论文标题
Majorana Qubit读数中的均值转换
Parity-to-charge conversion in Majorana qubit readout
论文作者
论文摘要
我们研究了马尔可夫读出过程对大小群的时间依赖性效应，其奇偶校验的自由度被转化为隧道耦合量子点的电荷。通过应用最近建立的有效Lindbladian近似[1-3]，我们获得了一个完全正面和痕迹的lindblad主方程，以用于组合点 - Qubit动力学，描述了旋转波近似以外的弛豫和脱谐度过程。这种方法适用于代表实验相关读数设备的各种弱耦合环境。我们详细研究了在存在通用欧姆骨浴的情况下，尤其是电磁回路中的潜在波动。此外，我们考虑使用与点电荷的量子触点耦合的奇偶校验读数的非平衡测量环境。
We study the time-dependent effect of Markovian readout processes on Majorana qubits whose parity degrees of freedom are converted into the charge of a tunnel-coupled quantum dot. By applying a recently established effective Lindbladian approximation [1-3], we obtain a completely positive and trace preserving Lindblad master equation for the combined dot-qubit dynamics, describing relaxation and decoherence processes beyond the rotating-wave approximation. This approach is applicable to a wide range of weakly coupled environments representing experimentally relevant readout devices. We study in detail the case of thermal decay in the presence of a generic Ohmic bosonic bath, in particular for potential fluctuations in an electromagnetic circuit. In addition, we consider the nonequilibrium measurement environment for a parity readout using a quantum point contact capacitively coupled to the dot charge.
