Conceptual approach

Vacuum tube and discharge tube technologies can be used for extracting zero-point energy. One type of well known discharge tube is the xenon gas-filled HID (High Intensity Discharge) lamp used as a headlight in cars. It is believed that a discharge tube was chosen by Andrea Rossi when he demonstrated his E-Cat SK in Stockholm 2019 where he showed a tube that radiated visible light.

Another type is the vacuum tube that was common in radio equipment until it was replaced by the transistor.

Approach: from a cathode in the tube, a short burst of electrons are discharged driven by the voltage difference between the cathode and the anode. The short burst of electrons, occuring at a high voltage transient (high dV/dt) makes the electrons form coherent electron clusters, aka pico-clusters or EVO, having low entropy. During the short electron burst at high dV/dt, the cluster will react with the virtual vacuum particles transfrerring energy from the vacuum to the cluster. The energy transfer makes the clusters grow as the volume increases. Finally, the growing cluster becomes unstable and ruptures while releasing the captured energy and thereby increasing entropy so that we now we have less coherent but highly kinetic free electrons. In addition photons are emitted.