Preparing a harmonic oscillator in a state with a well-defined energy is a tricky business. With the new tools provided by cavity and circuit quantum electrodynamics it is now possible to make these pure quantum states and watch how they evolve in time.
Physics1, 20 (2008) – Published September 15, 2008
Thick layers of disordered materials, such as milk or snow, scatter light so that very little of it gets through. Theorists say that a properly designed combination of incident light waves would be almost completely transmitted and we now have experimental proof of this remarkable result.
Squeezed states can enhance the sensitivity of a detector and the storage capability of quantum memory devices. Because these features improve with an increase in system size, researchers are exploring ways to produce squeezed states in large ensembles of atoms.
The response of nanostructured metal strips to an electromagnetic field may turn out to be similar to that of atomic gases. Periodic arrays of these artificial metal “molecules” could in principle form a metamaterial that slows light pulses and is easily integrated into optical circuits.
Single photon emission is normally only observed in systems, such as atoms, that are quantum confined in all directions. Now, scientists have shown that carbon nanotubes, which are quasi-one-dimensional materials, can also act as single photon emitters.
Phys. Rev. Focus21, 14 (2008) – Published April 23, 2008
Ghost imaging, in which images are made using light that never came near the object, has now been demonstrated with reflected light, but the debate continues over whether the effect can be explained with classical physics.
Phys. Rev. Focus21, 5 (2008) – Published February 6, 2008
New calculations show that a material with the right electrical properties could dramatically improve the efficiency of light-like waves that travel on metal surfaces. Devices based on these waves might someday process light signals on a chip.