A high-spin nucleus coupled to a color center can act as long-lived memory qudit in spin-photon interface. The germanium vacancy (GeV) diamond has attracted recent attention due its excellent spectral properties and provides access the ten-dimensional Hilbert space of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>I</a:mi><a:mo>=</a:mo><a:mn>9</a:mn><a:mo>/</a:mo><a:mn>2</a:mn></a:math> <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...

The room temperature compatibility of the negatively charged nitrogen-vacancy (NV−) center in diamond makes it ideal quantum system for a university teaching lab. Here, we describe low-cost experimental setup coherent control experiments on electronic spin state NV− center. We implement spin-relaxation measurements, optically detected magnetic resonance, Rabi oscillations, and dynamical decoupling sequences an ensemble centers. relatively short times required to perform each these...

A practical implementation of a quantum computer requires robust qubits that are protected against their noisy environment. Dynamical decoupling techniques have been successfully used in the past to offer high-fidelity gate operations negatively charged nitrogen-vacancy (${\mathrm{NV}}^{\ensuremath{-}}$) centers diamond, albeit under specific conditions with intrinsic nitrogen nuclear spin initialized. In this work, we show how sinusoidally modulated, always rotating, and tailored (SMART)...

Magnetic fields are a standard tool in the toolbox of every physicist and required for characterization materials, as well polarization spins nuclear magnetic resonance or electron paramagnetic experiments. Quite often, static field sufficiently large, but fixed, magnitude is suitable these tasks. Here, we present permanent magnet assembly that can achieve strengths up to 1.5 T over an air gap length 7 mm. The based on Halbach array neodymium magnets, with inclusion soft material Supermendur...

Abstract Double‐negative refractive index materials have attracted sustained experimental and theoretical interest because they can display a range of surprising optical phenomena, including negative Doppler shifts perfect lensing. indexes been achieved experimentally in engineered metamaterials; however, these become increasingly challenging to fabricate at shorter wavelengths, wavelengths only 2D achieved. Here, it is shown that double‐negative occur natural material, near narrow...

Microwave delivery to samples in a cryogenic environment can pose experimental challenges such as restricting optical access, space constraints, and heat generation. Moreover, existing solutions that overcome various restrictions do not necessarily provide large homogeneous oscillating magnetic field over macroscopic length scales, which is required for control of spin ensembles or fast gate operations scaled-up quantum computing implementations. Here, we show coherent negatively charged...

A high-spin nucleus coupled to a color center can act as long-lived memory qudit in spin-photon interface. The germanium vacancy (GeV) diamond has attracted recent attention due its excellent spectral properties and provides access the ten-dimensional Hilbert space of $I=9/2$ ${}^{73}$Ge nucleus. Here, we observe ${}^{73}$GeV hyperfine structure, perform nuclear spin readout, optically initialize into any eigenstate on $\mu$s timescale with fidelity up $\sim 84\%$. Our results establish an...

Coherent control and optical readout of the electron spin $^{29}$SiV$^{-}$ center in diamond has been demonstrated literature, with exciting prospects for implementations as memory nodes qubits. Nuclear spins may be even better suited many applications quantum information processing due to their long coherence times. Control nuclear using conventional NMR techniques is feasible, albeit at slow kilohertz rates spin's low gyromagnetic ratio. In this work we theoretically demonstrate how...

The negatively charged nitrogen-vacancy (NV$^-$) center in diamond is a model quantum system for university teaching labs due to its room-temperature compatibility and cost-effective operation. Based on the low-cost experimental setup that we have developed described coherent control of electronic spin (Sewani et al.), introduce explain here number more advanced experiments probe electron-nuclear interaction between \nv \NN~and \CC~nuclear spins. Optically-detected magnetic resonance (ODMR),...

Progress with quantum technology has for a large part been realized the nitrogen-vacancy centre in diamond. Part of its properties, however, are nonideal and this drives research into other spin-active crystal defects. Several these come much stronger energy scales spin-orbit hyperfine coupling, but how affects their spin coherence is little explored. Vanadium silicon carbide such system, technological interest optical emission at telecom wavelength compatibility semiconductor industry. Here...

All-optical control enables fast quantum operations on color center spins that are typically realized via a single Raman transition in $\Lambda$-system. Here, we simultaneously drive both transitions double $\Lambda$-system to the spin of germanium vacancy (GeV) diamond. In doing so, achieve operations, observe interference between two and probe GeV coherence ($T_2^*=224\pm14$ ns, $T_2^{\rm H}=11.9\pm0.3$ $\mu$s). Importantly, is applicable other centers particularly, group-IV defects

We perform coherent population trapping (CPT) experiments to measure the hyperfine coupling of a single 73GeV be A∼37 MHz. Furthermore, we identify rapid nuclear spin diffusion process that occurs when performing CPT and leverage it realise all-optical, arbitrary state preparation at timescales approaching ∼1 μs. This is fundamental step in gaining access otherwise difficult address qudit paves way for future research regarding 73GeV.

Colour centres in diamond are attractive candidates for numerous quantum applications due to their good optical properties and long spin coherence times. They also provide access the even longer of hyperfine coupled nuclear spins environment. While NV centre is well studied, both experiment theory, couplings more novel (SiV, GeV, SnV) still largely unknown. Here we report on first all-electron \textit{ab-initio} calculations constants SiV, SnV defects diamond, respective defect atoms...

A practical implementation of a quantum computer requires robust qubits that are protected against their noisy environment. Dynamical decoupling techniques have been successfully used in the past to offer high-fidelity gate operations negatively-charged Nitrogen-Vacancy (NV-) centers diamond, albeit under specific conditions with intrinsic nitrogen nuclear spin initialised. In this work, we show how SMART protocol, an extension dressed-qubit concept, can be implemented for continuous...