Details

Autor(en) / Beteiligte

• Fujiwara, M.
• Toyoshima, M.
• Sasaki, M.
• Yoshino, K.
• Nambu, Y.
• Tomita, A.

Titel

Performance of hybrid entanglement photon pair source for quantum key distribution

Ist Teil von

• Applied physics letters, 2009-12, Vol.95 (26), p.261103-261103-3

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2009

Quelle

American Institute of Physics

Beschreibungen/Notizen

• We report on the experimental demonstration of a source of hybrid entanglement pairs between two different degrees of freedom, a 1550 nm time-bin qubit and an 810 nm polarization qubit. The polarization qubit at 810 nm is transformed by an asymmetric Mach-Zehnder interferometer consisted of a Glan laser prism and a polarization-maintaining fiber. We obtained visibilities of 95.8% and 88% with tolerance ±0.2% and ±1% along Z - Z and X - X axes on the Poincare sphere, respectively, with a coincidence count rate of more than 800 c/s after entanglement format transformation. These values are well above the threshold of 70.7% needed to violate a Bell inequality and allow distilling a secure key in the quantum key distribution.