de Ponte M A, Santos Alan C
Universidade Estadual Paulista (UNESP), Campus Experimental de Itapeva, Rua Geraldo Alckmin, 519, Vila N. Sra de Fátima, 18409-010, Itapeva, São Paulo, Brazil.
Instituto de Física, Universidade Federal Fluminense, Av. General Milton Tavares de Souza s/n, Gragoatá, 24210-346, Niterói, Rio de Janeiro, Brazil.
Sci Rep. 2019 Jul 18;9(1):10470. doi: 10.1038/s41598-019-46902-5.
In this article, we present a quantum transistor model based on a network of coupled quantum oscillators destined to quantum information processing tasks in linear optics. To this end, we show in an analytical way how a set of N quantum oscillators (data-bus) can be used as an optical quantum switch, in which the energy gap of the data bus oscillators plays the role of an adjustable "potential barrier". This enables us to "block or allow" the quantum information to flow from the source to the drain. In addition, we discuss how this device can be useful for implementing single qubit phase-shift quantum gates with high fidelity, so that it can be used as a useful tool. To conclude, during the study of the performance of our device when considering the interaction of this with a thermal reservoir, we highlight the important role played by the set of oscillators which constitute the data-bus in reducing the unwanted effects of the thermal reservoir. This is achieved by reducing the information exchange time (shortening time scale) between the desired oscillators. In particular, we have identified a non-trivial criterion in which the ideal size of the data-bus can be obtained so that it presents the best possible performance. We believe that our study can be perfectly adapted to a large number of thermal reservoir models.
在本文中，我们提出了一种基于耦合量子振荡器网络的量子晶体管模型，旨在用于线性光学中的量子信息处理任务。为此，我们以解析方式展示了一组N个量子振荡器（数据总线）如何用作光量子开关，其中数据总线振荡器的能隙起到可调“势垒”的作用。这使我们能够“阻断或允许”量子信息从源极流向漏极。此外，我们讨论了该器件如何有助于高保真地实现单量子比特相移量子门，从而使其可作为一种有用的工具。最后，在研究我们的器件与热库相互作用时的性能时，我们强调了构成数据总线的振荡器组在减少热库的有害影响方面所起的重要作用。这是通过减少所需振荡器之间的信息交换时间（缩短时间尺度）来实现的。特别是，我们确定了一个重要标准，据此可获得数据总线的理想尺寸，使其呈现出最佳性能。我们相信我们的研究能够很好地适用于大量的热库模型。
