The quantum vacuum state or simply quantum vacuum refers to the quantum state with the lowest possible energy.
Quantum vacuum may also refer to:
- Quantum chromodynamic vacuum (QCD vacuum), a non-perturbative vacuum
- Quantum electrodynamic vacuum (QED vacuum), a field-theoretic vacuum
- Quantum vacuum (ground state), the state of lowest energy of a quantum system
- Quantum vacuum collapse, a hypothetical vacuum metastability event
- Quantum vacuum expectation value, an operator's average, expected value in a quantum vacuum
- Quantum vacuum energy, an underlying background energy that exists in space throughout the entire Universe
- The Quantum Vacuum, a physics textbook by Peter W. Milonni