# What is Cavity quantum Mechanics?

## What is Cavity quantum Mechanics?

Cavity quantum electrodynamics (cavity QED) is the study of the interaction between light confined in a reflective cavity and atoms or other particles, under conditions where the quantum nature of light photons is significant. It could in principle be used to construct a quantum computer.

### How accurate is quantum electrodynamics?

High-energy QED processes These experiments typically achieve only percent-level accuracy, but their results are consistent with the precise measurements available at lower energies. α−1 = 139.9 (1.2).

#### What is quantum electrodynamics used for?

quantum electrodynamics (QED) Use of quantum mechanics to study the properties of electromagnetic radiation and how it interacts with charged elementary particles.

**How many photons are trapped in the cavity?**

Soon the cavity contains two photons, modifying the odds for subsequent emission even further, then three and so on at a rate that depends at each step on the number of previously deposited photons. In fact, of course, the photon number does not increase without limit as atoms keep crossing the resonator.

**What is Rabi splitting?**

Compared with normal mode couplings, Rabi splitting refers in particular to strong coupling in which the coupling strength exceeds the dissipation rates of the system and the energy is therefore coherently exchanged between atom and cavity photon.

## Is QED false?

Quantum electrodynamics is a false theory because it was based on Einstein’s false hypothesis of massless quanta of fields, which led to the contradicting relativity theories.

### Is quantum electrodynamics complete?

QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electromagnetism giving a complete account of matter and light interaction.

#### Who invented quantum electrodynamics?

The QED theory was refined and fully developed in the late 1940s by Richard P. Feynman, Julian S. Schwinger, and Tomonaga Shin’ichirō, independently of one another.

**Is it possible to trap a photon?**

The photon doesn’t interact with electromagnetic fields that are used to trap matter, so it can’t be trapped in that way. In general relativity, gravitational fields can deflect light, but not trap it. According to special relativity, a photon can never be at rest.

**How is Rabi frequency calculated?**

For a given rotational quantum number J and for Q type transitions ( J = 0), the AT splitting of each individual pair of components is equal to the corresponding coupling laser Rabi frequency which is linearly proportional to the value; i.e., Ω = | M J | J ( J + 1 ) E 〈 v | μ e | v ′ 〉 / ℏ .