论文标题
在约瑟夫森连接链中保护量子信息
Protection of quantum information in a chain of Josephson junctions
论文作者
论文摘要
对称的考虑是我们理解自然基本定律的关键。对称性的存在意味着物理系统在特定的转换下是不变的，并且这种不变性可能会产生深远的后果。例如，对称性论点指出，如果对动作的激励措施同样平衡，则系统将保持其初始状态。在这里，我们将此原理应用于一系列Qubits，并表明可以设计其哈密顿量的对称性，以便保持量子信息内在地保护量子，从而免受放松和反折叠的影响。我们表明，相对于其各个组件的相互关系，该系统的相干性能得到了强大的增强。可以使用简单的体系结构来实现此类Qubit链，该体系结构由相对较少的超导约瑟夫森连接组成。
Symmetry considerations are key towards our understanding of the fundamental laws of Nature. The presence of a symmetry implies that a physical system is invariant under specific transformations and this invariance may have deep consequences. For instance, symmetry arguments state that a system will remain in its initial state if incentives to actions are equally balanced. Here, we apply this principle to a chain of qubits and show that it is possible to engineer the symmetries of its Hamiltonian in order to keep quantum information intrinsically protected from both relaxation and decoherence. We show that the coherence properties of this system are strongly enhanced relative to those of its individual components. Such a qubit chain can be realized using a simple architecture consisting of a relatively small number of superconducting Josephson junctions.
