Engineering dual carriageways for signals: Research expands possibilities for more flexible signaling devices

https://phys.org/news/2023-07-dual-carriageways-possibilities-flexible-devices.html

"unidirectional transport signals in pairs of 1-way streets... not lossy, less bulky, and do not require large magnetic fields that break time-reversal symmetry to achieve unidirectional behavior... quadrature nonreciprocity interference between 2 physical processes... unidirectional signal transmission without time-reversal breaking, distinctive dependence on quadrature... dual carriageway... laser signal routing, quantum-limited amplification, quantum information processing and sensing"