具有非均匀栅压和磁通量的超导量子点晶格中两量子比特纠缠的坍缩和恢复
Collapse and revival of entanglement of two-qubit in superconducting quantum dot lattice with magnetic flux and inhomogeneous gate voltage
摘要：
研究了在磁通量和门电压不均匀性存在下超导量子点（SQD）晶格中两量子比特系统的纠缠。我们观察到半整数磁通量量子的一个普适特征，它在零温度和有限温度下都能完全消除系统的纠缠。我们观察到当超导量子点晶格中的栅电压不均匀时，基态总是处于最大纠缠Bell态。我们发现了基态纠缠对磁通量的一个重要约束。我们还观察到了与零温行为相反的有限温度下的纠缠行为。
英文摘要：
We study the entanglement of a two-qubit system in a superconducting quantum dot (SQD) lattice in the presence of magnetic flux and gate voltage inhomogeneity. We observe a universal feature for the half-integer magnetic flux quantum which completely washes out the entanglement of the system both at zero and finite temperature. We observe that the ground state is always in a maximally entangled Bell state when there is no inhomogeneity in gate voltage in the superconducting quantum dot lattice. We find an important constraint in magnetic flux for ground state entanglement. We also observe few behavior of entanglement at finite temperature is in contrast with the zero temperature behavior.
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