Characterization and correction of the pulse width effects on quantum sensing experiments using solid-state spin qubits

초록

Pulse-level protocols are commonly used in quantum information and sensing experiments. However, finite pulse width, inevitable in many cases due to experimental conditions, can affect the overall performance of the quantum measurement. Here, we study the effect of finite pulse width on quantum sensing experiments based on the solid-state spin qubits: nitrogen-vacancy centers in diamond. We perform magnetic sensing experiments of DC and AC fields using canonical sensing protocols: Ramsey interferometry, Hahn echo, and XY8 dynamical decoupling. By varying the width of pi /2 and pi pulse used in the protocols, we estimate the amount of phase accumulation during the pulses and correct their effects by compensating the qubit evolution time for time offsets due to the phase accumulation. In this way, we are able to recover optimal conditions for maximum sensitivity.

키워드