Nuclear quantum-assisted magnetometer

Häberle, Thomas; Oeckinghaus, Thomas; Schmid-Lorch, Dominik; Pfender, Matthias; Oliveira, Felipe Fávaro de; Momenzadeh, Sirous; Finkler, Amit; Wrachtrup, Jörg

doi:10.1063/1.4973449

Cited by 20 publications

(16 citation statements)

References 37 publications

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“…By operating at these fields, Neumann et al [ 14 ] reached the single-shot readout regime for the

N nuclear spin, with a fidelity of

. Subsequent analysis of the single-shot technique in the context of quantum sensing shows how the time-averaged SNR can be improved by an order of magnitude compared to traditional PL readout [ 116 ].…”

Section: Nuclear-assisted Readoutmentioning

confidence: 99%

“…Optimizing the trade-off between the number of experimental repeats and single-shot SNR can result in drastic improvements in time-averaged SNR. Here, we describe the process for optimizing the measurement overhead in the context of SCC readout, using a model that can be directly adapted to nuclear-assisted readout [ 116 ] and low-temperature readout.…”

Section: Accounting For Measurement Overheadmentioning

confidence: 99%

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Spin Readout Techniques of the Nitrogen-Vacancy Center in Diamond

2018

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The diamond nitrogen-vacancy (NV) center is a leading platform for quantum information science due to its optical addressability and room-temperature spin coherence. However, measurements of the NV center’s spin state typically require averaging over many cycles to overcome noise. Here, we review several approaches to improve the readout performance and highlight future avenues of research that could enable single-shot electron-spin readout at room temperature.

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“…By operating at these fields, Neumann et al [ 14 ] reached the single-shot readout regime for the

N nuclear spin, with a fidelity of

Section: Nuclear-assisted Readoutmentioning

confidence: 99%

Section: Accounting For Measurement Overheadmentioning

confidence: 99%

Spin Readout Techniques of the Nitrogen-Vacancy Center in Diamond

2018

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“…Explicitly accounting for the RTI and SCC overhead, our observed ξ corresponds to an ac magnetic sensitivity of 1.3 nT/Hz 1/2 [33]. Other readout techniques used in quantum sensors, such as the nuclear-assisted method [10,40], would also see similar signal-acquisition improvements due to RTI. In many situations, the gains are likely to be even larger than we have demonstrated, since NV centers located in nanodiamonds or close to surfaces typically exhibit lower steady-state charge populations than those in bulk diamond [20,36].…”

mentioning

confidence: 91%

Real-Time Charge Initialization of Diamond Nitrogen-Vacancy Centers for Enhanced Spin Readout

et al. 2020

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A common impediment to qubit performance is imperfect state initialization. In the case of the diamond nitrogen-vacancy (NV) center, the initialization fidelity is limited by fluctuations in the defect's charge state during optical pumping. Here, we use real-time control to deterministically initialize the NV center's charge state at room temperature. We demonstrate a maximum charge initialization fidelity of 99.4±0.1% and present a quantitative model of the initialization process that allows for systems-level optimization of the spin-readout signal-to-noise ratio. Even accounting for the overhead associated with the initialization sequence, increasing the charge initialization fidelity from the steady-state value of 75% near to unity allows for a factor-of-two speedup in experiments while maintaining the same signal-to-noise-ratio. In combination with high-fidelity readout based on spin-to-charge conversion, real-time initialization enables a factor-of-20 speedup over traditional methods, resulting in an ac magnetic sensitivity of 1.3 nT/Hz 1/2 for our single NV-center spin. The real-time control method is immediately beneficial for quantum sensing applications with NV centers as well as probing charge-dependent physics, and it will facilitate protocols for quantum feedback control over multi-qubit systems.arXiv:1907.08741v1 [quant-ph]

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“…The nuclear spins near optically addressable electron spins like NV centers are also a resource for storing and retrieving quantum information, and form the basis of hybrid-spin quantum information processors [12][13][14][15][16][17]. Nuclear spins are also useful ancillae for quantum sensing, where the qubit-nuclear spin interaction is harnessed for more precise sensing [18][19][20][21][22][23] or accessing new sensing modalities [24][25][26][27]. Novel means of spin bath control are thus sought to tailor the environment around the qubit as needed, decoupling spins in the bath from each other and also from the central electron spin.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic electron-nuclear interactions in a rotating quantum spin bath

et al. 2021

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The interaction between a central qubit spin and a surrounding bath of spins is critical to spin-based solid-state quantum sensing and quantum information processing. Spin-bath interactions are typically strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance to simulate motional averaging of anisotropic interactions, such as dipolar coupling between nuclear spins. Here, we show that the interaction between electron spins of nitrogen-vacancy centers and a bath of 13 C nuclear spins in a diamond rotated at up to 300 000 rpm introduces decoherence into the system via frequency modulation of the nuclear spin Larmor precession. The presence of an off-axis magnetic field necessary for averaging of the dipolar coupling leads to a rotational dependence of the electron-nuclear hyperfine interaction, which cannot be averaged out with experimentally achievable rotation speeds. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.

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Nuclear quantum-assisted magnetometer

Cited by 20 publications

References 37 publications

Spin Readout Techniques of the Nitrogen-Vacancy Center in Diamond

Spin Readout Techniques of the Nitrogen-Vacancy Center in Diamond

Real-Time Charge Initialization of Diamond Nitrogen-Vacancy Centers for Enhanced Spin Readout

Anisotropic electron-nuclear interactions in a rotating quantum spin bath

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