Barbieri Marco, Spagnolo Nicolò, Ferreyrol Franck, Blandino Rémi, Smith Brian J, Tualle-Brouri Rosa
Dipartimento di Scienze, Università degli Studi Roma Tre, Rome, Italy.
Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy.
Sci Rep. 2015 Oct 15;5:15125. doi: 10.1038/srep15125.
Engineering quantum operations is a crucial capability needed for developing quantum technologies and designing new fundamental physics tests. Here we propose a scheme for realising a controlled operation acting on a travelling continuous-variable quantum field, whose functioning is determined by a discrete input qubit. This opens a new avenue for exploiting advantages of both information encoding approaches. Furthermore, this approach allows for the program itself to be in a superposition of operations, and as a result it can be used within a quantum processor, where coherences must be maintained. Our study can find interest not only in general quantum state engineering and information protocols, but also details an interface between different physical platforms. Potential applications can be found in linking optical qubits to optical systems for which coupling is best described in terms of their continuous variables, such as optomechanical devices.
设计量子操作是开发量子技术和设计新的基础物理测试所需的一项关键能力。在此，我们提出一种方案，用于实现对传播的连续变量量子场执行的受控操作，其功能由一个离散输入量子比特决定。这为利用两种信息编码方法的优势开辟了一条新途径。此外，这种方法允许程序本身处于操作的叠加态，因此它可用于必须保持相干性的量子处理器中。我们的研究不仅在一般量子态工程和信息协议方面具有价值，还详细阐述了不同物理平台之间的接口。在将光学量子比特与光学系统相连接方面可找到潜在应用，对于这些光学系统，其耦合最好用连续变量来描述，比如光机械装置。
