标题： 极性分子离子在低温环境中的高保真量子态控制 显示英文标题

标题： High-fidelity quantum state control of a polar molecular ion in a cryogenic environment

摘要： 我们使用量子逻辑光谱（QLS）协议在低温环境中控制CaH+离子的量子态，在这种环境中，减少的热辐射使旋转态寿命比室温下的寿命延长了一个数量级。 通过反复且自适应地探测分子，通过原子离子检测每次探测的结果，并使用贝叶斯更新方案来量化对分子态的信心，我们展示了单个量子态中的状态制备和测量（SPAM），保真度小于6x10^-3，并测量了两个态之间的拉比振荡，对比度超过99%。 该协议不需要任何特定于分子的激光器，检测方案是无损的。 显示英文摘要

摘要： We use a quantum-logic spectroscopy (QLS) protocol to control the quantum state of a CaH+ ion in a cryogenic environment, in which reduced thermal radiation extends rotational state lifetimes by an order of magnitude over those at room temperature. By repeatedly and adaptively probing the molecule, detecting the outcome of each probe via an atomic ion, and using a Bayesian update scheme to quantify confidence in the molecular state, we demonstrate state preparation and measurement (SPAM) in a single quantum state with infidelity less than 6x10^-3 and measure Rabi flopping between two states with greater than 99% contrast. The protocol does not require any molecule-specific lasers and the detection scheme is non-destructive.