Scalable Optical Quantum State Synthesizer with Dual-Mode Resonator Memory
Fumiya Hanamura, Kan Takase, Kazuki Hirota, Rajveer Nehra, Florian Lang, Shigehito Miki, Hirotaka Terai, Masahiro Yabuno, Takahiro Kashiwazaki, Asuka Inoue, Takeshi Umeki, Warit Asavanant, Mamoru Endo, Jun-ichi Yoshikawa, and Akira Furusawa

TL;DR
This paper presents a scalable optical quantum state synthesizer using a dual-mode resonator memory that enables efficient storage, retrieval, and entangling of non-Gaussian states, advancing optical quantum computing and related fields.
Contribution
It introduces a novel dual-mode resonator memory supporting continuous-time storage and entangling operations, demonstrated through scalable generation of non-Gaussian states like cat and GKP states.
Findings
Achieved up to 93% efficiency in storing squeezed single-photon states.
Demonstrated full writing, storage, and readout in an optical resonator memory.
Validated the memory's coherence with T1 = 2.3 μs and Tϕ = 0.96 μs.
Abstract
Optical quantum computing is a promising approach for achieving large-scale quantum computation. While Gaussian operations have been successfully scaled, the inherently weak nonlinearity in optics makes generating highly non-Gaussian states a critical challenge for universality and fault tolerance. Here, we propose and experimentally demonstrate a scalable method to generate optical non-Gaussian states with a resonator-based quantum memory that supports continuous-time storage and retrieval, in contrast to conventional loop-based memories. We introduce a dual-mode operation of the memory, enabling both storage and entangling functionalities within a single device. By employing a time-domain-multiplexed approach, we successfully demonstrate both cat and Gottesman-Kitaev-Preskill (GKP) breeding protocols in a scalable fashion, marking a key step toward quantum error correction. Our…
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