  An efficient high-capacity quantum secret sharing scheme is proposed
following some ideas in quantum dense coding with two-photon entanglement. The
message sender, Alice prepares and measures the two-photon entangled states,
and the two agents, Bob and Charlie code their information on their photons
with four local unitary operations, which makes this scheme more convenient for
the agents than others. This scheme has a high intrinsic efficiency for qubits
and a high capacity.
