**Quantum Mechanics celebrates 100 years**

The development of Quantum Mechanics - Important Contributions

The development of Quantum Mechanics - Important Contributions

- 1900 In order to explain Black Body Radiation, Max Planck introduces the concept of light as quantified objects, photons.
- 1905 Albert Einstein presents an explanation to the Photoelectric Effect by the use of photons.
- 1906 Albert Einstein uses the concept of quantified energy in his theory for specific heat temperature dependence of solids.
- 1910 In a famous experiment, Ernest Rutherford discovers that atoms consists of a heavy nucleus and a cloud of electrons.
- 1913 Niels Bohr contradicts classical Newtonian physics when he describes atomic spectra with quantum theory energy levels.
- 1924 Louis De Broglie presents his wave hypothesis, which suggests that electrons - and all matter - have wave characteristics, as well as particle characteristics.
- 1924 Werner Heisenberg makes a first draft of the new quantum mechanics theory.
- 1925 Erwin Schrödinger presents the wave mechanics with its wave function.
- 1926 Max Born interprets the wave function as a "probability wave" and not a "physical wave" that Schrödinger suggested.
- 1926 Graduate student Paul Dirac presents a quantum mechanics theory that includes Schrödinger's and Heisenberg's theories.
- 1927 Werner Heisenberg present the uncertainty principle.
- 1927 Niels Bohr introduces the principle of complementarity as a philosophical approach to quantum mechanics.
- 1928 Paul Dirac presents a wave function for the electron, combining special relativity and quantum mechanics. This theory predicted several phenomena that later was confirmed; antiparticles and electron spin.
- 1948 Richard P Feymnan, Julian Schwinger et al, develops methods within Quantum Electrodynamics which allow spectacular agreement between theoretical computations and experimental measurements.

What the next 100 years of quantum mechanics will bring us ? Well...

- Quantum computers
- Quantum cryptograhy
- Unified theory for quantum mechanics and theory of realtivity

Finally, a quote from the physics teacher of Max Planck, the man who started it all, in 1876:

Don't spend your time on physics; there's hardly anything left to discover