量子演算を1000倍高速化し、信頼性の高い量子コンピューティングに前進（1,000 times faster operations bring reliable quantum computing a step closer）

2026-09-10 チャルマース工科大学

Photo: Chalmers University of Technology | Malin Arnesson and Anna-Lena Lundquist.

＜関連情報＞

• https://news.cision.com/chalmers/r/1-000-times-faster-operations-bring-reliable-quantum-computing-a-step-closer,c4393803
• https://journals.aps.org/prl/abstract/10.1103/tnb8-3m8m

量子格子ゲートを用いたボソン符号の単一周期フロケ制御 Single-Period Floquet Control of Bosonic Codes with Quantum Lattice Gates

Tangyou Huang, Lei Du, and Lingzhen Guo
Physical Review Letters  Published: 3 August, 2026
DOI: https://doi.org/10.1103/tnb8-3m8m

Abstract

Bosonic codes constitute a promising route to fault-tolerant quantum computing. Existing Floquet protocols enable analytical construction of bosonic codes but typically rely on slow adiabatic ramps with thousands of driving periods. In this Letter, we circumvent this bottleneck by introducing an analytical and deterministic Floquet method that directly synthesizes arbitrary unitaries within a single period. The phase-space unitary ensembles generated by our approach reproduce the Haar-random statistics, enabling practical pseudorandom states in continuous-variable systems. We prepare various prototypical bosonic codes from vacuum and implement single-qubit logical gates with high fidelities using quantum lattice gates. By harnessing the full intrinsic nonlinearity of Josephson junctions, quantum lattice gates decompose quantum circuits into primitive operations for efficient continuous-variable quantum computing.