渐近状态向量崩溃与QED非等价表示
Asymptotic State Vector Collapse and QED Nonequivalent Representations
摘要：
本文用非微扰QED方法分析了测量纯态与集体量子系统或光场相互作用中态矢量的演化。作为模型例子，考虑了散射在原子核或中微子上的电子末态的测量。产生的电磁韧致辐射包含了数量不受限制的软光子，导致总辐射通量成为经典可观测量，这意味着态矢坍缩。系统从初始态到最终态的演化是非幺正的，在无限时间的极限下是形式上不可逆的。
英文摘要：
The state vector evolution in the interaction of measured pure state with the collective quantum system or the field is analyzed in a nonperturbative QED formalism. As the model example the measurement of the electron final state scattered on nucleus or neutrino is considered. The produced electromagnetic bremsstrahlung contains the unrestricted number of soft photons resulting in the total radiation flux becoming the classical observable, which means the state vector collapse. The evolution from the initial to the final system state is nonunitary and formally irreversible in the limit of the infinite time.
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