Robust Magnetometry with Single NV Centers via Two-step Optimization

Abstract

Shallow Nitrogen-Vacancy (NV) centers are promising candidates for high-precision sensing applications; these defects, when positioned a few nanometers below the surface, provide an atomic-scale resolution along with substantial sensitivity. However, the dangling bonds and impurities on the diamond surface result in a complex environment which reduces the sensitivity and is unique to each shallow NV center. To avoid the environment's detrimental effect, we apply feedback-based quantum optimal control. We first show how a direct search can improve the initialization/readout process. In a second step, we optimize microwave pulses for pulsed Optically Detected Magnetic Resonance (ODMR) and Ramsey measurements. Throughout the sensitivity optimizations, we focus on robustness against errors in the control field amplitude. This feature not only protects the protocols' sensitivity from drifts but also enlarges the sensing volume. The resulting ODMR measurements produce sensitivities below 1$\mu$T\,Hz${}^{-\frac{1}{2}}$ for an 83\% decrease in control power, increasing the robustness by approximately one third. The optimized Ramsey measurements produce sensitivities below 100\,nT\,Hz${}^{-\frac{1}{2}}$ giving a two-fold sensitivity improvement. Being on par with typical sensitivities obtained via single NV magnetometry, the complementing robustness of the presented optimization strategy may provide an advantage for other NV-based applications.

arXiv comment16 pages, 11 figures

References in corpus (56)

• Quantum sensing
• Quantum Computing
• The nitrogen-vacancy colour centre in diamond
• High-sensitivity diamond magnetometer with nanoscale resolution
• Sensing electric fields using single diamond spins
• Sensitivity Optimization for NV-Diamond Magnetometry
• NMR Techniques for Quantum Control and Computation
• Training Schrödinger's cat: quantum optimal control
• Temperature dependence of the nitrogen-vacancy magnetic resonance in diamond
• A robust, scanning quantum system for nanoscale sensing and imaging
• High nitrogen-vacancy density diamonds for magnetometry applications
• Avoiding power broadening in optically detected magnetic resonance of single NV defects for enhanced DC-magnetic field sensitivity
• Scanning magnetic field microscope with a diamond single-spin sensor
• Photo induced ionization dynamics of the nitrogen vacancy defect in diamond investigated by single shot charge state detection
• Electronic properties and metrology of the diamond NV- center under pressure
• A 10-qubit solid-state spin register with quantum memory up to one minute
• Nanoscale magnetic imaging of a single electron spin under ambient conditions
• Optimal control technique for Many Body Quantum Systems dynamics
• Chopped random-basis quantum optimization
• Fault-tolerant Quantum Communication with Minimal Physical Requirements
• Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
• Comparing, Optimising and Benchmarking Quantum Control Algorithms in a Unifying Programming Framework
• Spectroscopy of Surface-Induced Noise Using Shallow Spins in Diamond
• Efficient readout of a single spin state in diamond via spin-to-charge conversion
• Spin Properties of Very Shallow Nitrogen Vacancy Defects in Diamond
• Photoelectrical detection of electron spin resonance of nitrogen-vacancy centres in diamond
• Gradient optimization of analytic controls: the route to high accuracy quantum optimal control
• Magnetic measurements on micron-size samples under high pressure using designed NV centers
• Optimized quantum sensing with a single electron spin using real-time adaptive measurements
• Fabrication of all diamond scanning probes for nanoscale magnetometry
• Identifying and mitigating charge instabilities in shallow diamond nitrogen-vacancy centers
• Introduction to Quantum Optimal Control for Quantum Sensing with Nitrogen-Vacancy Centers in Diamond
• Quantum Simulation of Helium Hydride in a Solid-State Spin Register
• Gyroscopes based on nitrogen-vacancy centers in diamond
• Dressing the chopped-random-basis optimization: a bandwidth-limited access to the trap-free landscape
• Nanoscale electrical conductivity imaging using a nitrogen-vacancy center in diamond
• Magnetic domains and domain wall pinning in two-dimensional ferromagnets revealed by nanoscale imaging
• Krotov: A Python implementation of Krotov's method for quantum optimal control
• One decade of quantum optimal control in the chopped random basis
• An information theoretical analysis of quantum optimal control
• Magnetic imaging with an ensemble of Nitrogen Vacancy centers in diamond
• Precise ultra fast single qubit control using optimal control pulses
• Smooth optimal quantum control for robust solid state spin magnetometry
• Optimal control for one-qubit quantum sensing
• Remote optimization of an ultra-cold atoms experiment by experts and citizen scientists
• Widefield imaging of superconductor vortices with electron spins in diamond
• Counteracting systems of diabaticities using DRAG controls: The status after 10 years
• Nanoscale Sensing Using Point Defects in Single-Crystal Diamond: Recent Progress on Nitrogen Vacancy Center-Based Sensors
• High-dynamic-range imaging of nanoscale magnetic fields using optimal control of a single qubit
• Optimized Planar Microwave Antenna for Nitrogen Vacancy Center based Sensing Applications
• Quantum Control for Nanoscale Spectroscopy With Diamond Nitrogen-Vacancy Centers: A Short Review
• Robust and efficient control of spin probes in a complex (biological) environment. Towards sensing of fast temperature fluctuations
• Autonomous Calibration of Single Spin Qubit Operations
• QEngine: An open-source C++ Library for Quantum Optimal Control of Ultracold Atoms
• Noise-robust quantum sensing via optimal multi-probe spectroscopy
• Scanning Diamond NV Center Probes Compatible with Conventional AFM Technology

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• Macroscopic Hyperpolarization Enhanced with Quantum Optimal Control
• Information Theoretical Limits for Quantum Optimal Control Solutions: Error Scaling of Noisy Channels
• Gate-set evaluation metrics for closed-loop optimal control on nitrogen-vacancy center ensembles in diamond
• Model-aware reinforcement learning for high-performance Bayesian experimental design in quantum metrology
• The Role of Bases in Quantum Optimal Control
• Applications of model-aware reinforcement learning in Bayesian quantum metrology
• Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe
• Bichromatic microwave manipulation of the NV center nuclear spin using transition not detectable via optically detected magnetic resonance
• Rapid transform optimisation strategy for decoherence-protected quantum register in diamond
• Efficiency of optimal control for noisy spin qubits in diamond