qubit

a new protocol of quantum secret sharing for single qubit through an entangled w state is proposed.

提出用纠缠W态来完成单个量子位的量子秘密分享方案。

the quantum information of each qubit is encoded on the degenerate ground states of the atom, so the entanglement between them is relatively stable against spontaneous emission.

量子信息编码在原子的简并基态能级上，从而使得制备的原子纠缠态在抗自发辐射方面具有很好的稳定性。

a two-level quantum system is a quantum bit ( qubit).

一个双态量子体系即量子比特。

where a classical bit must be either 0 or 1, a quantum bit, called a qubit, can be 0 or 1-or, crucially, a mixture of both.

一个二进制位（bit）上的数字非“0”即“1”；而一个量子位（qubit）上的数字可是“0”可是“1”——关键的来了，还可既是“0”又是“1”。

and as long as the hot qubit stays hot, this quantum fridge continues to work.

只要保持热的热量子比特，这个量子冰箱继续工作。

so if we apply mix() twice to any qubit ( in any state) we get back to where we started.

因此如果我们对任意量子位（处于任何状态）应用两次Mix（），我们就回到了开始的地方。

since any logic gate can be constructed by two-qubit controlled not gates ( cn gate) and one qubit rotation gate ( r gate), the realization of the cn and r gates has been studied extensively.

任意量子门都可以由二比特控制非门（CN门）和单比特旋转门（R门）组成。因此，人们致力于研究如何实现CN门和R门。

two-level atom has been regarded as an important principal candidate for quantum bit ( qubit), recently. the atomic entangled states are a part of the vital resources in quantum information processes such as quantum teleportation, quantum information storage, etc.

二能级原子是量子比特（Qubit）的重要候选者，纠缠的二能级原子体系是实现量子信息存储、量子隐形传态等量子信息过程的重要资源。

Ideal dense coding protocols allow one to use prior maximal entanglement to send two bits of classical information by the physical transfer of a single encoded qubit.

在理想的超密编码方案中，发送方凭借一个和接收方共享的最大纠缠纯态，可用传送一量子比特来实现传送两经典比特的信息。

not() applied again to the same qubit will undo the effect of the first which is exactly what we would expect from classical computing.

再次对同一量子位使用Not（）将撤消第一次的结果，这正是我们在经典计算中所预期的。