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We propose a scheme for perfect quantum teleportation of a special form of four-qubit state by using a six-qubit cluster state as quantum channel. In our scheme, the sender only needs six-qubit von-Neumann projective measurements, and the receiver can reconstruct the original four-qubit state by applying the appropriate unitary operation. [ABSTRACT FROM AUTHOR]

We propose a new protocol of bidirectional quantum controlled teleportation by using a seven-qubit entangled state as the quantum channel. That is to say Alice may transmit an arbitrary single-qubit state to Bob and Bob may transmit an arbitrary two-qubit state to Alice via the control of the supervisor Charlie. [ABSTRACT FROM AUTHOR]

We propose a realizable quantum information splitting scheme for an arbitrary two-qubit state. In our scheme, a genuine six-qubit entangled state is used as quantum channel. The sender and controller only need to perform Bell-state measurements and single-qubit measurements, respectively. The receiver can reconstruct the arbitrary two-qubit state by classical communication and local operations. [ABSTRACT FROM AUTHOR]

We propose a scheme for asymmetric bidirectional controlled teleportation by using a six-qubit cluster state as quantum channel. In our scheme, Alice can transmit an arbitrary two-qubit entangled state to Bob and at the same time Bob can teleport an arbitrary single-qubit state to Alice under the control of the supervisor Charlie. [ABSTRACT FROM AUTHOR]

We propose an experimentally feasible scheme for implementing controlled quantum secure direct communication by using six-qubit entangled states. According to the results measured by the sender and the controller, the receiver can obtain different secret messages in a deterministic way with unit successful probability. In our scheme, the information-carrying qubits do not need to be transmitted over the public channel. Therefore, the scheme is determinate and secure. [ABSTRACT FROM AUTHOR]