(In quantum mechanics) the minimum energy possessed by a physical system at a temperature of absolute zero.
1913
Planek's [sic] theory of radiation.., in which the vibrators have a zero-point energy, received firm support from an unexpected source.
Proceedings 3rd International Congr. Refrigerationvol. 2 126 (note)
1935
According to the classical theory, the state of least energy of an oscillator is that of zero energy. According to wave mechanics, however, the ground state has a finite energy E = ½hv0... This zero-point energy can be explained by Heisenberg's uncertainty principle.
J. Dougall, translation of M. Born, Atomic Physics 339
1952
Even in the lowest allowed vibrational state there still remains the zero-point energy of vibration.
C. A. Coulson, Valence i. 11
2007
Quantum mechanics implies that there is a minimum sum of kinetic and potential energies that can be achieved: both cannot simultaneously be zero. This minimum amount is the zero point energy of the atomic assembly.
F. Close, Nothing: Very Short Introd. (2009) vii. 100