High-efficiency fluorescence collection for NV<sup>-</sup> center ensembles in diamond

Xu, Lixia; Yuan, Hui; Zhang, Ning; Zhang, Jixing; Bian, Guodong; Fan, Pengcheng; Li, Mingxin; Zhang, Chen; Zhai, Yueyang; Fang, Jiancheng

doi:10.1364/oe.27.010787

Cited by 33 publications

(15 citation statements)

References 31 publications

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“…A possible option for improvement would be an adaptation of the fluorescence waveguide excitation and collection [37] which reported a 96-fold improvement in the light collected. Another approach would be to surrounded the diamond with a total internal reflection lens to collect light from the diamond sides and focus it toward a small area [38], which would be easier to integrate with our system, leading to an enhancement of 56 in the photon collection when compared to a lossless air objective of 0.55 N.A. This would represent a photon enhancement of ∼30 for our system and assuming a shot-noise limited scaling the measured sensitivity would become ∼60 pT/ √ Hz.…”

Section: Discussionmentioning

confidence: 99%

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Patel,

Zhou,

Frangeskou

et al. 2020

Preprint

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Sensing small magnetic fields is relevant for many applications ranging from geology to medical diagnosis. We present a fiber-coupled diamond magnetometer with a sensitivity of (310 ± 20) pT/ √ Hz in the frequency range of 10-150 Hz. This is based on optically detected magnetic resonance of an ensemble of nitrogen vacancy centers in diamond at room temperature.Fiber coupling means the sensor can be conveniently brought within 2 mm of the object under study.

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Section: Discussionmentioning

confidence: 99%

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Patel,

Zhou,

Frangeskou

et al. 2020

Preprint

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“…( 8), we first initialize all NV-center electronic spins in |0 through resonant optical excitations [the initialization duration is of the order of O(100) μs [52] and is executed simultaneously for all NV-center electronic spins], then one performs the global rotation e i π 2 J y [50]. In addition, the NV-center electronic spins can be collectively measured optically to measure J z , but the limited photon collection efficiency limits the readout contrast [31,53,54].…”

Section: Zz Coupling Between the Flux Qubit And Nv-center Electronic Spinsmentioning

confidence: 99%

Preparing Dicke states in a spin ensemble using phase estimation

Wang

Terhal

2021

Phys. Rev. A

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We present a Dicke state preparation scheme which uses global control of N spin qubits: our scheme is based on the standard phase estimation algorithm, which estimates the eigenvalue of a unitary operator. The scheme prepares a Dicke state nondeterministically by collectively coupling the spins to an ancilla qubit via a ZZ interaction, using log 2 N + 1 ancilla qubit measurements. The preparation of such Dicke states can be useful if the spins in the ensemble are used for magnetic sensing: we discuss a possible realization using an ensemble of electronic spins located at diamond nitrogen-vacancy centers coupled to a single superconducting flux qubit. We also analyze the effect of noise and limitations in our scheme.

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“…( 8), we first initialize all NV-center electronic spins in |0 through resonant optical excitations [49], then one performs the global rotation e i π 2 Jy . In addition, the NV-center electronic spins can be collectively measured optically to measure J z , but the limited photon collection efficiency limits the readout contrast [31,51,52].…”

Section: Zz Coupling Between Flux Qubit and Nv Center Electronic Spinsmentioning

confidence: 99%

Preparing Dicke states in a spin ensemble using phase estimation

Wang,

Terhal

2021

Preprint

View full text Add to dashboard Cite

We present a Dicke state preparation scheme which uses global control of N spin qubits: our scheme is based on the standard phase estimation algorithm, which estimates the eigenvalue of a unitary operator. The scheme prepares a Dicke state non-deterministically by collectively coupling the spins to an ancilla qubit via a ZZ-interaction, using log 2 N + 1 ancilla qubit measurements. The preparation of such Dicke states can be useful if the spins in the ensemble are used for magnetic sensing: we discuss a possible realization using an ensemble of electronic spins located at diamond Nitrogen-Vacancy (NV) centers coupled to a single superconducting flux qubit. We also analyze the effect of noise and limitations in our scheme.

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High-efficiency fluorescence collection for NV^- center ensembles in diamond

Cited by 33 publications

References 31 publications

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Preparing Dicke states in a spin ensemble using phase estimation

Preparing Dicke states in a spin ensemble using phase estimation

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High-efficiency fluorescence collection for NV- center ensembles in diamond

Cited by 33 publications

References 31 publications

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Sub-nanotesla magnetometry with a fibre-coupled diamond sensor

Preparing Dicke states in a spin ensemble using phase estimation

Preparing Dicke states in a spin ensemble using phase estimation

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Product

Resources

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High-efficiency fluorescence collection for NV^- center ensembles in diamond