标题： 强耦合超导磁通量子比特与单个铋施主 显示英文标题

标题： Strong coupling of a superconducting flux qubit to single bismuth donors

摘要： 量子计算机的实现由于量子信息的极端脆弱性而代表了巨大的科学和技术挑战。 信息的物理载体，即量子比特或称为qubit，必须同时通过门与其它qubit强耦合以计算信息，且需很好地与环境解耦以保持其量子行为。 在半导体中的磁性杂质，例如硅中的铋施主，是实现此类qubit的一个有趣物理系统。 事实上，与铋施主相关的自旋可以达到极长的相干时间——约为几秒。 然而，在这些自旋之间建立和控制有效的门操作却极其困难。 在这里，我们展示了一种协议，其中单个铋施主可以将其量子信息相干地转移到一个超导通量qubit上，该qubit充当调解者或量子总线。 这种超导设备允许按需连接远处的自旋，对其相干行为的影响很小。 显示英文摘要

摘要： The realization of a quantum computer represents a tremendous scientific and technological challenge due to the extreme fragility of quantum information. The physical support of information, namely the quantum bit or qubit, must at the same time be strongly coupled to other qubits by gates to compute information, and well decoupled from its environment to keep its quantum behavior. An interesting physical system for realizing such qubits are magnetic impurities in semiconductors, such as bismuth donors in silicon. Indeed, spins associated to bismuth donors can reach an extremely long coherence time -- of the order of seconds. Yet it is extremely difficult to establish and control efficient gates between these spins. Here we demonstrate a protocol where single bismuth donors can coherently transfer their quantum information to a superconducting flux qubit, which acts as a mediator or quantum bus. This superconducting device allows to connect distant spins on-demand with little impact on their coherent behavior.