Abstract Shock wave gives back reaction to spacetime and the information is stored in the memory of background. Quantum memory effect of localised shock wave on Minkowski metric is investigated here. We find that the Wightman function for massless scalar field, on both sides of the wave location, turns out to be the same for usual Minkowski spacetime. Therefore the observables obtained from this, for any kind of observer, do not show the signature of the shock. Moreover, the vacuum states of field on both sides are equivalent. On the contrary, the correlator for the non-vacuum state does memorise the classical shock wave and hence the effect of it is visible in the observables, even for any frame. We argue that rather than vacuum state, the non-vacuum ones are relevant to retrieve the quantum information of classical memory.

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非真空状态与检索时空的冲击波记忆有很大关系吗？

摘要 冲击波对时空进行反馈反应，并将信息存储在背景存储器中。这里研究了局部冲击波对 Minkowski 度量的量子记忆效应。我们发现，波位置两侧的无质量标量场的 Wightman 函数对于通常的 Minkowski 时空是相同的。因此，由此获得的观测值，对于任何类型的观察者来说，都不会显示出冲击的特征。而且，两侧场的真空状态是等效的。相反，非真空状态的相关器确实记住了经典冲击波，因此它的影响在可观察量中是可见的，即使对于任何帧也是如此。我们认为，非真空状态与检索经典记忆的量子信息有关，而不是真空状态。