保序量子态的衰变
Decay of symmetry-protected quantum states
摘要：
研究了三势阱玻色-哈伯德链中玻色多体态的衰变，其中中心势阱中的玻色可以逃逸到一个库中。对于消失的粒子间的相互作用，该系统支持一个非衰减的多体状态，这是反对称的玻色-爱因斯坦凝聚体，粒子只占据边缘阱。在经典方法中，该量子态对应于对称性保护的非衰减态，其即使在低于一定强度阈值的有限相互作用下也是稳定的。在这里，我们证明，尽管经典对应是稳定的反对称玻色-爱因斯坦凝聚体总是亚稳态在有限的原子间相互作用，由于量子涨落。
英文摘要：
We study the decay of bosonic many-body states in the three well Bose-Hubbard chain where bosons in the central well can escape into a reservoir. For vanishing inter-particle interaction this system supports a non-decaying many-body state which is the antisymmetric Bose-Einstein condensate with particles occupying only the edge wells. In the classical approach this quantum state corresponds to a symmetry protected non-decaying state which is stable even at finite interaction below a certain intensity threshold. Here we demonstrate that despite the classical counterpart is stable the antisymmetric Bose-Einstein condensate is always metastable at finite interatomic interactions due to quantum fluctuations.
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