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We demonstrate that two four-qubit entangled states can be used to realize the deterministic controlled teleportation of an arbitrary three-qubit state by performing only the Bell-state measurements. [ABSTRACT FROM AUTHOR]

We present a scheme for quantum information splitting of an arbitrary three-qubit state by using a seven-qubit composite GHZ-Bell state as quantum channel. We illustrate the procedure in the ion-trap systems, but the scheme can also be realized in other systems. [ABSTRACT FROM AUTHOR]

We present a scheme for the generation of a genuine four-atom entangled state in Cavity QED. This state has many interesting entanglement properties and wide applications in quantum information processing and fundamental tests of quantum physics. Our scheme is insensitive to both the cavity decay and the thermal field. [ABSTRACT FROM AUTHOR]

We propose a scheme for splitting an arbitrary two-qubit state among three parties by using a six-qubit cluster-class state as a quantum channel. Based on two Bell-state measurements (BSMs) and a two-qubit projective measurement, any one of the two agents can reconstruct the original state if he/she collaborates with the other one, whilst individual agent obtains no information. [ABSTRACT FROM AUTHOR]

We present an experimentally feasible scheme for implementing controlled dense coding through a genuine five-atom entangled state in cavity QED. The scheme is insensitive to both the cavity decay and the thermal field. In the scheme that four-atom entangled states can be exactly distinguished with detecting the atomic state, and the controlled dense coding can be realized in a simple way. [ABSTRACT FROM AUTHOR]

We propose a scheme for implementing the deterministic quantum information splitting (QIS) of an arbitrary three-atom state in cavity QED. In the scheme, a four-atom χ-state and a three-atom GHZ state are used as quantum channel. In comparison with the QIS scheme by using the same quantum channel (Luo and Deng in Quantum. Inf. Process. 12:773, ), our scheme does not involve joint Bell-state measurements, one only needs to perform the single-atom measurements. Our scheme is not sensitive to both the cavity decay and the atom radiation, which is of importance in view of experiment. [ABSTRACT FROM AUTHOR]

A new application of the W-class state is investigated for teleportation of an arbitrary three-qubit state. We demonstrate that three sets of W-class states can be used to realize the perfect teleportation of an arbitrary three-qubit state by performing only the three-qubit von Neumann measurements and local unitary operations. [ABSTRACT FROM AUTHOR]

new application of the four-qubit cluster state is investigated for quantum information splitting (QIS) of an arbitrary N-qubit GHZ-type state among three parties. We demonstrate that a four-qubit cluster state can be used to realize the deterministic QIS of an arbitrary N-qubit GHZ-type state by introducing N−1 ancillary qubits and performing N−1 controlled-NOT operations. The presented protocols considered here are secure against certain eavesdropping attacks. [ABSTRACT FROM AUTHOR]

new application of the genuinely entangled six-qubit state introduced recently by Borras et al. [J. Phys. A 40:13407, ] is investigated for the controlled teleportation of an arbitrary three-qubit state. In our scheme, a genuinely entangled six-qubit state and a Bell-state are shared by a sender (Alice), a controller (Charlie) and a receiver (Bob). Both the sender and the controller only need to perform Bell-state measurements (BSMs), the receiver can reconstruct the arbitrary three-qubit state by performing some appropriate unitary transformations on his qubits after he knows the measured results of both the sender and the controller. This controlled teleportation scheme is deterministic. [ABSTRACT FROM AUTHOR]