Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit

Schmid-Lorch, Dominik; Häberle, Thomas; Reinhard, Friedemann; Zappe, Andrea; Slota, Michael; Bogani, Lapo; Finkler, Amit; Wrachtrup, Jörg

doi:10.1021/acs.nanolett.5b00679

Cited by 56 publications

(49 citation statements)

References 33 publications

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“…The tremendous reduction in acquisition time will make previously time-consuming measurements possible. This is particularly significant in scanning probe applications, where the integration time per pixel reaches up to minutes, [14][15][16]39,43 rendering high-resolution scans practically impossible. Additionally, more information can be acquired in the same time, e.g.…”

Section: Discussionmentioning

confidence: 99%

Nuclear quantum-assisted magnetometer

Häberle

Oeckinghaus

Schmid-Lorch

et al. 2017

Review of Scientific Instruments

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Magnetic sensing and imaging instruments are important tools in biological and material sciences. There is an increasing demand for attaining higher sensitivity and spatial resolution, with implementations using a single qubit offering potential improvements in both directions. In this article we describe a scanning magnetometer based on the nitrogen-vacancy center in diamond as the sensor. By means of a quantum-assisted readout scheme together with advances in photon collection efficiency, our device exhibits an enhancement in signal to noise ratio of close to an order of magnitude compared to the standard fluorescence readout of the nitrogenvacancy center. This is demonstrated by comparing non-assisted and assisted methods in a T 1 relaxation time measurement.

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Section: Discussionmentioning

confidence: 99%

Nuclear quantum-assisted magnetometer

Häberle

Oeckinghaus

Schmid-Lorch

et al. 2017

Review of Scientific Instruments

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“…Improving the sensitivity of high frequency sensing schemes is of great significance, especially for classical fields sensing [1][2][3], detection of electron spins in solids [4,5] and nuclear magnetic resonance spectroscopy [6]. The common method to detect high frequency field components is based on relaxation measurements, where the signal induces an observable effect on the lifetime, T 1 , of the probe system [4,5,7]. Nevertheless, the sensitivity of this method is limited by the pure dephasing time T * 2 of the probe system.…”

mentioning

confidence: 99%

Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling

et al. 2017

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State-of-the-art methods for sensing weak AC fields are only efficient in the low frequency domain (<10 MHz). The inefficiency of sensing high-frequency signals is due to the lack of ability to use dynamical decoupling. In this paper we show that dynamical decoupling can be incorporated into high-frequency sensing schemes and by this we demonstrate that the high sensitivity achieved for low frequency can be extended to the whole spectrum. While our scheme is general and suitable to a variety of atomic and solid-state systems, we experimentally demonstrate it with the nitrogen-vacancy center in diamond. For a diamond with natural abundance of 13C, we achieve coherence times up to 1.43 ms resulting in a smallest detectable magnetic field strength of 4 nT at 1.6 GHz. Attributed to the inherent nature of our scheme, we observe an additional increase in coherence time due to the signal itself.

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“…The magnetic field of random placed Fe 3 O 4 particles had two effects on the spin dynamics of NV center. The static component of magnetic field shifts the resonant frequencies of NV spin state transitions [27,[30][31][32], and fluctuating component reduces the coherence time of spin state [33][34][35][36][37]. Firstly, we measured the static component of magnetic field.…”

Section: High Contrast Magnetic Field Imagingmentioning

confidence: 99%

High-Contrast Quantum Imaging with Time-Gated Fluorescence Detection

Chen

Zheng

et al. 2019

Phys. Rev. Applied

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Optical detection of spin state has been widely used for the solid state spin qubit in the application of quantum information processing. The signal contrast determines the accuracy of quantum state manipulation, sensitivity of quantum sensing and resolution of quantum imaging. Here, we demonstrated a time-gated fluorescence detection method for enhancing the spin state signal contrast of nitrogen vacancy (NV) center in diamond. By adjusting the delay between time gate and the excitation laser pulse, we improved both the signal contrast and signal-to-noise ratio for NV spin detection. An enhancement ratio of 1.86 times was reached for the signal contrast. Utilizing the time-gated fluorescence detection, we further demonstrated a high contrast quantum imaging of nanoparticle's stray magnetic field. Without any additional manipulation of the quantum state, we expect that this method can be used to improve the performance of various applications with NV center.

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Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit

Cited by 56 publications

References 33 publications

Nuclear quantum-assisted magnetometer

Nuclear quantum-assisted magnetometer

Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling

High-Contrast Quantum Imaging with Time-Gated Fluorescence Detection

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