三量子比特纠缠Greenberger-Horne-Zeilinger态和W态的量子线路实现

两个简单的量子线路被提出分别用来制备三量子比特Greenberger-Horne-Zeilinger(GHZ)态和W态。众所周知,任意的多量子比特门都可以由受控非门和单量子比特门复合而成。同样,我们发现三量子比特GHZ态和W态也可以由受控非门和单量子比特门来制备。因此,从量子计算的角度来看我们的方案十分重要。由于在整个过程只用到了单量子比特操作和双量子比特操作,所以我们的方案在实验中很容易实现。

The Networks for Preparation of Three-qubit Greenberger-Horne-Zeilinger and W State

Two simple networks are proposed for preparation of three-qubit Greenberger-Horne-Zeilinger and W state, respectively. It is known that the multi-qubit quantum gate can be constructed by controlled NOT gate and single-qubit operation. In the same way, we find that the three-qubit Greenberger-Horne-Zeilinger and W state can also be constructed by controlled NOT gate and single-qubit operation, which is important in the view of quantum computation. Due to the single and two-qubit operations being used only in the whole process, our scheme can be easily implemented in experiment.