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Quantum memory in an effective $Λ$-type system using dynamic detuning control of a superconducting qubit pair

Year: 2026

Type: preprint

Abstract: We theoretically investigate quantum-light storage in an effective $Λ$-type system formed by a pair of tunable superconducting qubits coupled to a semi-infinite transmission line and separated by half a wavelength. The frequency detuning between the qubits directly couples the superradiant excited state and the subradiant metastable state. By adjusting the qubit detuning, the system exhibits a controllable spectral response accompanied by slow-light behavior. Dynamically controlling the detuning enables an incident quantum field to be mapped onto the subradiant collective state, stored as a long-lived excitation, and subsequently retrieved on demand. Our results establish the proposed system as a minimal and tunable quantum-memory architecture for scalable superconducting quantum networks.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.34201

Authors: Chang, Hsin, Chu, Kai-I, Yu, Ite A., Lin, Yen-Hsiang, Chen, Yung-Fu

Institutions: National Central University, Massachusetts Institute of Technology, The University of Tokyo

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: National Science and Technology Council

OpenAlex ID: W7214753567

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