In this work, we demonstrate initialization and readout of nuclear spins via a negatively charged silicon-vacancy (SiV) electron spin qubit. Under Hartmann-Hahn conditions the electron spin polarization is coherently transferred to the nuclear spin. The readout of the nuclear polarization is observed via the fluorescence of the SiV. We also show that the coherence time of the nuclear spin (6 ms) is limited by the electron spin-lattice relaxation due to the hyperfine coupling to the electron spin. This work paves the way towards realization of building blocks of quantum hardware with an efficient spin-photon interface based on the SiV color center coupled to a long lasting nuclear memory.Recent advances with color centers in diamond based on IV-group elements [1-4] hold promise to provide an efficient interface between photons and spin qubits. These color centers possess a high Debye-Waller factor (larger than 0.5) [5,6], which implies a high flux of coherent photons, and furthermore an exceptional spectral stability owing to the inversion symmetry of the defects [7,8]. Both of these properties are crucial to realize long distant entanglement based on light-matter interface [9][10][11] which forms an essential building block for scalable quantum processors and quantum repeaters. However, these color centers are not free of constraints. A main drawback is the limited coherence time of the electron spin which is induced by a fast phonon mediated relaxation process between the orbital branches of the ground state [12]. Different attempts to overcome this problem were recently demonstrated, including the application of high strain [13] or freezing of the specimen to millikelvin temperatures [14]. Of these two methods, the former leads to symmetry distortion that affects the optical properties, while the latter requires dilution refrigerators, which are expensive and offer only limited cooling capability. Another route to beat this limitation is to use a defect of this family only as a spin-photon interface and readout gate, while storing the information on a long living nuclear memory. However, to realize such a hybrid approach several problems have to be tackled. Among them are the initialization of the nuclear memory and its readout. The simple polarization technique utilizing level anticrossing and optical pumping commonly used for NV center coupled to 13 C or ST1 centers [15,16] is not applicable to the systems of SiV family. In this letter, we report deterministic polarization of a small nuclear spin ensemble via a dynamic nuclear polar- * petr.siyushev@uni-ulm.de ization protocol. By measuring the Larmor precession in different magnetic fields we identify these nuclei as 13 C. From this ensemble, we choose one nuclear spin with coupling strength in the order of few hundred kHz. This 13 C spin is used to demonstrate nuclear magnetic resonance and Rabi oscillations via nuclear spin polarization readout protocol. For the experiment, a 111 -oriented diamond sample containing ingrown SiV center was chosen and placed ...
The modification of the effect of interactions of a particle as a function of its preselected and postselected states is analyzed theoretically and experimentally. The universality property of this modification in the case of local interactions of a spatially preselected and postselected particle has been found. It allowed us to define an operational approach for the characterization of the presence of a quantum particle in a particular place: the way it modifies the effect of local interactions. The experiment demonstrating this universality property provides an efficient interferometric alignment method, in which the position of the beam on a single detector throughout one phase scan yields all misalignment parameters.
Solid-state laser refrigeration of semiconductors remains an outstanding experimental challenge. In this work, we show that, following excitation with a laser wavelength of 532 nm, bulk diamond crystals doped with H3 centers both emit efficient up-conversion (anti-Stokes) photoluminescence and also show significantly reduced photothermal heating relative to crystals doped with nitrogen–vacancy (NV) centers. The H3 center in diamond is a highly photostable defect that avoids bleaching at high laser irradiances of 10–70 MW/cm[Formula: see text] and has been shown to exhibit laser action, tunable over the visible band of 500–600 nm. The observed reduction of photothermal heating arises due to a decrease in the concentration of absorbing point defects, including NV-centers. These results encourage future exploration of techniques for H3 enrichment in diamonds under high-pressure, high-temperature conditions for the simultaneous anti-Stokes fluorescence cooling and radiation balanced lasing in semiconductor materials. Reducing photothermal heating in diamond through the formation of H3 centers also opens up new possibilities in quantum sensing via optically detected magnetic resonance spectroscopy at ambient conditions.
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