Functional quantum nodes for entanglement distribution over scalable quantum networks.
We demonstrated entanglement distribution between two remote quantum nodes located 3 meters apart. This distribution involves the asynchronous preparation of two pairs of atomic memories and the coherent mapping of stored atomic states into light fields in an effective state of near-maximum polarization entanglement. Entanglement is verified by way of the measured violation of a Bell inequality, and it can be used for communication protocols such as quantum cryptography. The demonstrated quantum nodes and channels can be used as segments of a quantum repeater, providing an essential tool for robust long-distance quantum communication.
Chou
Chin-Wen
CW
Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, CA 91125, USA.
Laurat
Julien
J
Deng
Hui
H
Choi
Kyung Soo
KS
de Riedmatten
Hugues
H
Felinto
Daniel
D
Kimble
H Jeff
HJ