The beat time Ï„ fpt associated with the energy transfer between two coupled oscillators is dictated by the bandwidth theorem which sets a lower bound Ï„ fptâˆ¼1/Î´Ï‰. We show, both experimentally and theoretically, that two coupled active LRC electrical oscillators with parity-time (PT) symmetry bypass the lower bound imposed by the bandwidth theorem, reducing the beat time to zero while retaining a real valued spectrum and fixed eigenfrequency difference Î´Ï‰. Our results foster design strategies which lead to (stable) pseudounitary wave evolution, and may allow for ultrafast computation, telecommunication, and signal processing. Â© 2012 American Physical Society.
Hamidreza Ramezani, et. al., (2012) Bypassing the bandwidth theorem with PT symmetry.Physical Review A - Atomic, Molecular, and Optical Physics85:6. DOI: http://doi.org/10.1103/PhysRevA.85.062122
Physical Review A - Atomic, Molecular, and Optical Physics