Most quantum computing technologies depend on proficiency in producing, manipulating, and observing non-classical states of light. Non-classical states are quantum states that cannot directly be generated through traditional sources of light, such as lamps and lasers. They can, therefore, not be described by the theory of classical electromagnetism.
These individual states include squeezed states, entangled states, and states with a negative Wigner function. The potential to similarly control the conditions of phononic systems, those referring to acoustics and vibration, could open fascinating possibilities for improving new quantum technologies involving devices for quantum sensing and quantum information processing.
Researchers at Delft University of Technology (TU Delft)’s Kavli Institute of Nanoscience have lately introduced a method that could be used to attain a high level of control over phononic waveguides. This method, outlined in a paper published in Nature Physics, could facilitate phononic waveguides in quantum technology, similar to how optical fibers and waveguides are utilized today.
Optical fibers and waveguides can transmit quantum information encoded in optical photons. Across the past decades, they have been essential components for quantum and refined communication technology.
The main objective of the recent work by Gröblacher and his collaborators was to formulate a method to regulate non-classical mechanical states in a phononic waveguide with individual phonons in a suspended silicon microstructure. They eventually aim to introduce a new toolbox to conduct investigations in the field of quantum acoustics, which would ultimately allow physicists and engineers to interact with quantum systems in different ways.