Gravity of Quantum System and the Progress of Its Verification

Abstract

What is the gravity of a quantum system and what does it cause? This is a fundamental problem for unifying quantum mechanics and general relativity, which has not been elucidated yet. A key feature for elucidating the problem is the quantum superposition of a gravitational field, which may appear in the superposition of a quantum system with a mass. Interestingly, this quantum phenomenon of gravity generates entanglement in quantum systems. This gravity-induced entanglement can be a main target in the above context. In this article, we share the current studies on the gravity of a quantum system and on gravity-induced entanglement.