Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2011 Nov 11;107(20):206806. doi: 10.1103/PhysRevLett.107.206806. Epub 2011 Nov 8.
We present a scheme for achieving coherent spin squeezing of nuclear spin states in semiconductor quantum dots. The nuclear polarization dependence of the electron spin resonance generates a unitary evolution that drives nuclear spins into a collective entangled state. The polarization dependence of the resonance generates an area-preserving, twisting dynamics that squeezes and stretches the nuclear spin Wigner distribution without the need for nuclear spin flips. Our estimates of squeezing times indicate that the entanglement threshold can be reached in current experiments.
我们提出了一种在半导体量子点中实现核自旋相干压缩的方案。电子自旋共振的核极化依赖性产生了一个幺正演化，将核自旋驱动到一个集体纠缠态。共振的极化依赖性产生了一个保面积、扭曲的动力学，在不需要核自旋翻转的情况下压缩和拉伸核自旋威格纳分布。我们对压缩时间的估计表明，目前的实验可以达到纠缠的阈值。
