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21 papers · 1 filter
Observation of non-Hermitian point gap in photonic crystals
Yuto Moritake, Nozomi Ogawa, Issei Takeda +7
Non-Hermitian point gap (NHPG) is a unique phenomenon in non-Hermitian systems and induces non-Hermitian skin effect (NHSE). In photonic crystals, NHPG and the NHSE have previously…
Narrowband and high-rate entangled photon-pair generation from a high-Q silicon microring resonator
Shoichiro Yasui, Tomohiro Inaba, Hidetaka Nishi +4
Entangled photon-pair sources are indispensable building blocks of quantum information processing technologies. Among the available approaches, on-chip microresonators are particul…
High-gain optical amplification and lasing from erbium-doped single-crystal films epitaxially grown on silicon
Xuejun Xu, Tomohiro Inaba, Takuma Aihara +3
On-chip erbium-doped optical amplifiers and lasers are essential for realizing fully integrated active silicon photonic circuits, but their performance has been limited by the low…
Higher-order exceptional points unveiled by nilpotence and mathematical induction
Kenta Takata, Adam Mock, Masaya Notomi +1
Non-Hermitian systems can have peculiar degeneracies of eigenstates called exceptional points (EPs). An EP of degenerate states is said to have order , and higher-order EPs…
Ultra-high-rate detection of entangled photon pairs
Toshimori Honjo, Shigeyuki Miyajima, Shigehito Miki +5
The high-rate detection of entangled photons is essential for advancing photonic quantum information processing. Although several experimental demonstrations have been reported, th…
Intrinsic ultrafast edge photocurrent dynamics in WTe driven by broken crystal symmetry
Subhashri Chatterjee, Katsumasa Yoshioka, Taro Wakamura +2
Directional photocurrents in two-dimensional materials arise from broken crystal symmetry, offering pathways to high-speed, bias-free photodetection beyond conventional devices. Tu…