2026-10-14 スウェーデン王立工科大学（KTH）
＜関連情報＞
- https://www.kth.se/en/om/nyheter/centrala-nyheter/a-new-way-to-detect-stabilizing-properties-of-optical-devices-1.1500813
- https://journals.aps.org/prl/accepted/10.1103/xkht-64kc
プログラム可能な散逸型フォトニック回路における運動量空間トポロジーの干渉計による読み出し Interferometric readout of momentum-space topology in a programmable dissipative photonic circuit
Andrea Cataldo, Emil J. Bergholtz, Daniel Leykam, Jun Gao, and Ali W. Elshaari
Physical Review Letters Accepted: 28 September, 2026
DOI: https://doi.org/10.1103/xkht-64kc
Abstract
Topology under non-Hermitian dynamics is encoded in the phase of the bulk evolution, yet strong dissipation suppresses the amplitudes carrying it. We resolve this using a programmable photonic integrated circuit that implements such dynamics in synthetic momentum space through unitary dilation, with the phase recovered by phase-shifted interferometry. For the non-Hermitian Su-Schrieffer-Heeger model, the protocol distinguishes trivial and non-trivial Zak phases and yields a coherence winding q = ±1 induced by an exceptional point. Extending to a synthetic torus via a Rice-Mele pump gives the first Chern number Ch1 = 0, 1 for trivial and non-trivial cycles, showing a programmable route to momentum-space topology under strongly dissipative non-Hermitian dynamics.
