Summary:
- This article discusses how quantum field theory can explain the behavior of single photons at beam splitters, which are devices that divide a beam of light into two separate beams.
- Quantum field theory suggests that a single photon does not actually split into two parts when it encounters a beam splitter. Instead, the photon's quantum state becomes entangled with the beam splitter, leading to the observed interference patterns.
- Understanding the quantum mechanical behavior of single photons at beam splitters is important for the development of quantum technologies, such as quantum computing and quantum communication.