A method for transferring an unknown quantum state and its application

作者：Yan Feng Li^*; Huo Hai Rui

来源：Communications in Theoretical Physics, 2007, 47(4): 629-632.

• transferring unknown quantum state
• secure direct communication
• controlled-not operation

We suggest a method for transferring an unknown quantum state. In this method the sender Alice first applies a controlled-not operation on the particle in the unknown quantum state and an ancillary particle which she wants to send to the receiver Bob. Then she sends the ancillary particle to Bob. When Alice is informed by Bob that the ancillary particle. is received,, she performs a local measurement on her particle and sends Bob the outcome of the local measurement via a classical channel. Depending on the outcome Bob can restore the unknown quantum state, which Alice destroyed, on the ancillary particle successfully. As an application of this method we propose a quantum secure direct communication protocol. By introducing the decoy qubits the security of the scheme is guaranteed.

• 出版日期2007-4-15
• 单位河北师范大学