Coupled cantilevers are trapped by laser in a 3-mirror configuration. We studied the signal transduction between the cantilevers by laser control. A force or displacement sensor with such laser trapping technique could achieve much higher sensitivity, as high as 3-4 orders as compared to a single cantilever. We also studied the energy transfer processes by laser trapping and manipulation. Rabi oscillations are observed. Quantum analog Landau-Zener Tunneling and Landau-Zener-Stuckelburg interferometry are realized in the classical regime. We have proved that the energy or signals could be transferred from one cantilever to the other in the real-space by laser manipulation. Laser manipulated coupled cantilvers have great potentials in precision measurements and in quantum information processing.
This chapter discusses some of the guiding principles on systems based optical photons from lasers. Optical photons constitute suitable physical system to represent a qubit. The orthodox view of quantum mechanics is that after the measurement the system collapses to a wave function that gives the result of measurement of the physical property. But according to the realistic view of Einstein, Podolsky and Rosen (EPR), the system has the property even before the measurement since it gives a certain result in the measurement. Hence according to EPR paradox quantum mechanics is an incomplete theory, since there is some external information that is necessary for interpretation of physical reality. In quantum information science the qubit levels are usually denoted as |0> and |1>. An important application of quantum entanglement is quantum teleportation or quantum information transfer. In this process, a quantum state is transferred from one place to another that may be wide apart.