论文标题
生物量子量：磷酸钙二聚体，而不是三聚体
The Biological Qubit: Calcium Phosphate Dimers, not Trimers
论文作者
论文摘要
Posner分子（磷酸钙三聚体）由于据称长寿的$^{31} $ p核自旋状态而被认为是生物量子信息处理器的作用。我们最近发现该分子缺乏对称性的旋转轴的挑战，这是对Posner介导的神经加工的提案的重要假设的挑战，并且是一种不对称的动力学集合。在此之后，我们在这里调查了分子纠缠的$^{31} $ p核自旋的自旋动力学。我们的模拟表明，在单独的Posner分子下在钟形分子下衰减的两个核自旋之间的纠缠速度比以前假设的速度快得多，并且不足以进行超细胞神经元处理。然而，发现磷酸钙二聚体令人惊讶地弹性，能够将纠缠的核自旋保存数百秒，这表明可能通过它们进行神经加工。
The Posner molecule (calcium phosphate trimer), has been hypothesized to function as a biological quantum information processor due to its supposedly long-lived entangled $^{31}$P nuclear spin states. This hypothesis was challenged by our recent finding that the molecule lacks a well-defined rotational axis of symmetry -- an essential assumption in the proposal for Posner-mediated neural processing -- and exists as an asymmetric dynamical ensemble. Following up, we investigate here the spin dynamics of the molecule's entangled $^{31}$P nuclear spins within the asymmetric ensemble. Our simulations show that entanglement between two nuclear spins prepared in a Bell state in separate Posner molecules decays on a sub-second timescale -- much faster than previously hypothesized, and not long enough for super-cellular neuronal processing. Calcium phosphate dimers however, are found to be surprisingly resilient to decoherence and are able to preserve entangled nuclear spins for hundreds of seconds, suggesting that neural processing might occur through them instead.
