In modern physics, space-time is described by the theory of general relativity, which treats it as a dynamic, four-dimensional fabric that can be curved by the presence of mass and energy. The concept of quantum fields, on the other hand, arises from quantum field theory, which is a framework that combines quantum mechanics with special relativity to describe the behavior of elementary particles and their interactions.
According to our current understanding, quantum fields permeate all of space-time. These fields are associated with different types of particles, such as electrons, photons, and quarks. They exist in a state of quantum superposition, meaning they can fluctuate and interact with one another. The interactions of these quantum fields give rise to the fundamental forces and particles that we observe in the universe.
So, while the fabric of space-time and quantum fields are related concepts, it would be more accurate to say that quantum fields exist within the fabric of space-time rather than the fabric of space-time being made up of all the quantum fields combined. The fabric of space-time provides the stage upon which quantum fields and their interactions occur.