Measurements of two important quantum phenomena—the quantum Hall effect and the Josephson effect—provide high precision for tests of the laws of electricity and magnetism and for determinations of Planck’s constant h and the electron charge e. Now researchers propose an approach to achieve similar benefits for gravitational physics by exploiting analogous experiments involving gravitational forces [1]. They hope such experiments can be realized in the next few years, allowing more stringent tests of both gravitation and quantum theory.
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