Extending the coherence of spin defects in hBN enables advanced qubit control and quantum sensing

Rizzato, Roberto; Schalk, Martin; Mohr, Stephan; Hermann, Jens C.; Leibold, Joachim P.; Bruckmaier, Fleming; Salvitti, Giovanna; Qian, Chenjiang; Ji, Peirui; Astakhov, Georgy V.; Kentsch, Ulrich; Helm, Manfred; Stier, Andreas V.; Finley, Jonathan J.; Bucher, Dominik B.

doi:10.1038/s41467-023-40473-w

Cited by 21 publications

(3 citation statements)

References 78 publications

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“…First, we believe that almost all previous works using for sensing applications could greatly benefit from simply switching to our newly prepared h 10 B 15 N sample. The demonstrated sensitivity improvement is also fully compatible with other ongoing optimization efforts on sensors, such as dynamical decoupling protocols to extend T 2 24 , 27 , coupling to optical cavities 54 – 56 and increasing number and density 24 , 57 , 58 to improve fluorescent signals. Second, the individual addressability of hyperfine transitions in h 10 B 15 N allows the utilization of nearby nuclear spins as valuable quantum resources and provides a promising platform to realize multi-qubit quantum registers in two-dimensional materials.…”

Section: Resultssupporting

confidence: 66%

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Isotope engineering for spin defects in van der Waals materials

Gong,

Du,

Janzen

et al. 2024

Nat Commun

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Spin defects in van der Waals materials offer a promising platform for advancing quantum technologies. Here, we propose and demonstrate a powerful technique based on isotope engineering of host materials to significantly enhance the coherence properties of embedded spin defects. Focusing on the recently-discovered negatively charged boron vacancy center ($${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − ) in hexagonal boron nitride (hBN), we grow isotopically purified h10B15N crystals. Compared to $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − in hBN with the natural distribution of isotopes, we observe substantially narrower and less crowded $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − spin transitions as well as extended coherence time T2 and relaxation time T1. For quantum sensing, $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − centers in our h10B15N samples exhibit a factor of 4 (2) enhancement in DC (AC) magnetic field sensitivity. For additional quantum resources, the individual addressability of the $${{{{{{{{\rm{V}}}}}}}}}_{{{{{{{{\rm{B}}}}}}}}}^{-}$$ V B − hyperfine levels enables the dynamical polarization and coherent control of the three nearest-neighbor 15N nuclear spins. Our results demonstrate the power of isotope engineering for enhancing the properties of quantum spin defects in hBN, and can be readily extended to improving spin qubits in a broad family of van der Waals materials.

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Section: Resultssupporting

confidence: 66%

“…In particular, the presence of such a dense nuclear spin bath can substantially broaden electronic transitions and shorten the coherence time of spin defects. To this end, prior experimental works have focused on designing dynamical decoupling sequences to isolate spin defects from the local nuclear spin environment in hBN 24 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Isotope engineering for spin defects in van der Waals materials

Gong,

Du,

Janzen

et al. 2024

Nat Commun

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“…[258] Other techniques, such as the pulsed dynamical decoupling used in Ref. [259], have extended the spin coherence time to 7.5 μs, very close to the fundamental T 1 limit. On single-spin detection, the first roomtemperature optically detected magnetic resonance from single carbon-related defects in hBN was reported in Ref.…”

Section: Specific Advantages Of the Materialsmentioning

confidence: 97%

Solid‐State Single‐Photon Sources: Recent Advances for Novel Quantum Materials

Esmann,

Wein,

Antón‐Solanas

2024

Adv Funct Materials

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In this review, the current landscape of emergent quantum materials for quantum photonic applications is described. The review focuses on three specific solid‐state platforms: single emitters in monolayers of transition metal dichalcogenides (TMDs), defects in hexagonal boron nitride (hBN), and colloidal quantum dots in perovskites (PQDs). These platforms share a unique technological accessibility, enabling the rapid implementation of testbed quantum applications, all while being on the verge of becoming technologically mature enough for a first generation of real‐world quantum applications. The review begins with a comprehensive overview of the current state‐of‐the‐art for relevant single‐photon sources in the solid‐state, introducing the most important performance criteria and experimental characterization techniques along the way. Progress for each of the three novel materials is then benchmarked against more established (yet complex) platforms, highlighting performance, material‐specific advantages, and giving an outlook on quantum applications. This review will thus provide the reader with a snapshot on latest developments in the fast‐paced field of emergent single‐photon sources in the solid‐state, including all the required concepts and experiments relevant to this technology.

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Detecting and Imaging of Magnons at Nanoscale with van der Waals Quantum Sensor

Zang,

Jiang,

Guo

et al. 2024

Adv Funct Materials

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Magnonic devices are extensively studied for energy‐efficient information processing. High spatial resolution and high accuracy measurement is required to characterize the excitation and distribution of magnons. Here, sensing and imaging of magnons in the magnetic insulator (YIG) is realized with negatively charged boron vacancy () spin defects in 2D hexagonal boron nitride (hBN). Thermal magnon noise is studied through spin relaxometry, illustrating the nanometers proximity of the 2D quantum sensor over a large area. The small probe‐sample standoff distance helps to detect weak signals with diffraction‐limited spatial resolution. The uniform out‐of‐plane symmetry axis of is further utilized to study perpendicular magnetic anisotropy (PMA). It effectively extracts the stray field of microwave‐excited magnons from the direct stripline field. The distributions of propagating and localized magnons in different structures are subsequently imaged and analyzed. The work provides the strategy for utilizing the distinctive advantages of the van der Waals quantum sensor in magnetic imaging. The results will promote the development of magnonic devices for diverse applications.

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Extending the coherence of spin defects in hBN enables advanced qubit control and quantum sensing

Abstract: Negatively-charged boron vacancy centers ($${{V}_{B}}^{-}$$ V B − ) in hexagonal Boron Nitride (hBN) are attracting increasing interest since they represent … Show more

Cited by 21 publications

References 78 publications

Isotope engineering for spin defects in van der Waals materials

Isotope engineering for spin defects in van der Waals materials

Solid‐State Single‐Photon Sources: Recent Advances for Novel Quantum Materials

Detecting and Imaging of Magnons at Nanoscale with van der Waals Quantum Sensor

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