Physics – Quantum Physics
Scientific paper
2011-01-21
Phys.Lett.B698:346-352,2011
Physics
Quantum Physics
14 pages, 5 figures
Scientific paper
10.1016/j.physletb.2011.03.022
Light shining through wall experiments (in the optical as well as in the microwave regime) are a powerful tool to search for light particles coupled very weakly to photons such as axions or extra hidden sector photons. Resonant regeneration, where a resonant cavity is employed to enhance the regeneration rate of photons, is one of the most promising techniques to improve the sensitivity of the next generation of experiments. However, doubts have been voiced if such methods work at very low regeneration rates where on average the cavity contains less than one photon. In this note we report on a demonstration experiment using a microwave cavity driven with extremely low power, to show that resonant amplification works also in this regime. In accordance with standard quantum mechanics this is a demonstration that interference also works at the level of less than one quantum. As an additional benefit this experiment shows that thermal photons inside the cavity cause no adverse effects.
Hartnett John G.
Jaeckel Joerg
Povey Rhys G.
Tobar Michael E.
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