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Quantum Locking

I watched this TED video last week. It’s amazing!

“How can a super-thin 3-inch disk levitate something 70,000 times its own weight? In a riveting demonstration, Boaz Almog shows how a phenomenon known as quantum locking allows a superconductor disk to float over a magnetic rail – completely frictionlessly and with zero energy loss. Experiment: Prof. Guy Deutscher, Mishael Azoulay, Boaz Almog, of the High Tc Superconductivity Group, School of Physics and Astronomy, Tel Aviv University.”

The phenomenon you saw here for a brief moment is called quantum levitation and quantum locking. And the object that was levitating here is called a superconductor. Superconductivity is a quantum state of matter, and it occurs only below a certain critical temperature.

你们在这里看到的这个短暂的现象是 被称为量子悬浮和量子锁定。 这个悬浮在这里的物体 被称为超导体。 超导是物质的一种量子状态, 只在特定的关键温度下发生。

Now, it’s quite an old phenomenon; it was discovered 100 years ago. However, only recently, due to several technological advancements, we are now able to demonstrate to you quantum levitation and quantum locking.

现在,这是一个比较老的现象了; 100年前被发现。 然而,就在最近, 由于若干科技进步, 我们现在能够向你们展示 量子悬浮和量子锁定。

So, a superconductor is defined by two properties. The first is zero electrical resistance, and the second is the expulsion of a magnetic field from the interior of the superconductor. That sounds complicated, right? But what is electrical resistance? So, electricity is the flow of electrons inside a material. And these electrons, while flowing, they collide with the atoms, and in these collisions they lose a certain amount of energy. And they dissipate this energy in the form of heat, and you know that effect. However, inside a superconductor there are no collisions, so there is no energy dissipation.

那么,超导体具备两种特性。 第一种特性是零电阻, 第二种特性是从超导体的内部驱逐磁场。 这听起来有点复杂,是吗? 但什么是电阻呢? 那么,电就是物体内部的电子流。 这些电子,当他们流动时, 它们与原子相撞,在碰撞过程中 它们损失一定的能量。 这种能量以热的形式消耗, 你们知道这种效果的。 然而,在超导体的内部,不存在这种碰撞, 因此也就没有能量消耗。

超导体让电流无阻,却完全隔离磁场,这个挺有意思的。有没有让磁场无阻,电流完全隔离的东西呢?

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