Zero-point energy In physics, the zero point energy is the lowest energy that a quantum mechanical physical system may possess and is the ground state energy of the system. The concept of zero point energy was proposed by Albert Einstein and Otto Stern in 1913 and was originally called “residual energy”. The zero point energy term is a translation of Nullpunktsenergie Germany. All quantum mechanical systems have zero-point energy. The term arises commonly in reference to the ground state of quantum harmonic oscillator and its null oscillations. In quantum field theory, is a synonym for the vacuum energy or dark energy, an amount of energy associated with the emptiness of empty space. In cosmology, the vacuum energy is taken as the basis for the cosmological constant. For the experiment, the zero point energy generated by the Casimir effect and is directly observable in nanoscale devices.Because the zero point energy is the lowest energy a system can be, can not be removed from the system. A related term is the zero point field is the lowest energy state for a field, its ground state, which is not zero. Despite the definition, the concept of zero point energy and the possibility of extracting “free energy” vacuum have attracted the attention of novice inventors. Numerous perpetual motion machines and other equipment pseudoscientific, are often called free energy devices, in order to exploit the idea. As a result of this activity and its intriguing theoretical explanation, the concept has taken on a life of its own in popular culture, appearing in science fiction books, games and movies.