Read more at: http://phys.org/news/2014-06-viewing-deeper-quantum-world.html#jCp
One of the important tasks for quantum physics researchers and engineers is designing more sensitive instruments to study the tiny fields and forces that govern the world we live in. The most precise measuring instruments devised to date, such as atomic clocks or gravitational wave detectors, are interferometric in nature and operate according to the laws of quantum mechanics.
As with all quantum objects, photons – the basic building blocks of light - display a "wave-particle" duality. Interferometers exploit the wave-like behaviour of photons to measure a signal, known as a phase shift, affected by tiny forces acting on the interferometer. However, the particle-like behaviour of the same photons introduces noise into the measurement, reducing the quality of the results and limiting the sensitivity of these instruments.