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SFQ counter-based precomputation for large-scale cryogenic VQE machines
Yosuke Ueno, Satoshi Imamura, Yuna Tomida +5
The variational quantum eigensolver (VQE) is a promising candidate that brings practical benefits from quantum computing. However, the required bandwidth in/out of a cryostat is a…
Inter-temperature Bandwidth Reduction in Cryogenic QAOA Machines
Yosuke Ueno, Yuna Tomida, Teruo Tanimoto +4
The bandwidth limit between cryogenic and room-temperature environments is a critical bottleneck in superconducting noisy intermediate-scale quantum computers. This paper presents…
NEO-QEC: Neural Network Enhanced Online Superconducting Decoder for Surface Codes
Yosuke Ueno, Masaaki Kondo, Masamitsu Tanaka +2
Quantum error correction (QEC) is essential for quantum computing to mitigate the effect of errors on qubits, and surface code (SC) is one of the most promising QEC methods. Decodi…
Coherent coupling between ferromagnetic magnon and superconducting qubit
Yutaka Tabuchi, Seiichiro Ishino, Atsushi Noguchi +4
Rigidity of an ordered phase in condensed matter results in collective excitation modes spatially extending in macroscopic dimensions. Magnon is a quantum of an elementary excitati…
Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
Yutaka Tabuchi, Seiichiro Ishino, Toyofumi Ishikawa +3
We demonstrate large normal-mode splitting between a magnetostatic mode (the Kittel mode) in a ferromagnetic sphere of yttrium iron garnet and a microwave cavity mode. Strong coupl…