[17p-S4_203-1~12] 3.9 Optical quantum physics and technologies

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)

[17p-S4_203-2] [The 10th Photonics Encouragement Award　Speech] Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing

〇Akito Kawasaki^1,2,3, Brunel Hector^2,4, Ryuhoh Ide², Takumi Suzuki², Takahiro Kashiwazaki⁵, Asuka Inoue⁵, Takeshi Umeki⁵, Taichi Yamashima^2,5, Atsushi Sakaguchi³, Kan Takase^1,2,3, Mamoru Endo^2,3, Warit Asavanant^1,2,3, Akira Furusawa^1,2,3 (1.OptQC, 2.The Univ. of Tokyo, 3.RIKEN RQC, 4.ENS, 5.NTT Device Technology Labs)

Keywords:

Quantum optics,Quantum entanglement,Quantum computing

Real-time measurement of entanglement is essential for accelerating optical quantum computing, but conventional homodyne detection bandwidth has been a bottleneck. This study developed a high-speed homodyne detection system using synchronized dual-channel phase-sensitive amplification to achieve high-speed measurement of EPR states. We observed a 4.7 dB quantum correlation at picosecond-scale resolution, achieving a 1000-fold speed increase over conventional methods. This achievement is a vital step toward ultra-fast optical quantum computation.