Properties of quantum communication with received quantum state control

Osamu Hirota, Yoshihiro Yoshida, Masao Nakagawa +1 more

Osamu Hirota

Wang Zuo-don

A scheme of multi-party controlled quantum communication of an unknown two-qubit entangled state by using a seven-qubit cluster state as the quantum channel is proposed. In the scheme, the sender set a controller,the controller can not receive the unknown two-qubit entangled state,but he can help the receiver reconstruct the unknown state with the sender. The sender needs to perform a joint von-Neumann measurement on her four qubits,and the controller measures his qubit in the computational basis. The receiver according to the results of two measurement can reconstruct the unknown state by performing appropriate unitary operations. We can set the number of the receiver,and they are constrained by the controller,so as to realize multi-party controlled quantum communication.

Siyu Song, Chuan Xi Wang

Wang Zuo-don

A scheme of controlled hierarchical quantum information of an unknown two-qubit entangled state by using a six-qubit cluster state as the quantum channel is proposed. Because of their different level of trust by the sender,different receivers have different ability to recover the unknown state. The sender needs to perform a joint von-Neumann measurement on her three qubits,controller according to different receivers take a local measurement or a join measurement. After received the two measurements,the receiver can reconstruct the unknown state by performing appropriate unitary operations,then this controlled hierarchical quantum communication is accomplished.

Omar Alshehri, Z.-H. Li, M. Al-Amri