High-pressure crystallization and properties of diamond from magnesium-based catalysts

One ultimate goal of quantum information processing is to construct a quantum network for direct sharing of quantum information between distant parties based on stationary qubits for information storage and flying qubits for information transmission. This requires long‐lived quantum memories, efficient light–matter interface, and deterministic quantum gate operations. Among matter qubits, the electron spin of nitrogen vacancy center in diamond is an appealing option for its long coherence time at room temperature, deterministic microwave control, and optical preparation and readout of the qubit. However, its poor optical properties, including weak zero‐phonon‐line emission and large spectral diffusion, limit its potential for large‐scale deployment in quantum nodes. This has motivated the investigation for alternative quantum emitters that combine long‐time memory and coherent optical properties together. The emerging group‐IV split‐vacancy color centers in diamond, such as silicon‐vacancy, germanium‐vacancy, tin‐vacancy, and lead‐vacancy centers, are promising candidates of this ongoing exploration. These quantum emitters simultaneously possess microsecond spin coherence time and optically bright transitions with narrow linewidths. This review reports recent efforts on extending the spin coherence time of these color centers via temperature, strain, and charge control, which paves the road towards constructing solid‐based matter–photon interface for quantum network applications.

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“…(Data for SiV − , SnV − , GeV − , and PbV − color center, respectively, taken from refs. [66,68,37,69]).…”

Section: Optical Properties Of XV − Color Centers In Diamondmentioning

confidence: 99%

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

2019

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“…29,30 It should mention that the groups of -CH 2 -and -CH 3 have not ever been detected in natural diamond stones until now, but the structure of >C=CH 2 is universally observed in natural diamond stones of type-Ia. This consideration is supported by an experimental fact that -CH 2 -group presents in diamond specimens synthesized in the NiFe-C-H 2 O system in the temperature range 1300-1370 °C, while the structure of >C=CH 2 appears instead in diamond crystals grown in the S-C-H 2 O system at temperatures exceeding 1800 °C.…”

Section: Resultsmentioning

confidence: 99%

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

et al. 2015

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Employing floatage as a driving force for diamond growth, crystallization of diamond crystals in Fe-Cr-C system co-doped with nitrogen and hydrogen elements is established at a static pressure of ∼6.5 GPa and a temperature range of 1335-1485 °C. Under the influence of nitrogen and hydrogen incorporated into diamond structure, simultaneously, a rich morphological diversity of diamond specimens is produced, such as hexagonal slice-shape, trapezoidal slice-shape, strip shape and triangular slice-shape crystals. Observation on infrared spectra from as-grown crystals indicates that a dramatic enhancement of the incorporation of hydrogen and nitrogen atoms with each other into diamond structure are present in strip-shape specimens, confirmed by a fact that a relatively high absorption coefficients at the peaks of 1130 cm -1 , and 1344 cm -1 accompany with high absorption coefficients at the bands of 2850 cm -1 , and 2920 cm -1 . Hydrogen-related absorption in three-phonon region further indicated that hydrogen atoms existed in diamond structure in sp 3 bonded -CH 2 -, and -CH 3 group form, respectively. At atmospheric pressure, these hydrogen-related structures are rather stable and can sustain high temperature up to 1800 °C. Nitrogen donors are universally observed as isolated substitutional form in crystals, while minor paired-form nitrogen atoms readily formed in the strip shape crystals or other crystals crystallized at higher temperature.

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“…The crystals are colorless but also contain brown or even black zones. More information about the synthesis conditions and spectroscopic characterization can be found in the series of papers …”

Section: Methodsmentioning

confidence: 99%

“…The nitrogen‐vacancy (NV 0/− ) and silicon‐vacancy (SiV 0/− ) centers are the most studied centers, they have narrow zero‐phonon lines and can be used in different applications in quantum optics . Also, the negatively charged germanium‐vacancy (GeV − ) and tin‐vacancy (SnV − ) centers have been detected recently by optical spectroscopy, these defects can be considered as the analogs of the silicon‐vacancy center . Since the discussed defects are thought to be used in quantum applications, it is especially important to study their relaxation dynamics.…”

Section: Introductionmentioning

confidence: 99%

Spin Relaxation of the Neutral Germanium‐Vacancy Center in Diamond

Komarovskikh

Uvarov

Nadolinny

et al. 2018

Physica Status Solidi (a)

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The germanium‐vacancy center in diamond is actively studied because it is promising in various quantum‐optical and quantum‐informational applications. There is not much information about the paramagnetic neutral germanium‐vacancy center (GeV0) in triplet spin state. In this work, the spin relaxation of the GeV0 is studied by pulse electron paramagnetic resonance (EPR) technique at low temperatures. It is shown that spin‐lattice and spin‐spin relaxation times for the GeV0 are shorter than corresponding times for the neutral silicon‐vacancy center. The Orbach mechanism of spin‐lattice relaxation dominates for the GeV0 center in the temperature range 80–110 K (activation energy Ea = 39(6) meV).

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High-pressure crystallization and properties of diamond from magnesium-based catalysts

Cited by 58 publications

References 78 publications

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

Building Blocks for Quantum Network Based on Group‐IV Split‐Vacancy Centers in Diamond

Crystallization of HPHT diamond crystals in a floatage system under the influence of nitrogen and hydrogen simultaneously

Spin Relaxation of the Neutral Germanium‐Vacancy Center in Diamond

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