论文标题
在量子光学电路模拟中实现光子部分区分性
Implementation of photon partial distinguishability in a quantum optical circuit simulation
论文作者
论文摘要
我们关注的是在某些现实条件下对量子光电电路的数值模拟，特别是光子量子状态并非完全没有区别。部分光子可区分性在实施光学量子信息处理方面有一个严重的限制。为了正确评估其对量子信息协议的影响，紧密模拟量子电路操作的准确数值模拟至关重要。我们的具体目标是提供一项计算机实现的部分光子可区分性，该分子原则上适用于用于理想量子电路的现有仿真技术，并避免了其重大修改的需求。我们的方法是基于革兰氏式正统计的过程，该过程非常适合我们的目的。光子量子状态由波袋表示，其中包含有关其时间和频率分布的信息。为了说明部分光子的区分性，我们扩大了与电路操作相关的自由度的数量，扩展了光子通道的定义，以结合波袋的自由度。该策略允许将延迟操作定义与线性光学元素相同的基础。
We are concerned with numerical simulations of quantum optical circuits under certain realistic conditions, specifically that photon quantum states are not perfectly indistinguishable. The partial photon distinguishability presents a serious limitation in implementation of optical quantum information processing. In order to properly assess its effect on quantum information protocols, accurate numerical simulations, which closely emulate quantum circuit operations, are essential. Our specific objective is to provide a computer implementation of the partial photon distinguishability which is in principle applicable to existing simulation techniques used for ideal quantum circuits and which avoids a need for their significant modification. Our approach is based on the Gram-Schmidt orthonormalization process, which is well suited for our purpose. Photonic quantum states are represented by wavepackets which contain information on their time and frequency distributions. In order to account for the partial photon distinguishability, we expand the number of degrees of freedom associated with the circuit operation extending the definition of the photon channels to incorporate wavepacket degrees of freedom. This strategy allows to define delay operations in the same footing as the linear optical elements.
