118 citations · 245 across the 6 of their papers we have counts for
6 papers
Quantum receiver beyond the standard quantum limit of coherent optical communication
Kenji Tsujino, Daiji Fukuda, Go Fujii +4
The most efficient modern optical communication is known as coherent communication and its standard quantum limit (SQL) is almost reachable with current technology. Though it has b…
Sub-shot-noise-limit discrimination of on-off keyed coherent signals via a quantum receiver with a superconducting transition edge sensor
Kenji Tsujino, Daiji Fukuda, Go Fujii +4
We demonstrate a sub-shot-noise-limit discrimination of on-off keyed coherent signals by an optimal displacement quantum receiver in which a superconducting transition edge sensor…
Experimental Determination of the Gain Distribution of an Avalanche Photodiode at Low Gains
Kenji Tsujino, Makoto Akiba, Masahide Sasaki
A measurement system for determining the gain distributions of avalanche photodiodes (APDs) in a low gain range is presented. The system is based on an ultralow-noise charge--sensi…
A multipixel silicon APD with ultralow dark count rate at liquid nitrogen temperature
M. Akiba, K. Tsujino, K. Sato +1
The dark count rate of a multipixel photon counter (MPPC) was reduced to less than 0.2 cps by cooling the counter to 78.5 K. Characteristics of the MPPC other than the dark count r…
Distinguishing genuine entangled two-photon-polarization states from independently generated pairs of entangled photons
Kenji Tsujino, Holger F. Hofmann, Shigeki Takeuchi +1
A scheme to distinguish entangled two-photon-polarization states (ETP) from two independent entangled one-photon-polarization states (EOP) is proposed. Using this scheme, the exper…
Effects of noisy entangled state transmission on quantum teleportation
Holger F. Hofmann, Kenji Tsujino, Shigeki Takeuchi
Quantum teleportation requires the transmission of entangled pairs to Alice and Bob. Transmission errors modify the entangled state before the teleportation can be performed. We de…