We propose an optimal protocol for remotely preparing a four-qubit entangled state. In this protocol, a sender and two potential receivers share a ten-qubit entangled state. The sender performs a two-qubit state measurement based on the information of the quantum state that needs to be prepared. According to the measurement results of the sender, any potential receiver can obtain the quantum state that the sender needs to prepare by using the corresponding unitary transformation.

中文翻译：

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通过十量子比特纠缠态实现四量子比特纠缠态的最佳远程制备

我们提出了一种远程准备四量子位纠缠状态的最佳协议。在这个协议中，一个发送者和两个潜在的接收者共享一个十量子比特的纠缠状态。发送方根据需要准备的量子态信息进行二量子位态测量。根据发送方的测量结果，任何潜在的接收方都可以通过相应的酉变换得到发送方需要准备的量子态。