All linear optical quantum memory based on quantum error correction.
When photons are sent through a fiber as part of a quantum communication protocol, the error that is most difficult to correct is photon loss. Here we propose and analyze a two-to-four qubit encoding scheme, which can recover the loss of one qubit in the transmission. This device acts as a repeater, when it is placed in series to cover a distance larger than the attenuation length of the fiber, and it acts as an optical quantum memory, when it is inserted in a fiber loop. We call this dual-purpose device a "quantum transponder."
Gingrich
Robert M
RM
Quantum Computing Technologies Group, Section 367, California Institute of Technology, MS 126-347, 4800 Oak Grove Drive, California 91109-8099, USA.
Kok
Pieter
P
Lee
Hwang
H
Vatan
Farrokh
F
Dowling
Jonathan P
JP