Bosonic Noise Suppression with Qumode-Qubit Rotations
Invited Talk
S U Shringarpure1, S Park1, S Cho1, Y S Teo2, H Kwon3, S Omkar1, H Jeong1
1 IRC NextQuantum, Department of Physics and Astronomy, Seoul National University, Seoul, South Korea
2 Department of Quantum Information Science and Engineering, Sejong University, Seoul, South Korea
3 School of Computational Sciences, Korea Institute for Advanced Studies, Seoul, South Korea
Seminar: S7 — Quantum Information Science
Monday, 6 July 2026 · 16:00 – 16:35
Abstract
Bosonic-noise suppression is crucial for reliable continuous-variable (CV) quantum computation. We propose a feasible interferometric protocol to suppress thermal and displacement noise in bosonic codes using conditional-Fourier (CF) rotation gates that entangle the bosonic mode to an (DV) atomic ancilla. Our protocol is both code- and noise-parameter independent and shows that near-unit suppression fidelities are achievable with greater-than-half success probabilities for reasonable noise rates. Moreover, for even bosonic-code choices, a single CF gate is sufficient to achieve such high fidelities that remain completely resilient to DV ancilla amplitude- and phase-damping noise, which is typical in cavity-atomic systems—a huge practical advantage compared to previous methods.