A subpicotesla diamond magnetometer

Abstract

Diamond defect centers are promising solid state magnetometers. Single centers allow for high spatial resolution field imaging but are limited in their magnetic field sensitivity to around 10 nT/Hz^(1/2) at room-temperature. Using defect center ensembles sensitivity can be scaled as N^(1/2) when N is the number of defects. In the present work we use an ensemble of 1e11 defect centers for sensing. By carefully eliminating all noise sources like laser intensity fluctuations, microwave amplitude and phase noise we achieve a photon shot noise limited field sensitivity of 0.9 pT/Hz^(1/2) at room-temperature with an effective sensor volume of 8.5e-4 mm^3. The smallest field we measured with our device is 100 fT. While this denotes the best diamond magnetometer sensitivity so far, further improvements using decoupling sequences and material optimization could lead to fT/Hz^(1/2) sensitivity.

11 pages, 3 figures; co-authors added, typos corrected; minor changes to text and figures - results unchanged

References in corpus (10)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• Scalable quantum register based on coupled electron spins in a room temperature solid
• High sensitivity magnetic imaging using an array of spins in diamond
• Dynamical Decoupling of a single electron spin at room temperature
• Tackling Systematic Errors in Quantum Logic Gates with Composite Rotations
• Broadband magnetometry by infrared-absorption detection of nitrogen-vacancy ensembles in diamond
• Ultrasensitive optical magnetometry at the microscale
• Measuring the defect structure orientation of a single NV- centre in diamond
• High-frequency and high-field optically detected magnetic resonance of nitrogen-vacancy centers in diamond

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