Slow and Stored Light via Electromagnetically Induced Transparency Using A $\Lambda$-type Superconducting Artificial Atom

TL;DR

This paper demonstrates slow and stored microwave light using a superconducting artificial atom with electromagnetically induced transparency, advancing quantum memory capabilities in superconducting circuits.

Contribution

It introduces a $ ext{Lambda}$-type superconducting artificial atom enabling slow light and microwave storage, overcoming previous limitations due to lack of metastable states.

Findings

Achieved a group velocity of 3.6 km/s for microwave light.

Demonstrated microwave storage with a memory time of several hundred nanoseconds.

Showcased potential for microwave quantum memory in superconducting circuits.

Abstract

Recent progresses in Josephson-junction-based superconducting circuits have propelled quantum information processing forward. However, the lack of a metastable state in most superconducting artificial atoms hinders the development of photonic quantum memory in this platform. Here, we use a single superconducting qubit-resonator system to realize a desired $\Lambda$-type artificial atom, and to demonstrate slow light with a group velocity of 3.6 km/s and the microwave storage with a memory time extending to several hundred nanoseconds via electromagnetically induced transparency. Our results highlight the potential of achieving microwave quantum memory, promising substantial advancements in quantum information processing within superconducting circuits.