论文标题
快速高保真量子门的平行选择性核旋转地址
Parallel selective nuclear spin addressing for fast high-fidelity quantum gates
论文作者
论文摘要
由于它们的连贯性时间很长，核自旋已成为物理Qubt的大量关注。不同谐振频率的核自旋之间的两倍大门可以由电子旋转介导，通常采用一系列电子核门。在这里，我们提出了一种不同的方法，灵感来自但不限于钻石中的NV中心，并讨论了可能的应用。为此，我们将外部电子自旋控制序列推广用于核自旋初始化和超极化，以通过电子自旋同时控制不同的核自旋。这种方法导致有效的纠缠大门，与标准技术相比，当栅极时间受到非谐振耦合限制与其他自旋的限制时，栅极时间将超过50％，当栅极时间受到小型电子核核耦合限制时，高达22％。
Due to their long coherence times, nuclear spins have gained considerable attention as physical qubits. Two-qubit gates between nuclear spins of distinct resonance frequencies can be mediated by electron spins, usually employing a sequence of electron-nuclear gates. Here we present a different approach inspired by, but not limited to, NV centers in diamond and discuss possible applications. To this end we generalize external electron spin control sequences for nuclear spin initialization and hyperpolarization to achieve the simultaneous control of distinct nuclear spins via an electron spin. This approach results in efficient entangling gates that, compared to standard techniques, reduce the gate time by more than 50% when the gate time is limited by off-resonant coupling to other spins, and by up to 22% when the gate time is limited by small electron-nuclear coupling.
