Modified E91 protocol demonstration with hybrid entanglement photon source
Mikio Fujiwara, Ken-ichiro Yoshino, Yoshihiro Nambu, Taro Yamashita,, Shigehito Miki, Hirotaka Terai, Zhen Wang, Morio Toyoshima, Akihisa Tomita,, and Masahide Sasaki
TL;DR
This paper demonstrates a modified Ekert 91 quantum key distribution protocol using a hybrid entangled photon source, showing successful inequality violation and secure key generation over 20 km fiber.
Contribution
It introduces a hybrid entanglement source combining time-bin and polarization qubits and demonstrates its effectiveness in secure quantum communication.
Findings
Inequality violation confirmed over 20 km fiber
Secure key rate estimated at 70-150 bps
Hybrid entanglement source successfully implemented
Abstract
We report on an experimental demonstration of the modified Ekert 91 protocol of quantum key distribution using a hybrid entanglement source with two different degrees of freedoms, a 1550 nm time-bin qubit and 810 nm polarization qubit. The violation of the Clauser-Horne-Shimony-Holt inequality could be demonstrated for the entanglement between the polarization qubit in free space and the time-bin qubit through 20 km fiber transmission. The secure key rate in our system is estimated 70-150 bps.
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