Abstract
Based on quantum computation, Zhou et al proposed a quantum encryption scheme in 2006. Each qubit of the ciphertext is constrained to two pairs of conjugate states. So its implementation is feasible with the existing technology. But it is inefficient since it entails six key bits to encrypt one message bit, and the resulting ciphertext for one message bit consists of three qubits. In addition, its security can not be directly reduced to the well-known BB84 protocol. In this paper, we revisit it using the technique developed in BB84 protocol. The new scheme entails only two key bits to encrypt one message bit. The resulting ciphertext is just composed of two qubits. It saves about a half cost without the loss of security. Moreover, the encryption scheme is probabilistic other than deterministic.
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