Transporting continuous quantum variables of individual light pulses.
We experimentally demonstrate transporting continuous quantum variables of individual light pulses at telecommunication wavelengths by using continuous-variable Bell measurements and post-processing displacement techniques. Time-domain pulsed homodyne detectors are used in the Bell measurements and the quantum variables of input light are transported pulse-by-pulse. Fidelity of F = 0.57±0.03 is experimentally achieved with the aid of entanglement, which is higher than the bound (F(c) = 0.5) of the classical case in the absence of entanglement.
Department of Physics, Gakushuin University, Tokyo, Japan. eto@qo.phys.gakushuin.ac.jp
Yujiro
Y
Eto
Yun
Y
Zhang
Takuya
T
Hirano
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D011789:Quantum Theory; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications