Superconducting integrated on-demand quantum memory with microwave pulse preservation

• URL: http://arxiv.org/abs/2506.02570v2
• Date: Wed, 30 Jul 2025 15:15:41 GMT
• Title: Superconducting integrated on-demand quantum memory with microwave pulse preservation
• Authors: Aleksei R. Matanin, Nikita S. Smirnov, Anton I. Ivanov, Victor I. Polozov, Daria A. Moskaleva, Elizaveta I. Malevannaya, Margarita V. Androshuk, Yulia A. Agafonova, Denis E. Shirokov, Aleksander V. Andriyash, Ilya A. Rodionov,
• Abstract summary: We present a novel architecture of integrated superconducting quantum memory with a dynamically controlled RF-SQUID coupling element in pulse regime.<n>It demonstrates a memory cycle time of 1.51 $mu s$ and 57.5% storage fidelity with preservation of the stored pulse shape during the retrieval at single-photon level excitations.
• Score: 31.874825130479174
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Microwave quantum memory represents a critical component for quantum radars and resource-efficient approaches to quantum error correction. Superconducting microwave resonators provide highly efficient storage, long coherence times, on-demand reading and even in memory pulse engineering, but it is still challenging to overcome design and materials induced loss channels for on-chip realization. In this work, we present a novel architecture of integrated superconducting quantum memory with a dynamically controlled RF-SQUID coupling element in pulse regime, thus ensuring high efficiency storage and cycling storage time. It demonstrates a memory cycle time of 1.51 $\mu s$ and 57.5% storage fidelity with preservation of the stored pulse shape during the retrieval at single-photon level excitations. We establish that while the proposed active coupler realization introduces no measurable fidelity degradation, the primary limitation arises from impedance matching and materials imperfections. The proposed architecture highlights a disruptive potential for on-chip qubit and memory integration for scalable quantum error correction, while identifying specific avenues for near-unity storage fidelity.

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