Sagnac interferometry and temporal cloaking via Raman gain

¹ Quantum Optics and Quantum Information Research Group, Department of Physics, University of Malakand Chakdara Dir(L), 18800, Khyber Pakhtunkhwa, Pakistan
² Department of Physics, Abbottabad University of Science and Technology - Havellian, Pakistan
³ Department of Physics Sciences, College of Science, Jazan University - P.O. Box. 114, Jazan 45142, Kingdom of Saudi Arabia
⁴ Department of Physics, College of Science, Princess Nourah bint Abdulrahman University - P.O. Box 84428, Riyadh 11671, Saudi Arabia

Received: 22 February 2025
Accepted: 10 July 2025

Abstract

The phenomenon of temporal cloaking (TC) via Raman gain is explored using Sagnac interferometer (SI) and atomic medium coupling. As a function of the pump field detuning, the temporal gap extends from 6 ms to 20 ms, with the presence of Raman gain in the system. Whereas, with variations in the control field phase angle, a temporal gap of 10 ms is achieved within the system. Similarly, the time delay/advance reaches to ±2 ms and ±5 ms. Additionally, positive and negative improved group refractive index is observed accompanied by negative and positive relativistic group velocities. The presented results may find applications in secure communication, image coding/design, and secure rotation sensing technologies.