Quantum Sensing with Topological-Paired Bound States

Understand

We present an efficient and robust protocol for quantum-enhanced sensing using a single qubit in the topological waveguide system.

• Our method relies on the topological-paired bound states, which are localized near the qubit and can be effectively regarded as a two-level system.
• Through the lens of Bayesian inference theory, we show that the sensitivity can reach the Heisenberg limit across a large field range.
• Inheriting from the topological robustness of the waveguide, our sensing protocol is robust against local perturbations.