摘要
A quantum secure direct communication protocol over a collective rotating channel is proposed. The protocol encodes logical bits in noiseless subspaces, and so it can function over a quantum channel subjected to an arbitrary degree of collective rotating noise. Although entangled states are used, both the sender and receiver are only required to perform single-particle product measurement or Pauli operations. The protocol is feasible with present-day technique.
基金
Supported by National Natural Science Foundation of China under Grant Nos. 60873191, 60903152, and 60821001
SRFDP under Grant No. 200800131016
Beijing Nova Program under Grant No. 2008B51
Key Project of Chinese Ministry of Education under Grant No. 109014
China Postdoctoral Science Foundation under Grant No. 20090450018
the Beijing Natural Science Foundation under Grant No. 4072020
