Nanoscale Vector Magnetometry with a Fiber‐Coupled Diamond Probe

Liu, Hangyu; Liu, Wenzhao; Wang, Mengqi; Ye, Xiangyu; Yu, Pei; Sun, Haoyu; Liu, Z.Y.; Liu, Zhao‐Xin; Zhang, Jingwei; Wang, Pengfei; Shi, Fazhan; Wang, Ya

doi:10.1002/qute.202300127

Cited by 4 publications

(1 citation statement)

References 45 publications

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“…The charge states of solid‐state defects are critical to the excellent properties of their electronic spins in quantum information and metrology, [ 1 − 5 ] among which the negatively charged nitrogen−vacancy (NV) centers (NV − ) possess extraordinary abilities in sensing manifold physical quantities [ 6 − 10 ] with nanoscale resolution [ 11 − 14 ] and have already been utilized in sensing of biological materials, [ 11,15 ] arbitrary‐frequency magnetic fields and microwave (MW) fields. [ 16 − 19 ] However, neutral NV centers (NV 0 ) could only generate inevitable background fluorescence and reduce the contrast of NV − .…”

Section: Introductionmentioning

confidence: 99%

Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

Li,

Yuan,

Bian

et al. 2024

Adv Quantum Tech

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The nitrogen−vacancy (NV) center in diamond gains its versatility when negatively charged (NV−) but is mediocre when neutrally charged. Particularly, the charge states of NV centers are convertible under optical pumping and during the dark intervals, whose dynamics are mixed with the NV−s’ spin polarizations and relaxations, making them difficult to detect. Here, a microwave‐pulses‐assisted charge state dynamics (CSD) measurement method of NV centers in the dark time (DT) is proposed. The microwave pulses are designed to manipulate the populations of the NV−s’ ground state spin triplets (qutrit) to the equilibrium state before the DT. Thus, the longitudinal relaxations of the qutrit are balanced, and pure CSD can be detected. Interestingly, in an annealed bulk diamond, not only the traditional tunneling‐induced fast exponential CSD are observed, but also a slow and long‐term recharging process, which is probably attributed to the exchanging of the electrons between NV centers and the high‐energy‐level charge traps such as vacancy clusters. Furthermore, results demonstrate a 40% increase in NV−s’ contrast by properly extending the recharging DT. These results are significant for the in‐depth study of the NV centers’ CSD and can improve the sensing abilities of the NV− ensemble.

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Section: Introductionmentioning

confidence: 99%

Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

Li,

Yuan,

Bian

et al. 2024

Adv Quantum Tech

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Fiber‐Integrated van der Waals Quantum Sensor with an Optimal Cavity Interface

Moon,

Whitefield,

Spencer

et al. 2024

Advanced Optical Materials

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Integrating quantum materials with fiber optics adds advanced functionalities to a variety of applications, and introduces fiber‐based quantum devices such as remote sensors capable of probing multiple physical parameters. However, achieving optimal integration between quantum materials and fibers is challenging, particularly due to difficulties in fabrication of quantum elements with suitable dimensions and an efficient photonic interface to a commercial optical fiber. Here a new modality for a fiber‐integrated van der Waals quantum sensor is demonstrated. A hole‐based circular Bragg grating cavity from hexagonal boron nitride (hBN) is designed and fabricated, engineer optically active spin defects within the cavity, and integrate the cavity with an optical fiber using a deterministic pattern transfer technique. The fiber‐integrated hBN cavity enables efficient excitation and collection of optical signals from spin defects in hBN, thereby enabling all‐fiber integrated quantum sensors. Moreover, remote sensing of a ferromagnetic material and of arbitrary magnetic fields is demonstrated. All in all, the hybrid fiber‐based quantum sensing platform may pave the way to a new generation of robust, remote, multi‐functional quantum sensors.

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Planar scanning probe microscopy enables vector magnetic field imaging at the nanoscale

Weinbrenner,

Quellmalz,

Giese

et al. 2024

Quantum Sci. Technol.

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Planar scanning probe microscopy is a recently emerging alternative approach to tip-based scanning probe imaging. It can scan an extended planar sensor, such as a polished bulk diamond doped with magnetic-field-sensitive nitrogen-vacancy (NV) centers, in nanometer-scale proximity of a planar sample. So far, this technique has been limited to optical near-field microscopy, and has required nanofabrication of the sample of interest. Here we extend this technique to magnetometry using NV centers, and present a modification that removes the need for sample-side nanofabrication. We harness this new ability to perform a hitherto infeasible measurement - direct imaging of the three-dimensional vector magnetic field of magnetic vortices in a thin film magnetic heterostructure, based on repeated scanning with NV centers with different orientations within the same scanning probe. Our result opens the door to quantum sensing using multiple qubits within the same scanning probe, a prerequisite for the use of entanglement-enhanced and massively parallel schemes.

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Nanoscale Vector Magnetometry with a Fiber‐Coupled Diamond Probe

Cited by 4 publications

References 45 publications

Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

Measurement of Charge State Dynamics in Nitrogen−Vacancy Centers Based on Microwave‐Pulses‐Assisted Longitudinal Relaxations Balancing of Spin Qutrit

Fiber‐Integrated van der Waals Quantum Sensor with an Optimal Cavity Interface

Planar scanning probe microscopy enables vector magnetic field imaging at the nanoscale

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