论文标题
在量子计量学中使用适应性和因果叠加
Using adaptiveness and causal superpositions against noise in quantum metrology
论文作者
论文摘要
在最一般的自适应量子计量方案中，我们在可实现的精度方面得出了新的界限。事实证明，边界在大量通道用途的极限下渐近饱和，并且等效于已知的并行方案边界。这完全解决了量子计量学领域的长期猜想，这些猜想在平行策略和适应性策略之间的渐近等效性方面。新的界限还可以轻松评估引用非标准因果叠加策略的潜在益处，我们证明，与适应性情况相似，与平行相似。
We derive new bounds on achievable precision in the most general adaptive quantum metrological scenarios. The bounds are proven to be asymptotically saturable and equivalent to the known parallel scheme bounds in the limit of large number of channel uses. This completely solves a long standing conjecture in the field of quantum metrology on asymptotic equivalence between parallel and adaptive strategies. The new bounds also allow to easily assess the potential benefits of invoking the non-standard causal superposition strategies, for which we prove, similarly to the adaptive case, the lack of asymptotic advantage over the parallel ones.
