Ultrasensitive Magnetometer Using a Single Atom

Abstract

Precision sensing, and in particular high precision magnetometry, is a central goal of research into quantum technologies. For magnetometers, often trade-offs exist between sensitivity, spatial resolution, and frequency range. The precision, and thus the sensitivity of magnetometry, scales as $1/\sqrt{T_2}$ with the phase coherence time, $T_2$, of the sensing system playing the role of a key determinant. Adapting a dynamical decoupling scheme that allows for extending $T_2$ by orders of magnitude and merging it with a magnetic sensing protocol, we achieve a measurement sensitivity even for high frequency fields close to the standard quantum limit. Using a single atomic ion as a sensor, we experimentally attain a sensitivity of $4.6$ pT $/\sqrt{Hz}$ for an alternating-current magnetic field near 14 MHz. Based on the principle demonstrated here, this unprecedented sensitivity combined with spatial resolution in the nanometer range and tunability from direct-current to the gigahertz range could be used for magnetic imaging in as of yet inaccessible parameter regimes.

Replaced with final published version. Extended Supplemental Material

References in corpus (7)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Optimized Dynamical Decoupling in a Model Quantum Memory
• Single Ion Quantum Lock-In Amplifier
• Ultrasensitive magnetic field detection using a single artificial atom
• Efficient preparation and detection of microwave dressed-state qubits and qutrits with trapped ions
• Dressed-state amplification by a superconducting qubit
• Universal Set of Gates for Microwave Dressed-State Quantum Computing

Cited by in corpus (59)

• Quantum sensing
• Blueprint for a microwave trapped-ion quantum computer
• Quantum limits to the energy resolution of magnetic field sensors
• Trapped-ion quantum logic with global radiation fields
• Strong coupling of a single ion to an optical cavity
• Towards a deterministic interface between trapped-ion qubits and travelling photons
• Quantum sensing with a single-qubit pseudo-Hermitian system
• Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features
• Review: Quantum Metrology and Sensing with Many-Body Systems
• Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling
• Entanglement-based dc magnetometry with separated ions
• Wide-bandwidth atomic magnetometry via instantaneous-phase retrieval
• Generation of high-fidelity quantum control methods for multi-level systems
• Propagating Quantum Microwaves: Towards Applications in Communication and Sensing
• Synthetic clock transitions via continuous dynamical decoupling
• Sequential measurements for quantum-enhanced magnetometry in spin chain probes
• Quantum parameter estimation in a dissipative environment
• Quantum sensing using imbalanced counter-rotating Bose--Einstein condensate modes
• Integrable quantum many-body sensors for AC field sensing
• Experimental apparatus for overlapping a ground-state cooled ion with ultracold atoms
• Robust optical clock transitions in trapped ions
• Interference in Atomic Magnetometry
• Fully robust qubit in atomic and molecular three-level systems
• Clock transition by continuous dynamical decoupling of a three-level system
• Estimation of gradients in quantum metrology
• Single-ion microwave near-field quantum sensor
• Continuously observing a dynamically decoupled spin-1 quantum gas
• Trapped Rydberg ions: a new platform for quantum information processing
• Atomic Quadrupole Moment Measurement Using Dynamic Decoupling
• Benchmarking Machine Learning Algorithms for Adaptive Quantum Phase Estimation with Noisy Intermediate-Scale Quantum Sensors
• Neural-network-based parameter estimation for quantum detection
• Optimized parameter estimation in the presence of collective phase noise
• A Neural Network Assisted ${}^{171}$Yb${}^{+}$ Quantum Magnetometer
• Versatile Atomic Magnetometry Assisted by Bayesian Inference
• Robust Noise Suppression and Quantum Sensing by Continuous Phased Dynamical Decoupling
• Single-atom transistor as a precise magnetic field sensor
• Quantum sensing of the phase space displacement parameters using a single trapped ion
• Phase-adaptive dynamical decoupling methods for robust spin-spin dynamics in trapped ions
• Quantum parameter estimation of nonlinear coupling in trilinear Hamiltonian with trapped ions
• Decoherence-free radiofrequency dressed subspaces
• Single Spin Detection with Entangled States
• Magnetic coherent population trapping in a single ion
• Enhanced quantum sensing with multi-level structures of trapped ions
• Optimizing quantum sensing networks via genetic algorithms and deep learning
• Coherence of a dynamically decoupled single neutral atom
• Deterministic preparation of a dual-species two-ion crystal
• Multipartite Entanglement and Quantum Sensing in a Spin-5/2 Heisenberg Molecular Iron(III) Triangle
• Decoherence reduction via continuous dynamical decoupling: Analytical study of the role of the noise spectrum
• Scalable surface ion trap design for magnetic quantum sensing and gradiometry
• Adiabatic Quantum Estimation: A Numerical Study of the Heisenberg XX Model with Antisymmetric Exchange
• Quantum Zeno Dynamics of Two Interacting Particles
• Landé $g$ factor measurement of ${}^{48}$Ti${}^{+}$ using simultaneous co-magnetometry and quantum logic spectroscopy
• openMMF: a library for multimode driven quantum systems
• Phase-modulated cavity magnon polaritons as a precise magnetic field probe
• Magnetic Field Detection Using a Two-Qubit System Under Noisy Heisenberg Interaction
• From Quantum Optics to Quantum Technologies
• Discrete time crystal for periodic-field sensing with quantum-enhanced precision
• Efficiency of optimal control for noisy spin qubits in diamond
• Robust applicability of continuous dynamical decoupling to decoherence reduction in longitudinal and transverse-noise settings: The role of anisotropy