论文标题
通过光子辅助Landau-Zener-Stückelberg干涉法的产生
Generation of Schrödinger cat states through photon-assisted Landau-Zener-Stückelberg interferometry
论文作者
论文摘要
SchrödingerCat状态对于许多应用都有用，从量子信息处理到高精度测量。在本文中，我们提出了一种基于光子辅助的Landau-Zener-Stückelberg干涉测量的概念上的新方法，以创建此类猫状态。我们表明，通过在其基本状态之一初始化量子量，连续三个跨量子能量分裂的量子能量分裂，并最终将Qubit投射到相同的基础状态，可以将光子场的奇偶校验纯化至很高的程度；当最初的光子状态是连贯的状态时，最终状态将非常接近schrödinger猫状态。我们提供了数值模拟，以确认我们的协议可以适用于合理尺寸的连贯状态（$ |α|^2 \ sim 10 $）的高保真度（$ \ sim 0.99 $）。此外，我们建议我们的方案也可以用于在腔体中正交猫状态的量子和叠加之间传递量子信息。
Schrödinger cat states are useful for many applications, ranging from quantum information processing to high-precision measurements. In this paper we propose a conceptually new method for creating such cat states, based on photon-assisted Landau-Zener-Stückelberg interferometry in a hybrid system consisting of a qubit coupled to a photon cavity. We show that by initializing the qubit in one of its basis states, performing three consecutive sweeps of the qubit energy splitting across the 1-photon resonance, and finally projecting the qubit to the same basis state, the parity of the photon field can be purified to very high degree; when the initial photon state is a coherent state, the final state will then be very close to a Schrödinger cat state. We present numerical simulations that confirm that our protocol could work with high fidelity ($\sim 0.99$) for coherent states of reasonable size ($|α|^2 \sim 10$). Furthermore, we suggest that our protocol can also be used to transfer quantum information between the qubit and a superposition of orthogonal cat states in the cavity.
