Faithful qubit distribution assisted by one additional qubit against collective noise.
We propose a distribution scheme of polarization states of a single photon over a collective-noise channel. By adding one extra photon with a fixed polarization, we can protect the state against collective noise via a parity-check measurement and postselection. While the scheme succeeds only probabilistically, it is simpler and more flexible than the schemes utilizing decoherence-free subspace. An application to the Bennett-Brassard 1984 protocol through a collective-noise channel, which is robust to the Trojan horse attack, is also given.
Yamamoto
T
T
Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan. yamamoto@mp.es.osaka-u.ac.jp
Shimamura
J
J
Ozdemir
S K
SK
Koashi
M
M
Imoto
N
N