Quantum field theory unifies quantum mechanics with special relativity from "summary" of The Principles of Quantum Mechanics by P. A. M. Dirac
Quantum field theory provides a framework for combining the principles of quantum mechanics with those of special relativity. Quantum mechanics deals with the behavior of particles on a small scale, while special relativity governs the behavior of objects moving at high speeds. By unifying these two theories, quantum field theory allows us to describe the interactions between particles in a way that is consistent with both quantum mechanics and special relativity. In quantum field theory, particles are not treated as separate entities but as excitations of underlying fields that permeate all of space. These fields interact with each other by exchanging virtual particles, which mediate the forces between particles. This approach allows us to describe the behavior of particles in a way that is consistent with the principles of quantum mechanics, where particles can exist in superposition states and be in multiple places at once. Special relativity introduces the concept of sp...
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