Are vacuum fluctuations real?

A setup for measuring vacuum fluctuations is found here: https://www.nist.gov/video/measuring-zero-point-fluctuations.

An aluminum drum is used to measure vacuum quantum fluctuations ("zero-point fluctuations") that are a result of Heisenberg's uncertainty principle. The measurement system consists of three elements: a superconducting qubit, a mechanical drumhead resonator, and an inductor coil. The oscillating drumhead and the inductor coil form a resonant circuit; when the drumhead is bent, the resonant frequency of this circuit changes. The resonator is electromagnetically coupled to the qubit and can exchange photons. A measurement of the qubit's state determines the number of photons in the resonator.

The system, which is mounted on a microchip, consists of three elements: the drumhead's mechanical resonator; a connected inductor coil. In combination with the drum element, the system acts as a microwave "cavity" – a structure that electrically resonates at around 10 GHz; and an electrically coupled "artificial atom" made of a superconducting Josephson junction (a tiny metal-insulator-metal sandwich).

With the drum in its ground state, the drum must be subject to quantum fluctuations, meaning it is still moving in some way, randomly changing its position and momentum.If you try to "see" this energy directly, you simply won't notice anything. You can never transfer real energy out of the vacuum fluctuations.