378 citations · 1.3k across the 23 of their papers we have counts for
3 papers · 2 filters
Planar lightwave circuits for quantum cryptographic systems
Yoshihiro Nambu, Takaaki Hatanaka, Kazuo Nakamura
We propose a quantum cryptographic system based on a planar lightwave circuit (PLC) and report on optical interference experiments using PLC-based unbalanced Mach-Zehnder interfero…
Accuracy of quantum-state estimation utilizing Akaike's information criterion
Koji Usami, Yoshihiro Nambu, Yoshiyuki Tsuda +2
We report our theoretical and experimental investigations into errors in quantum state estimation, putting a special emphasis on their asymptotic behavior. Tomographic measurements…
Single-photon interference experiment over 100 km for quantum cryptography system using a balanced gated-mode photon detector
Hideo Kosaka, Akihisa Tomita, Yoshihiro Nambu +2
We demonstrate single-photon interference over 100 km using a balanced gated-mode photon detector and a plug & play system for quantum key distribution. The visibility with 0.1 pho…