A bidirectional quantum teleportation scheme is presented recently by Ming-huang Sang (Int. J. Theor. Phys. 55, 1333, 2016) via a five-qubit cluster state as quantum channel. In the scheme a special two-qubit entangled state and an arbitrary single-qubit state can be transmitted to each other’s users. In this paper, with the same quantum resources, we put forward an improved scheme, in which the two-qubit non-local operations are not required. In comparison to the original, our improved scheme has some apparent merits, such as lower complexity (intensity and difficulty) of necessary operations, less consumption of classical resources, higher intrinsic efficiency and stronger flexibility of scheme, and so on.

中文翻译：

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通过五量子比特簇状态改进双向量子隐形传态方案

最近，Ming-huang Sang (Int. J. Theor. Phys. 55, 1333, 2016) 提出了一种双向量子隐形传态方案，通过一个五量子位簇态作为量子通道。在该方案中，可以将特殊的双量子位纠缠态和任意单量子位态传输给彼此的用户。在本文中，在相同的量子资源下，我们提出了一种改进方案，其中不需要两个量子位的非本地操作。与原方案相比，我们改进后的方案有一些明显的优点，如必要操作的复杂度（强度和难度）更低，经典资源消耗更少，内在效率更高，方案的灵活性更强等。