Quantum Entanglement: A New Way to Be Married

In other words, when two or more particles are entangled, they behave as if they were one and the same, and any change to one instantaneously and identically changes those entangled with it even if they’re a universe apart. “Just try doing that in a marriage contract,” Mr. Keats says.

That’s quoted text but there’s no link to the source, which led me to Google and find a press release which says something similar

According to quantum mechanics, when two or more particles are entangled, they behave as if they were one and the same. Any change to one instantaneously and identically changes those entangled with it even if they’re a universe apart.

Unfortunately, Mr. Keats is wrong. This is the oft-reperated canard of the pop-sci version of quantum entanglement. Any measurement of one will tell you the state of the other, but that breaks the entanglement, and it means you cannot know the state of the particle beforehand. So this gesture means having to forget who you are. As soon as you remember, or someone recognizes you, that’s gone.

What the quote should really say is

According to people who don’t understand quantum mechanics, when two or more particles are entangled, they behave as if they were one and the same. Any change to one instantaneously and identically changes those entangled with it even if they’re a universe apart. In real quantum physics, this isn’t the case.

You can still turn this into a romantic gesture, but please, don’t mangle the science to do so.