# Help with intuition concering braket sandwich

Hymne
Hi there!
I have a hard time getting any sense out of what the sandwich:

<q'', t'' | Q(t1) | q', t'>
where t' < t1 < t'', actually means..

If we skip Q(t1) we get the usual transition amplitude. But how should i interpret this when we use an operator that is timedependet but act on a statevector in the "wrong time"?

Thanks!