Arjmandi Mohammad B, Mohammadi Hamidreza, Santos Alan C
Faculty of Physics, University of Isfahan, P.O. Box 81746-7344, Isfahan, Iran.
Quantum Optics Research Group, University of Isfahan, Isfahan, Iran.
Phys Rev E. 2022 May;105(5-1):054115. doi: 10.1103/PhysRevE.105.054115.
One of the most important devices emerging from quantum technology are quantum batteries. However, self-discharging, the process of charge wasting of quantum batteries due to decoherence phenomenon, limits their performance, measured by the concept of ergotropy and half-life time of the quantum battery. The effects of local field fluctuation, introduced by the disorder term in the Hamiltonian of the system, on the performance of the quantum batteries is investigated in this paper. The results reveal that the disorder term could compensate disruptive effects of the decoherence, i.e., self-discharging, and hence improve the performance of the quantum battery via "incoherent gain of ergotropy" procedure. Adjusting the strength of the disorder parameter to a proper value and choosing a suitable initial state of the quantum battery, the amount of free ergotropy, defined with respect to the free Hamiltonian, could exceed the amount of initial stored ergotropy. In addition harnessing the degree of the disorder parameter could help to enhance the half-life time of the quantum battery. This study opens perspective to further investigation of the performance of quantum batteries that explore disorder and many-body effects.
量子电池是量子技术中涌现出的最重要的器件之一。然而，自放电，即由于退相干现象导致量子电池电荷浪费的过程，限制了它们的性能，量子电池的性能通过能熵概念和半衰期来衡量。本文研究了系统哈密顿量中的无序项引入的局部场涨落对量子电池性能的影响。结果表明，无序项可以补偿退相干的破坏效应，即自放电，从而通过“能熵的非相干增益”过程提高量子电池的性能。将无序参数的强度调整到适当的值并选择量子电池的合适初始状态，相对于自由哈密顿量定义的自由能熵量可能会超过初始存储的能熵量。此外，控制无序参数的程度有助于提高量子电池的半衰期。这项研究为进一步探索无序和多体效应的量子电池性能研究开辟了前景。
