Yao Wang, Liu Ren-Bao, Sham L J
Department of Physics, University of California San Diego, La Jolla, California 92093-0319, USA.
Phys Rev Lett. 2007 Feb 16;98(7):077602. doi: 10.1103/PhysRevLett.98.077602. Epub 2007 Feb 12.
For a two-state quantum object interacting with a slow mesoscopic interacting spin bath, we show that a many-body solution of the bath dynamics conditioned on the quantum-object state leads to an efficient control scheme to recover the lost quantum-object coherence through disentanglement. We demonstrate the theory with the realistic problem of one electron spin in a bath of many interacting nuclear spins in a semiconductor quantum dot. The spin language can be easily generalized to a quantum object in contact with a bath of interacting multilevel quantum units with the caveat that the bath is mesoscopic and its dynamics is slow compared with the quantum object.
对于一个与缓慢的介观相互作用自旋浴相互作用的二态量子物体，我们表明，以量子物体状态为条件的浴动力学多体解导致一种有效的控制方案，通过解纠缠来恢复丢失的量子物体相干性。我们用半导体量子点中许多相互作用的核自旋浴中的一个电子自旋的实际问题来演示该理论。自旋语言可以很容易地推广到与相互作用的多能级量子单元浴接触的量子物体，但需注意浴是介观的，并且其动力学与量子物体相比是缓慢的。
