Robust Noise Suppression and Quantum Sensing by Continuous Phased Dynamical Decoupling.

Area of Science:

• Quantum Information Science
• Quantum Sensing
• Spectroscopy

Background:

• Environmental and amplitude noise limit precision in quantum sensing.
• Standard dynamical decoupling often relies on short pulses, which can be challenging with limited driving power or at high magnetic fields.

Purpose of the Study:

• To propose and experimentally demonstrate a novel quantum sensing technique: continuous phased dynamical decoupling (CPDD).
• To achieve robust compensation of environmental and amplitude noise using CPDD.
• To enhance precision in quantum sensing applications, particularly those with constraints on driving power or high magnetic fields.

Main Methods:

• Application of a continuous driving field with discrete phase changes.
• Implementation of precise timing control for phase changes, surpassing Rabi frequency control.
• Integration of CPDD with quantum heterodyne detection for nanoscale nuclear magnetic resonance.

Main Results:

• Successful demonstration of CPDD for quantum sensing and noise compensation.
• Achieved microhertz uncertainty in estimated signal frequency for a 120-second nanoscale nuclear magnetic resonance measurement.
• Showcased the suitability of CPDD for experiments with limited driving power or at high magnetic fields.

Conclusions:

• CPDD offers a powerful new approach for dynamical decoupling, significantly expanding its applicability.
• The method provides enhanced precision and robustness for quantum sensing.
• Opens new avenues for experiments in systems like nitrogen-vacancy centers, trapped ions, and trapped atoms.