It is true that Einstein recognized and accepted the wave-particle duality of particles, as described by Louis de Broglie's work on the wave nature of matter. However, Einstein did have reservations and skepticism regarding the interpretation and implications of the uncertainty principle, which is a fundamental principle of quantum mechanics.
The uncertainty principle, formulated by Werner Heisenberg, states that there are inherent limits to the precision with which certain pairs of physical properties, such as position and momentum, or energy and time, can be simultaneously known. It implies that at the quantum level, there is a fundamental uncertainty or fuzziness in the behavior of particles.
Einstein's resistance to the uncertainty principle stemmed from his deep-rooted philosophical views and his desire for a more deterministic and complete description of physical reality. He was famously quoted as saying, "God does not play dice with the universe," expressing his belief that there must be underlying deterministic laws governing the behavior of particles, rather than inherent uncertainty.
Einstein's skepticism and debates with other physicists, such as Niels Bohr, were focused on the philosophical and interpretational aspects of quantum mechanics, rather than its mathematical formalism or experimental predictions. He sought a more complete theory that could explain the phenomena of quantum mechanics in terms of hidden variables or deterministic processes.
It's worth noting that while Einstein's reservations regarding the uncertainty principle were influential in philosophical and interpretational debates, subsequent experimental evidence and developments in quantum mechanics have strongly supported the validity and importance of the uncertainty principle as a fundamental aspect of the quantum world.