Kharkiv Quantum Seminar

Quantum metrology with diamond color centers has advanced through robust protocols like Ramsey interferometry, Hahn-Echo, and Dynamical Decoupling sequences. Unlike other quantum information applications, metrological measurements require interaction with the environment, leading to unavoidable decoherence from environmental noise. Therefore, investigating noise effects on metrology protocols is crucial for advancing quantum-enhanced metrology. Meanwhile, achieving high-sensitivity measurement requires precise estimation of qubit phase shifts in response to external perturbations. In this talk, we examine the impact of noise on a recently proposed post-selection-based protocol that enhances classical Fisher information during the measurement. We demonstrate how to simulate a dissipative channel using an isolated third energy level and outline the fundamental scheme for post-selected quantum parameter estimation. Finally, we present a proof-of-principle demonstration using the NV center in diamond and discuss potential applications for enhancing sensitivity in magnetometry.