论文标题
量子线性 - Zigzag转变的光谱表征
Spectroscopic Characterization of the Quantum Linear-Zigzag Transition in Trapped Ions
论文作者
论文摘要
虽然工程量子系统是操纵多方量子状态的一般途径，但在足够的控制下，物理系统中访问连续的量子相跃迁提供了固定源纠缠状态的可能性。为此，我们意识到了在线性保罗陷阱中固定的最多五个基态冷却离子的线性 - Zigzag结构过渡的量子版本，我们证明了对临界点附近的纠缠状态干扰法的几个控制要求。使用原位光谱法，我们探测与结构过渡相关的软模式的能级结构和占用，并显示出稳定的临界点和大多数基态职业，跨越了过渡。我们解决了改变过渡性质的陷阱电极不对称引起的偏见，表明它们可以通过改变离子数来抑制它们，并使用光学偶极力来证明对过渡偏置的控制。
While engineered quantum systems are a general route to the manipulation of multipartite quantum states, access in a physical system to a continuous quantum phase transition under sufficient control offers the possibility of an intrinsic source of entangled states. To this end we realize the quantum version of the linear-zigzag structural transition for arrays of up to five ground state-cooled ions held in a linear Paul trap and we demonstrate several of the control requirements towards entangled-state interferometry near the critical point. Using in-situ spectroscopy we probe the energy level structure and occupation of the soft mode associated with the structural transition, and show a stable critical point and majority ground state occupation crossing the transition. We resolve biases arising from trap electrode asymmetries that change the nature of the transition, show that they can be suppressed by varying the ion number, and demonstrate control of the transition bias using optical dipole forces.
