本論文詳細介紹了超導電路中第一個基於電磁誘發透明的微波量子記憶體的動機、理論背景、數值模擬、設計、實現和測量結果。;Recent progress in Josephson-junction-based superconducting circuits has significantly advanced quantum information processing. To build a comprehensive superconducting-based quantum network, one requires a critical ingredient: microwave quantum memory. However, the development of photonic quantum memory on this platform is hindered by the absence of a metastable state in most superconducting artificial atoms.
In this thesis, we theoretically investigate and experimentally realize a novel type of microwave memory within the waveguide quantum electrodynamics architecture, consisting of a single superconducting Xmon qubit and a coupling high-quality resonator. This resonator can be considered a suitable metastable state for the circuit. By employing the parametric modulation technique, the synergy effect of modulating the qubit transition frequency and directly driving the qubit transition with a microwave can create an effective three-level Λ-type electromagnetically induced transparency. The accompanying dispersion profile is sharply modified under the continuous parametric modulation, resulting in the probe pulse passing through this single Λ-type artificial atom at a reduced group velocity of 3.6 km/s. We demonstrate that the dynamical control of such a parametric modulation allows for on-demand microwave storage and retrieval, with a memory time extending to several hundred nanoseconds via electromagnetically induced transparency. This simple yet versatile device highlights the potential of achieving microwave quantum memory within the superconducting circuits community.
This thesis details the motivation, theoretical background, numerical simulations, design, implementation, and measurement results of this first electromagnetically-induced-transparency-based microwave quantum memory device in superconducting circuits.
