title: Entanglement of light-shift compensated atomic spin waves with telecom light.
abstract: Entanglement of a 795 nm light polarization qubit and an atomic Rb spin-wave qubit for a storage time of 0.1 s is observed by measuring the violation of Bell's inequality (S=2.65±0.12). Long qubit storage times are achieved by pinning the spin wave in a 1064 nm wavelength optical lattice, with a magic-valued magnetic field superposed to eliminate lattice-induced dephasing. Four-wave mixing in a cold Rb gas is employed to perform light qubit conversion between near infrared (795 nm) and telecom (1367 nm) wavelengths, and after propagation in a telecom fiber, to invert the conversion process. Observed Bell inequality violation (S=2.66±0.09), at 10 ms storage, confirms preservation of memory-light entanglement through the two stages of light qubit frequency conversion.
authors.affiliation: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
authors.forename: Y O
authors.initials: YO
authors.lastname: Dudin
authors.forename: A G
authors.initials: AG
authors.lastname: Radnaev
authors.forename: R
authors.initials: R
authors.lastname: Zhao
authors.forename: J Z
authors.initials: JZ
authors.lastname: Blumoff
authors.forename: T A B
authors.initials: TA
authors.lastname: Kennedy
authors.forename: A
authors.initials: A
authors.lastname: Kuzmich