Advanced Ramsey interferometry with tailored pulses

Nitrogen-vacancy (NV) centers in diamond offer a promising solid-state platform for rotation sensing, operating across diverse environmental conditions. Our previous work demonstrated a rotation sensor utilizing 14N nuclear spins, detecting rotation via precession rate shifts [1]. This sensor employs direct optical polarization/readout and radio-frequency double-quantum Ramsey interferometry, eliminating microwave pulses. However, magnetic field, temperature, and RF pulse variations limit long-term stability. <br/> <br/> To enhance robustness, we developed two generalized Ramsey schemes: one utilizing stimulated Raman adiabatic passage (STIRAP) for pulse-area resilience [2], and a dynamical elimination protocol using modulated zero-pulse-area fields to control two-photon transitions and suppress single-photon excitations [3]. Experimental results demonstrate enhanced robustness against pulse parameter variations, yielding improved quantum state generation fidelities and robust Ramsey fringes insensitive to single-photon detuning. <br/> <br/> Our results pave the way for enhanced long-term stability in diamond-based sensors (clocks, gyroscopes, magnetometers), advancing quantum metrology and spectroscopy. Furthermore, we anticipate that the developed two-photon spectroscopy techniques will find widespread application in atomic, molecular, and spin systems, enabling robust control methods for quantum technology, including high-fidelity quantum gates, Ramsey spectroscopy, atom interferometry, and quantum sensing. <br/> <br/> [1] A. Jarmola, S. Lourette, V. M. Acosta, A. G. Birdwell, P. Blümler, D. Budker, T. Ivanov, V. S. Malinovsky, Sci. Adv. 7, eabl3840 (2021). <br/> [2] S. Lourette, A. Jarmola, J. Chathanathil, S. C. Carrasco, D. Budker, S. A. Malinovskaya, A. G. Birdwell, T. G. Ivanov, and V. S. Malinovsky, arXiv:2407.16057 (2024). <br/> [3] S. C. Carrasco, S. Lourette, I. Sola, V. S. Malinovsky, arXiv:2411.05670 (2024).