课题组演示了两种主要范式之间的量子信息转换，即离散和连续变量量子位。研究组在一组完整的单光子量子位上验证了该协议，成功地将它们转换为猫态量子位，保真度超过了经典极限。该项研究有望推动互连量子器件和架构，呈现增强的多功能性和可扩展性。
据介绍，从电信到计算体系结构，经典信息领域依赖于转换器技术，以实现数字和模拟格式之间的数据交换，这一过程现在通常在各种电子设备上执行。在量子信息技术领域也存在类似的迫切需求，人们正在为量子计算、通信和传感开发不同的框架。因此，高效的量子互连是将这些并行方法结合在一起并扩大量子信息系统规模的主要需求。然而，到目前为止，因难以保证量子叠加，以及后选择自由实现的苛刻要求，不同光学量子位编码之间的转换仍然极具挑战。
附：英文原文
Title: A quantum-bit encoding converter
Author: Darras, Tom, Asenbeck, Beate Elisabeth, Guccione, Giovanni, Cavaills, Adrien, Le Jeannic, Hanna, Laurat, Julien
Issue&Volume: 2022-12-22
Abstract: From telecommunications to computing architectures, the realm of classical information hinges on converter technology to enable the exchange of data between digital and analogue formats, a process now routinely performed across a variety of electronic devices. A similar exigency also exists in quantum information technology, where different frameworks are being developed for quantum computing, communication and sensing. Thus, efficient quantum interconnects are a major need to bring these parallel approaches together and scale up quantum information systems. So far, however, the conversion between different optical quantum-bit encodings has remained challenging due to the difficulty of preserving fragile quantum superpositions and the demanding requirements for postselection-free implementations. Here we demonstrate such a conversion of quantum information between the two main paradigms, namely discrete- and continuous-variable qubits. We certify the protocol on a complete set of single-photon qubits, successfully converting them to cat-state qubits with fidelities exceeding the classical limit. Our result demonstrates an essential tool for enabling interconnected quantum devices and architectures with enhanced versatility and scalability.
DOI: 10.1038/s41566-022-01117-5
Source: https://www.nature.com/articles/s41566-022-01117-5