Ultrafast all-optical quantum teleportation
Takumi Suzuki, Takaya Hoshi, Akito Kawasaki, Shotaro Oki, Konhi Ichii, Hironari Nagayoshi, Kazuma Takahashi, Takahiro Kashiwazaki, Taichi Yamashima, Asuka Inoue, Takeshi Umeki, Tatsuki Sonoyama, Kan Takase, Warit Asavanant, Mamoru Endo, Akira Furusawa

TL;DR
This paper demonstrates ultrafast all-optical quantum teleportation at terahertz bandwidths, surpassing classical limits and enabling quantum information processing at unprecedented speeds.
Contribution
It introduces a method for all-optical quantum teleportation that bypasses electronic bottlenecks, achieving terahertz-bandwidth quantum state transfer.
Findings
Successfully teleported vacuum states across the terahertz band.
Achieved teleportation fidelities of 0.784 and 0.770 for different states.
Surpassed the classical fidelity limit of 0.5.
Abstract
Light's intrinsic carrier frequency of hundreds of terahertz theoretically enables information processing at terahertz clock rates. In optical quantum computing, continuous-variable quantum teleportation is the fundamental building block for deterministic logic operations. This protocol transfers unknown quantum states between nodes using quantum entanglement and real-time feedforward of measurement outcomes. However, electrical feedforward bottlenecks currently restrict operational bandwidths to approximately 100 megahertz, preventing the exploitation of light's ultimate speed. Here we show 1-terahertz-bandwidth all-optical quantum teleportation, completely bypassing this electronic limitation. By transferring Bell measurement outcomes optically, we successfully teleported vacuum states across the terahertz band and real-time random coherent wavepackets with a 42-picosecond temporal…
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