The no-masking theories show that it is impossible to mask the set of all qubit states into the quantum correlation of bipartite qubit system or tripartite qubit system. In this paper, we give a new proof of the no-masking situation of the tripartite qubit system. Recent work has shown that there exists a universal masker which can mask an arbitrary set of qubit states in four-qubit systems perfectly by means of the maximum entangled states. Here we show that there exist more than one masking scheme even for the same multipartite qubit system. Basing on the maximum entangled states we give the deterministic masking scenario for N-qubit system. In practice, decoherence hinders us from obtaining the maximum entangled states. From this viewpoint, the masking scenario based on non-maximum entangled states becomes more universal. Furthermore, we provide an approximate quantum masking scenario and investigate the relation between approximate masking and quantum entanglement.

中文翻译：

---

多方量子比特系统中的量子比特掩蔽

无掩蔽理论表明，不可能将所有量子比特状态的集合掩蔽成二分量子比特系统或三分量子比特系统的量子相关性。在本文中，我们对三方量子比特系统的无掩蔽情况给出了新的证明。最近的工作表明，存在一种通用掩蔽器，它可以通过最大纠缠态完美地掩蔽四量子位系统中的任意一组量子位态。在这里，我们表明即使对于相同的多部分量子比特系统，也存在不止一种掩蔽方案。基于最大纠缠态，我们给出了确定性掩蔽方案ñ-量子位系统。在实践中，退相干阻碍了我们获得最大纠缠态。从这个角度来看，基于非最大纠缠态的掩蔽场景变得更加普遍。此外，我们提供了一个近似的量子掩蔽方案，并研究了近似掩蔽与量子纠缠之间的关系。