Yao Y, Shao X Q
Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, China and Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China.
Phys Rev E. 2022 Jul;106(1-1):014138. doi: 10.1103/PhysRevE.106.014138.
We study the problem of charging a dissipative one-dimensional XXX spin-chain quantum battery using local magnetic fields in the presence of spin decay. The introduction of quantum feedback control based on homodyne measurement contributes to improving various performances of the quantum battery, such as energy storage, ergotropy, and effective space utilization rate. For the zero-temperature environment, there is a set of optimal parameters to ensure that the spin-chain quantum battery can be fully charged and the energy stored in the battery can be fully extracted under the perfect measurement condition, which is found through the analytical calculation of a simple two-site spin-chain quantum battery and further verified by numerical simulation of a four-site spin-chain counterpart. For completeness, the adverse effects of imperfect measurement, anisotropic parameter, and finite temperature on the charging process of the quantum battery are also considered.
我们研究了在存在自旋衰减的情况下，利用局部磁场对耗散的一维XXX自旋链量子电池进行充电的问题。基于零差测量引入量子反馈控制有助于改善量子电池的各种性能，如能量存储、能质和有效空间利用率。对于零温度环境，存在一组最优参数，通过对一个简单的两比特自旋链量子电池的解析计算发现，在完美测量条件下可确保自旋链量子电池能够完全充电且电池中存储的能量能够被完全提取，并通过对一个四比特自旋链量子电池的数值模拟进一步验证。为了完整起见，还考虑了不完美测量、各向异性参数和有限温度对量子电池充电过程的不利影响。
