  Two schemes for sharing an arbitrary two-qubit state based on entanglement
swapping are proposed with Bell-state measurements and local unitary
operations. One is based on the quantum channel with four
Einstein-Podolsky-Rosen (EPR) pairs shared in advance. The other is based on a
circular topological structure, i.e., each user shares an EPR pair with his
neighboring one. The advantage of the former is that the construction of the
quantum channel between the agents is controlled by the sender Alice, which
will improve the security of the scheme. The circular scheme reduces the
quantum resource largely when the number of the agents is large. Both of those
schemes have the property of high efficiency as almost all the instances can be
used to split the quantum information. They are more convenient in application
than the other schemes existing as they require only two-qubit entanglements
and two-qubit joint measurements for sharing an arbitrary two-qubit state.
