发表机构
Dipartimento di Fisica, Sapienza Università di Roma（罗马大学物理系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对准粒子中毒下的Majorana四元子量子比特，通过Bloch-Redfield方程推导得到稳态、宇称泄漏率和退相干率的解析表达式，为理解其时域实验数据提供了理论基础。
AI 中文摘要
我们研究了存在外部引线耦合导致的本征准粒子中毒时，Majorana四元子量子比特的耗散动力学。通过描述拥有四个Majorana零模的有限尺寸拓扑超导体的Bloch-Redfield方程，我们得到了在任意充电能量取值下，Majorana量子比特的稳态、宇称泄漏率和退相干率的解析表达式。分析表明，退相位率的指数抑制会被量子比特态的能级劈裂逐渐消除。这些结果有助于理解Majorana量子比特原型中的时域实验数据。
英文摘要
We study the dissipative dynamics of a Majorana tetron qubit in the presence of extrinsic quasiparticle poisoning due to the coupling to external leads. From the Bloch-Redfield equation describing a finite-size topological superconductor hosting four Majorana zero modes and tunnel-coupled to fermionic reservoirs, we recover analytical expressions for the decoherence rate of a Majorana qubit at arbitrary values of the charging energy. The analysis shows that the exponential suppression of the decoherence rate is gradually removed by the energy splitting of the qubit states. These results can be useful to understand time-domain experimental data in Majorana qubit prototypes.
Comments18 pages, 3 figures. v2: updated conclusions and references
