Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA and Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
Phys Rev Lett. 2013 Nov 1;111(18):180401. doi: 10.1103/PhysRevLett.111.180401. Epub 2013 Oct 29.
We propose a method to generate massive entanglement in a spinor Bose-Einstein condensate from an initial product state through an adiabatic sweep of the magnetic field across a quantum phase transition induced by competition between the spin-dependent collision interaction and the quadratic Zeeman effect. The generated many-body entanglement is characterized by the experimentally measurable entanglement depth in the proximity of the Dicke state. We show that the scheme is robust to practical noise and experimental imperfection and under realistic conditions it is possible to generate genuine entanglement for hundreds of atoms.
我们提出了一种方法，通过在自旋依赖碰撞相互作用和二次塞曼效应竞争引起的量子相变中，对磁场进行绝热扫过，从初始乘积态产生自旋玻色-爱因斯坦凝聚体中的大量纠缠。所产生的多体纠缠特性由狄克态附近可实验测量的纠缠深度来表征。我们表明该方案对实际噪声和实验不完美具有鲁棒性，并且在现实条件下，有可能为数百个原子产生真正的纠缠。
