PRESS RELEASE
- Research
- 2025
Ultra-fast real-time observation of optical quantum entanglemet: Pioneering a new era with 1000 times faster quantum entanglement
Quantum entanglement is the most fundamental and indispensable resource for a wide range of quantum technologies, including quantum communication and quantum computing. The generation speed of quantum entanglement is a crucial parameter that determines its practical utility. Conventional quantum entanglement generation operates at speeds in the range of kHz to MHz, significantly slower compared to the GHz clock speeds of classical computers. In this study, we established a high-speed quantum measurement method for multimode quantum entangled states using an optical parametric amplifier, successfully observing quantum entanglement at the timescale of picosecond, which is about 1000 times faster than conventional research. With the technology we have developed, quantum systems with clock speeds in the tens of GHz—surpassing other physical systems and conventional computers—have become possible, opening a new era for ultra-high-speed optical quantum technologies.
(Top) Real-time output of quantum correlations. Correlations at the picosecond timescale can be observed.
(Bottom) Results of quantum correlations in the frequency domain. More than 60-GHz quantum correlations are observed.
Papers
Journal: Nature Photonics
Title: Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing
Authors: Akito Kawasaki*, Hector Brunel, Ryuhoh Ide, Takumi Suzuki, Takahiro Kashiwazaki, Asuka Inoue, Takeshi Umeki, Taichi Yamashima, Atsushi Sakaguchi, Kan Takase, Mamoru Endo, Warit Asavanant, Akira Furusawa*