Quantum technologies, such as quantum communication, quantum sensing, quantum imaging and quantum computation, need a platform which is flexible, miniaturisable and works at room temperature. Integrated photonics is a promising and fast-developing platform. This requires to develop the right tools to design and fabricate arbitrary photonic quantum devices. Here we present an algorithm which, starting from a n -mode transformation U , designs a photonic device that approximates U . Using this method we design integrated photonic devices which implement quantum gates with high fidelity. Apart from quantum computation, future applications include the design of photonic subroutines and embedded quantum devices. These custom-designed photonic chips will be able to implement a given algorithm as a single-block circuit and will be small, robust and fast compared to a fully-programmable processor.

中文翻译：

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使用FDTD模拟集成光子门

量子技术，例如量子通信，量子感测，量子成像和量子计算，需要一个灵活，小型化并在室温下工作的平台。集成光子学是一个有前途且发展迅速的平台。这就需要开发正确的工具来设计和制造任意光子量子器件。在这里，我们提出一种算法，该算法从模式转换U开始，设计一个近似于U的光子器件。使用这种方法，我们设计了具有高保真度的量子门的集成光子器件。除量子计算外，未来的应用还包括光子例程和嵌入式量子设备的设计。这些定制设计的光子芯片将能够以单块电路的形式实现给定的算法，而且体积小巧，