode light essential step that demands precise control over all degrees freedom the coupling. While current have reached accuracy emitter positioning, placement process remains overall statistically, reducing device fabrication yield. Furthermore, not coupling be...

Understanding and mastering quantum electrodynamics phenomena is essential to the development of nanophotonics applications. While tailoring local vacuum field has been widely used tune luminescence rate directionality a emitter, its impact on their transition energies barely investigated exploited. Fluorescent defects in nanosized diamonds constitute an attractive nanophotonic platform investigate Lamb shift emitter embedded dielectric nanostructure with high refractive index. Using...

Hybrid quantum photonic systems connect classical photonics to the world and promise deliver efficient light-matter interfaces while leveraging advantages of both, quantum, subsystems. However, combining efficient, scalable solid-state with desirable optical spin properties remains a formidable challenge. In particular, access individual states coherent mapping photons unsolved for hybrid systems. this paper, we demonstrate all-optical initialization readout electron negatively charged...

Temperature sensors based on the GeV color center in diamond are gaining considerable attention both scientific and industrial fields. For widespread adoption, however, these need a design that is as simple cost‐effective possible. The original sensor relies measuring spectral characteristics of zero‐phonon line. Recently, modified approach introduced, which involves splitting emission with dichroic mirror determining temperature ratio two resulting signals. In this analysis, detailed...

Abstract Striving for nanometer-sized solid-state single-photon sources, we investigate atom-like quantum emitters based on single germanium-vacancy (GeV) centers isolated in crystalline nanodiamonds (NDs). Cryogenic characterization indicated symmetry-protected and bright (>10 6 counts/s with off-resonance excitation) zero-phonon optical transitions up to 6-fold enhancement energy splitting of their ground states as compared that found GeV bulk diamonds (i.e. 870 GHz highly strained NDs...

Coherent quantum systems are a key resource for emerging technology. Solid-state spin of particular importance compact and scalable devices. However, interaction with the solid-state host degrades coherence properties. The negatively charged silicon vacancy center in diamond is such an example. While spectral properties outstanding, optical protected by defects symmetry, susceptible to rapid orbital relaxation limiting dephasing time. A prolongation time therefore utmost urgency has been...

Abstract Large-scale quantum communication networks require repeaters due to the signal attenuation in optical fibers. Ideal repeater nodes efficiently link a memory with photons serving as flying qubits. Color centers diamond, particularly negatively charged silicon vacancy center, are promising candidates establish such nodes. Inefficient connection between color center’s spin fiber is major obstacle, that could be resolved by utilizing resonators. Here, we couple individual incorporated...

Experimental evidence of the existence polymerized tetragonal (T) phase ${\mathrm{C}}_{60}$ as a stable high-pressure one is presented. Using different p,T paths high-pressure--high-temperature treatment, T was obtained product conversions monomeric fcc and two phases (including rhombohedral one) at 2.2 GPa 873 K. The dramatic differences in rates phase-T formation from states system testified to difference mechanisms formation. x-ray-diffraction pattern, IR, Raman spectra almost pure are

Abstract Hybrid quantum photonics combines classical with emitters in a postprocessing step. It facilitates to link ideal light sources optimized photonic platforms. Optical cavities enable harness the Purcell-effect boosting device efficiency. Here, we postprocess free-standing, crossed-waveguide crystal cavity based on Si 3 N 4 SiV − center nanodiamonds. We develop routine that optimizes overlap electric field utilizing atomic force microscope (AFM) nanomanipulation attain control of...

Germanium vacancy (GeV) centers in diamonds constitute a promising platform for single-photon sources to be used quantum information technologies. Emission from these color can enhanced by utilizing cavity that is resonant at the peak emission wavelength. We investigate circular plasmonic Bragg cavities enhancing single GeV nanodiamonds (NDs) zero phonon line. Following simulations of enhancement different configuration parameters, appropriately designed together with out-coupling gratings...

Spin-based, quantum-photonics promise to realize distributed quantum computing and networks. The performance depends on an efficient entanglement distribution where cavity electrodynamics could boost the efficiency. central challenge is development of compact devices with large spin-photon coupling rates a high operation bandwidth. Photonic crystal cavities comprise strong field confinement but require highly accurate positioning atomic systems in mode maxima. Negatively charged...

Optically active color centers in nanodiamonds offer unique opportunities for generating and manipulating quantum states of light. These mechanically, chemically, optically robust emitters can be produced mass quantities, deterministically manipulated, integrated with a variety device geometries photonic material platforms. Nanodiamonds deeply sub-wavelength sizes coupled to nanophotonic structures feature giant enhancement light-matter interaction, promising high bitrates systems. We review...