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Phonons are considered to be universal quantum transducers due to their ability to couple to a wide variety of quantum systems. Among these systems, solid-state point defect spins are known for being long-lived optically accessible quantum memories. Recently, it has been shown that inversion-symmetric defects in diamond, such as the negatively charged silicon vacancy center (SiV), feature spin qubits that are highly susceptible to strain. Here, we leverage this strain response to achieve coherent and low-power acoustic control of a single SiV spin, and perform acoustically driven Ramsey interferometry of a single spin. Our results demonstrate a novel and efficient method of spin control for these systems, offering a path towards strong spin-phonon coupling and phonon-mediated hybrid quantum systems., Fixed errors in numbering of references, separated manuscript and supplementary info

Diamond is a promising material for the realization of quantum information technology as it hosts optically active color centers with long lived spin coherence and has material properties that allow for efficient use of photons and phonons as quantum information carriers. For many years, implementation of devices leveraging these properties was hampered by the lack of techniques for heteroepitaxial growth of pure diamond films, which prevented straightforward application of traditional nanophotonic fabrication techniques. Recently, new fabrication procedures have emerged and enabled the fabrication of nanostructures for various applications ranging from improved photon and phonon manipulation to cavity QED. Of particular importance is the development of freestanding diamond devices which has led to the creation of diamond photonic crystal cavities coupled to color centers. Such structures have enabled benchmark experiments towards the implementation of long-range, optically-mediated quantum networks. Furthermore, these procedures can also be used to engineer nanomechanical devices for creating coherent interactions between color centers and phonons, potentially enabling the creation of complementary shorter range, mechanically-mediated networks. Finally, optomechanical devices mediating photon-phonon interactions promise to gain further control over these two degrees of freedom as well as to enable the interfacing of quantum systems at vastly differing energy scales. In this chapter we trace the progression of fabrication techniques, performance benchmarks, and applications for these devices and highlight promising directions for future research.

We present quantum network nodes that leverage integration of nanophotonic, electromechanical, and microwave technology to control the optical and spin properties of silicon-vacancy (SiV) color-centers in diamond. We demonstrate strain induced quantum interference between SiV color centers coupled to nanophotonic devices.

We present a nano-electromechanical platform for controlling optical transitions from spatially separated color centers in diamond waveguides. We use this technology to greatly suppress spectral diffusion and demonstrate strain induced quantum interference between separate emitters.

We investigate diamond optomechanical crystals (OMCs) with implanted silicon vacancy (SiV) centers at cryogenic temperatures (T ~ 5K). Large strain fields per phonon in OMC mechanical modes, coupled with high SiV strain susceptibility, enables high electron- phonon coupling between SiV-OMC with cooperativity ~0.5 at 5K.

Raman scattering spectra of Fe 1 + y Te 1 − x Se x ( x =0, y =0.07; x =0.1, y =0.05 and x =0.4, y =0.02) alloys are measured in a temperature range between 20 K and 300 K. The A 1 g and B 1 g Raman active modes have been experimentally observed at energies 156 and 198 cm −1 , which is in rather good agreement with the lattice dynamics calculation. The antiferromagnetic spin ordering below 70 K in Fe 1.07 Te leaves a fingerprint only in the B 1 g phonon mode linewidth and energy, whose temperature dependence follows the normalized magnetic susceptibility, indicating the presence of the spin-phonon coupling. The frequency and the linewidth of the A 1g mode assume a conventional anharmonic temperature dependence in all measured samples, which is also the case for the B 1g mode in the Se doped samples. The linewidth (energy) of the A 1g mode decreases (increases) with doping, whereas the opposite is seen for the B 1g mode.

The paper addresses the issue of health risk associated with the presence of chrysotile in the soil type ranker formed on massive serpentines occurring in the area of Bubanj Potok, a settlement located in the southern Belgrade environs, Serbia. Characterization of the ranker soil was conducted by scanning electron microscopy, X-ray diffraction, micro-Raman spectroscopy and transmission 57Fe Mössbauer spectroscopy. Scanning electron microscopy figures showed regular shaped smectite (montmorillonite) particles, aggregates of chlorite, and elongated sheets of serpentines minerals antigorite. X-ray diffraction analysis confirmed the presence of detrital mineral quartz polymorph as well as minor amounts of other mineral species. Micro-Raman spectroscopy identified the presence of dominant minerals, such as montmorillonite, kaolinite, muscovite, gypsum, calcite, albite, amphiboles (hornblende/kaersutite) and orthoclase. Important polymorph silica modifications of quartz, olivine (forsterite), pyroxene (enstatite/ferrosilite, diopside/hedenbergite), and serpentine (antigorite/lizardite/chrysotile) were identified. Rad se bavi pitanjem zdravstvenog rizika povezanog sa prisustvom hrizotila u rankeru (tip zemljišta) formiranom na masivnom serpentinitu u oblasti Bubanj Potoka, naselju koje se nalazi u južnoj okolini Beograda. Karakterizacija rankera je izvršena skenirajućom elektronskom mikroskopijom, rendgenskom difrakcijom praha, mikro-Raman spektroskopijom i transmisionom 57Fe Mesbauer spektroskopijom. Slike dobijene skenirajućim elektronskim mikroskopom pokazuju čestice smektita regularnog oblika montmorionita, agregata hlorita i izdužene listove serpentinskog minerala antigorita. Rendgenska difrakciona analiza potvrdila je prisustvo detrital minerala kvarcnog polimorfa kao i manje količine drugih mineralnih vrsta. Mikro-Raman spektroskopija identifikovala je prisustvo dominantnih minerala, kao što su montmorionit i kaolinit, muskovit, gips, kalcit, albit, amfibol (kaersutit/hornblenda) i ortoklas. Važni polimorfi silika modifikacije kvarca, olivina (forsterit), piroksena (enstatit, ferosilit, hedenbergit, diopsid), i serpentina (antigorit, lizardit, hrizotil) su bili identifikovani.

Coupling nitrogen-vacancy (NV) centers in diamonds to optical cavities is a promising way to enhance the efficiency of diamond-based quantum networks. An essential aspect of the full toolbox required for the operation of these networks is the ability to achieve the microwave control of the electron spin associated with this defect within the cavity framework. Here, we report on the fabrication of an integrated platform for the microwave control of an NV center electron spin in an open, tunable Fabry–Pérot microcavity. A critical aspect of the measurements of the cavity’s finesse reveals that the presented fabrication process does not compromise its optical properties. We provide a method to incorporate a thin diamond slab into the cavity architecture and demonstrate the control of the NV center spin. These results show the promise of this design for future cavity-enhanced NV center spin-photon entanglement experiments.

We report on the fabrication and characterization of a Fabry-Perot microcavity enclosing a thin diamond membrane at cryogenic temperatures. The cavity is designed to enhance resonant emission of single nitrogen-vacancy centers by allowing spectral and spatial tuning while preserving the optical properties observed in bulk diamond. We demonstrate cavity finesse at cryogenic temperatures within the range of F=4000–12 000 and find a sub-nanometer cavity stability. Modeling shows that coupling nitrogen-vacancy centers to these cavities could lead to an increase in remote entanglement success rates by three orders of magnitude., Applied Physics Letters, 110 (17), ISSN:0003-6951, ISSN:1077-3118