互联网上的一些视频显示出一种叫做“量子悬浮”的东西。这是什么?它是如何工作的?我们能驾驶飞车吗?量子悬浮被称为一个过程,科学家利用量子物理学的特性将物体(特别是超导体)悬浮在磁源上(特别是为此目的设计的量子悬浮轨道)。这种作用的原因是称为迈斯纳效应和磁通钉扎。迈斯纳效应决定磁场中的超导体将总是排出其内部的磁场,从而弯曲其周围的磁场。问题是平衡问题。如果你只是在磁铁上放置一个超导体,那么超导体就会漂浮在磁铁上,有点像试图平衡两个磁棒的南磁极彼此。量子悬浮过程变得更加有趣,通过磁通钉扎或量子锁定的过程,如特拉维夫大学超导体组以这种方式所描述的:超导性和磁场[原文如此]彼此不相似。如果可能,超导体将从内部排出所有磁场。这是迈斯纳效应。在我们的例子中,由于超导体非常薄,磁场DOES会穿透。然而,它是以离散量(这毕竟是量子物理学!)来做到的,称为磁通管。在每个磁通管内部,超导性被局部破坏。超导体将试图将磁管固定在薄弱区域(例如晶界)。超导体的任何空间运动都会使磁通管移动。为了防止超导体在半空中“被困”。 “量子悬浮”和“量子锁定”这一术语是由特拉维夫大学物理学家Guy Deutscher(该领域的主要研究人员之一)为此过程创造的。让我们来看看超导体究竟是什么:它是一种电子能够非常容易地流动的材料。电子在没有电阻的情况下流过超导体,因此当磁场接近超导材料时,超导体在其表面上形成小电流,抵消进入的磁场。结果是超导体表面内的磁场强度精确为零。如果您映射了净磁场线,则表明它们在物体周围弯曲。

澳大利亚国立大学物理Essay代写: 量子悬浮

Some videos on the internet show something called “quantum levitation.” What is this? How does it work? Will we be able to have flying cars? Quantum levitation as it is called is a process where scientists use the properties of quantum physics to levitate an object (specifically, a superconductor) over a magnetic source (specifically a quantum levitation track designed for this purpose). The reason this works is something called the Meissner effect and magnetic flux pinning. The Meissner effect dictates that a superconductor in a magnetic field will always expel the magnetic field inside of it, and thus bend the magnetic field around it. The problem is a matter of equilibrium. If you just placed a superconductor on top of a magnet, then the superconductor would just float off the magnet, sort of like trying to balance two south magnetic poles of bar magnets against each other. The quantum levitation process becomes far more intriguing through the process of flux pinning, or quantum locking, as described by Tel Aviv University superconductor group in this way: Superconductivity and magnetic field [sic] do not like each other. When possible, the superconductor will expel all the magnetic field from inside. This is the Meissner effect. In our case, since the superconductor is extremely thin, the magnetic field DOES penetrates. However, it does that in discrete quantities (this is quantum physics after all! ) called flux tubes. Inside each magnetic flux tube superconductivity is locally destroyed. The superconductor will try to keep the magnetic tubes pinned in weak areas (e.g. grain boundaries). Any spatial movement of the superconductor will cause the flux tubes to move. In order to prevent that the superconductor remains “trapped” in midair. The terms “quantum levitation” and “quantum locking” were coined for this process by Tel Aviv University physicist Guy Deutscher, one of the lead researchers in this field. Let’s think about what a superconductor really is: it’s a material in which electrons are able to flow very easily. Electrons flow through superconductors with no resistance, so that when magnetic fields get close to a superconducting material, the superconductor forms small currents on its surface, canceling out the incoming magnetic field. The result is that the magnetic field intensity inside of the surface of the superconductor is precisely zero. If you mapped the net magnetic field lines it would show that they’re bending around the object.

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