The time–bandwidth limit inherently relates the lifetime of a resonance and its spectral bandwidth, with direct implications for the maximum storage time of a pulse versus its frequency content. Recently, it has been argued that nonreciprocal cavities may overcome this constraint by breaking the strict equality of their incoupling and outcoupling coefficients. Here, we study the implications of nonreciprocity on resonant linear, time-invariant cavities and derive general relations, stemming from microscopic reversibility, that govern their dynamics. We show that nonreciprocal cavities do not provide specific advantages in terms of the time–bandwidth limit, but enable other attractive properties for nanophotonic systems.

中文翻译：

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不可逆腔和时间带宽限制

时间带宽限制与谐振的寿命及其频谱带宽有着内在的联系，直接关系到脉冲的最大存储时间与其频率含量之间的关系。最近，已经有人提出，不可逆的空腔可以通过打破它们的耦合系数和耦合系数的严格相等性来克服这一限制。在这里，我们研究了不可逆性对共振线性，时不变腔的影响，并从微观可逆性推导了控制其动力学的一般关系。我们表明，不可逆的腔体在时间带宽限制方面没有提供特定的优势，但可以为纳米光子系统提供其他吸引人的特性。