在一个腔中N个原子纠缠态的有效制备方案

本文提出一个方案以通过探测光子的衰减来制备囚禁在一个腔中的若干个原子的W态。在我们的方案中，腔的衰减率远大于原子与腔的耦合强度。这样,对腔品质因子的要求被大大降低。这在实验上是很重要的。本方案的另一个优点是通过拉曼跃迁原子总是处于两个基态，因而原子的自发辐射也被抑制。

Robust scheme for the generation of entangled states for N atoms in a cavity

A scheme is proposed for the generation of W entangled states for several atoms trapped in a cavity by detecting photon decay. The scheme works in the regime, where the cavity decay rate is larger than the atom-cavity coupling strength. Thus, the requirement for the quality factor of the cavity is greatly loosened, which is of importance in view of experiment. Another advantage of this scheme is that the atoms are always populated in two ground states coupled by Raman transitions, thus the spontaneous emission can also be suppressed.