【摘要】 量子逻辑门作为量子计算机的基础元件,在量子计算机中起着非常重要的作用。基于弱克尔交叉非线性效应提出一种新的方案实现双量子比特逻辑门。这种双量子比特逻辑门利用了介质的弱克尔交叉非线性效应、相干叠加态和P零差量子非破坏测量,量子非破坏测量可以判断光子通过的路径从而提高这种量子受控非门的成功概率。和已有的方案相比,该方案提出的量子受控非门具有消耗更少的量子资源,并且在现有的技术条件下就可以实现的优点。更多还原

【Abstract】 Quantum logical gates as basic components play a very important role for quantum computers. A new scheme is proposed to implement the two-qubit logical gates,which is based on weak cross-Kerr nonlinearity. The proposed two-qubit logical gates use medium with cross-Kerr nonlinearities,coherent superposition states and P-homodyne detectors. The probability of the success of these gates can be increased by quantum nondemolition detectors,which are used to judge which paths the signal photons pass through. Compared with the existing ones,the proposed quantum logical gates can increase the feasibility of experimental realization and less resource consumption.更多还原