arXiv:1705.09548physics.class-ph
Breaking Lorentz reciprocity with frequency conversion and delay
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Abstract
We introduce a method for breaking Lorentz reciprocity based upon the non-commutation of frequency conversion and delay. The method requires no magnetic materials or resonant physics, allowing for the design of scalable and broadband non-reciprocal circuits. With this approach, two types of gyrators --- universal building blocks for linear, non-reciprocal circuits --- are constructed. Using one of these gyrators, we create a circulator with > 15 dB of isolation across the 5 -- 9 GHz band. Our designs may be readily extended to any platform with suitable frequency conversion elements, including semiconducting devices for telecommunication or an on-chip superconducting implementation for quantum information processing.
There are lots of systems that break the reciprocity: https://arxiv.org/pdf/1705.09548.pdf from a few months ago has some descriptions. I think (not having read the Science paper) the issue would be that the underlying fundamental physics has reciprocity as a basic feature by…
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