In quantum mechanics there are several effects which are spooky and yet the theory relates very well with observations.
1. Schrodinger’s cat: Alive and dead at the same time (ok a bit of (or quite a lot of) a stretch as this is seen only at atomic scales).
2. Being present at two places at once: An atom can be present at two places at the same time. This was shown in an elliptical arrangement of Cadmium atoms. An atom inside could be sensed at both the foci.
3. Same as above, a particle seems to go through both the slits at the same time in the double slit experiment.
4. Ghost orbits: classical orbits which don’t exist at a given parameter appear to change probability distribution in a quantum state.
All these effect are real, Have theories which help make predictions in various scenarios. However the interpretation of the quantum theory, known as the Copenhagen interpretation can not be intuitively understood, the major argument in favor of the theory being that it works.
“Quantum supremacy, the first 200 seconds for Google, a giant leap for mankind?”