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We Are Nowhere Close to Meeting Our Climate Goals

Science Physics.

How entanglement was photographed for the first time

A radio telescope. Sponsored Stories. More at Interesting Engineering.

First Ever Image of Quantum Entanglement - Universe Today

Social Media. The states of quantum systems can be added together and subtracted from each other.

Mathematically, the rules for combining quantum states can be described in the same way as the rules for adding and subtracting vectors. The word for such a combination of quantum states is a superposition. This is really what is behind strange quantum effects that you may have heard about, such as the double-slit experiment, or particle-wave duality.

Then the electron randomly ends up either in the [clockwise spinning] state or in the [anticlockwise spinning] state.

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The odds of one outcome versus the other are easy to calculate with a good physics book at hand. The intrinsic randomness of this process may bother you if your worldview requires the universe to behave in a completely predictable way, but … c'est la experimentally tested vie.

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  6. Quantum entanglement.

Imagine a pair of quantum particles say atoms that start off with a total of units of energy. You and your friend separate the pair, taking one each. You find that yours has 40 units of energy.

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Using the law of conservation of energy, you deduce that the one your friend has must have 60 units of energy. You would know this even if your friend never revealed any information to you. And you would know this even if your friend was off on the other side of the galaxy at the time you measured the energy of your atom.

Nothing spooky about it once you realize this is just correlation, not causation. But the quantum states of a pair of atoms can be more interesting. The energy of the pair can be partitioned in many possible ways consistent with energy conservation, of course. The combined state of the pair of atoms can be in a superposition, for example:.



This is an entangled state of the two atoms. Nevertheless, the properties of the two atoms are correlated because of conservation of energy: their energies always add up to units. And thanks to energy conservation, you would know this even if your friend was off on the other side of the galaxy. Nothing spooky about it.


The two signs are to be placed in two separate rooms, even if they are in different cities. Under each sign there is a normal light switch that turns it on and off. However, the light switches are also linked through two computers connected to the Internet. In this way the neon signs automatically write email to each other so that they are both either ON or OFF and never independent. This means that for example, the neon will turn ON at a strange time, as someone on the other side of the world just switched his or her copy of the entangled pair ON.

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