Relaxation and decoherence of qubits encoded in collective states of engineered magnetic structures
Relaxation and decoherence of qubits encoded in collective states of engineered magnetic structures
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DOI：
10.1103/physrevb.96.094410
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发表时间：
2017-09-11
影响因子：
3.7
通讯作者：
Ribeiro, Pedro
中科院分区：
文献类型：
--
作者：
Shakirov, Alexey M.;Rubtsov, Alexey N.;Ribeiro, Pedro
只有当一个微观系统与周围环境充分分离时，它的量子本质才能被揭示。与环境的相互作用会引起弛豫和退相干，将量子态转变为经典的混合物。在这里，我们研究了在金属表面上沉积的一组磁原子的集体态中编码的量子比特的这些过程的时间尺度。为此，我们给出了T-1和T-2的常用定义的推广，这些定义表征了松弛和退相干速率。我们计算了几种原子结构的这些量，包括集体自旋，实现无消相干的子空间的设置，以及两个自旋链的例子。我们的工作有助于全面理解弛豫和退相干过程，并展示了在这些装置中实现无退相干的子空间的优势。
The quantum nature of a microscopic system can only be revealed when it is sufficiently decoupled from surroundings. Interactions with the environment induce relaxation and decoherence that turn the quantum state into a classical mixture. Here, we study the timescales of these processes for a qubit encoded in the collective state of a set of magnetic atoms deposited on a metallic surface. For that, we provide a generalization of the commonly used definitions of T-1 and T-2 characterizing relaxation and decoherence rates. We calculate these quantities for several atomic structures, including a collective spin, a setup implementing a decoherence-free subspace, and two examples of spin chains. Our work contributes to the comprehensive understanding of the relaxation and decoherence processes and shows the advantages of the implementation of a decoherence free subspace in these setups.