Regular Article

Phase and amplitude control of microwave pulse in a linear array of superconducting artificial atoms

¹ Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan
² Department of Basic Sciences and Islamiat, University of Engineering and Technology, Peshawar 25120, Pakistan
³ Quantum Optics Lab, Department of Physics, COMSATS University, Islamabad 45650, Pakistan
⁴ Centre for Mathematical Sciences and Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan

^a e-mail: shahid_qamar@pieas.edu.pk

Received: 30 April 2018
Received in final form: 28 August 2018
Published online: 16 October 2018

Abstract

Based on phase controlled electromagnetically induced transparency, we propose a scheme for coherent control and storage of a microwave pulse in a linear array of artificial atoms. In particular, we consider the effects of the amplitude and phase of the fields driving the superconducting artificial atoms attached to a one-dimensional transmission line on the storage of a microwave pulse. We show that controlling the relative-phase of the microwave fields coupling the artificial atoms in a three-level Δ-configuration can yield tunable transparency window, which allows the propagation of a microwave pulse. The amplitude-control of the lower-levels coupling field adds a gain signature to the transparency window. Our results show that the absorption of the probe microwave pulse is suppressed and it gets amplified while propagating through an array of artificial atoms. The group velocity of the probe pulse is considerably reduced as a result atoms in a linear array act as coherent microwave memories.