Abstract
Large-scale quantum effects have always played an important role in the
foundations of quantum theory. With recent experimental progress and the
aspiration for quantum enhanced applications, the interest in macroscopic
quantum effects has been reinforced. In this review, we critically analyze and
discuss measures aiming to quantify various aspects of macroscopic quantumness.
We survey recent results on the difficulties and prospects to create, maintain
and detect macroscopic quantum states. The role of macroscopic quantum states
in foundational questions as well as practical applications is outlined.
Finally, we present past and on-going experimental advances aiming to generate
and observe macroscopic quantum states.
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