Optical quantum information processing utilizing weak nonlinearities: a little goes a long way
Optical quantum information processing utilizing weak nonlinearities: a little goes a long way
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DOI：
10.1117/12.613614
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发表时间：
2005-08
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影响因子：
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通讯作者：
W. Munro;K. Nemoto;T. Spiller;R. Beausoleil;P. Kok;S. Barrett
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作者：
W. Munro;K. Nemoto;T. Spiller;R. Beausoleil;P. Kok;S. Barrett
已知量子机械地处理信息能够实现传统信息技术（IT）无法访问的新通信和计算场景。已知这种量子处理可以用线性光学技术、测量和前馈来执行。然而，这里的门本质上是概率性的，因此扩大这种方法需要相当多的量子位资源。在这里，我们提出了一种替代的方法，光学QIP的基础上使用弱交叉克尔非线性和高效的零差测量。这种方法能够在光学量子比特之间实现奇偶校验门，由额外的光学探测模式介导，从而实现接近确定性的贝尔状态测量和纠缠门。因此，我们的方法是非常有效的，可扩展的光学QIP的基础，并提供了一种自然的方法来分布这种处理，将其与量子通信相结合。
Processing information quantum mechanically is known to enable new communication and computational scenarios that cannot be accessed with conventional information technology (IT). It is known that such quantum processing can be performed with linear optical techniques, measurement and feed-forward. However, here the gates are intrinsically probabilistic and so scaling up such an approach requires considerable qubit resources. Here we present an alternative approach to optical QIP, based on the use of weak cross-Kerr non-linearities and highly efficient homodyne measurements. This approach enables a parity gate between optical qubits, mediated by an additional optical probe mode, enabling near-deterministic Bell state measurement and entangling gates. Our approach is therefore the basis for very efficient, scalable optical QIP, and provides a natural method for distributing such processing, combining it with quantum communication.