Coherent transfer via parametric control of normal-mode splitting in a superconducting multimode resonator

TL;DR

This paper demonstrates a controllable microwave quantum memory in a superconducting multimode resonator using parametric modulation to induce tunable normal-mode splitting, enabling on-demand storage and retrieval of microwave pulses.

Contribution

It introduces a novel parametric control method to achieve tunable normal-mode splitting for microwave storage in superconducting circuits, advancing quantum memory technology.

Findings

Achieved large, tunable normal-mode splitting via parametric modulation.

Demonstrated on-demand microwave storage and retrieval.

Showed coherent energy exchange with time-domain beating signals.

Abstract

Microwave storage and retrieval are essential capabilities for superconducting quantum circuits. Here, we demonstrate an on-chip multimode resonator in which strong parametric modulation induces a large and tunable normal-mode splitting that enables microwave storage. When the spectral bandwidth of a short microwave pulse covers the two dressed-state absorption peaks, part of the pulse is absorbed and undergoes coherent energy exchange between the modes, producing a clear time-domain beating signal. By switching off the modulation before the beating arrives, we realize on-demand storage and retrieval, demonstrating an alternative approach to microwave photonic quantum memory. This parametric-normal-mode-splitting protocol offers a practical route toward a controllable quantum-memory mechanism in superconducting circuits.