Putting a living organism into superposition state

Schrödinger's cat: a cat, a flask of poison, and a radioactive source are placed in a sealed box. If an internal monitor detects rad...

Schrödinger's cat: a cat, a flask of poison, and a radioactive source are placed in a sealed box. If an internal monitor detects radioactivity (i.e. a single atom decaying), the flask is shattered, releasing the poison that kills the cat. The Copenhagen interpretation of quantum mechanics implies that after a while, the cat is simultaneously alive and dead. Yet, when one looks in the box, one sees the cat either alive or dead, not both alive and dead. This poses the question of when exactly quantum superposition ends and reality collapses into one possibility or the other. Credit: Wikipedia / CC BY-SA 3.0

A pair of physicists, one with Tsinghua University in China, the other with Perdue University in the U.S. has come up with what they believe is a viable way to cause a living organism to be in two places at the same time. In the paper they have posted to the arXiv server, Zhang-Qi Yin and Tongcang Li suggest that an experiment conducted at the University of Colorado recently, could be modified by placing a living organism into a superposition state, rather than using just a piece of metal.

The research pair liken their experimental idea to bringing to life to the famous Schrödinger thought experiment that involved a cat and other items placed in a closed box—or perhaps more poetically, comparing it to fairy tales where a fairy can exist in more than one place at the same time. Superposition, is of course, a principle of quantum theory that describes a concept where two objects can exist in more than one physical location at the same exact moment.

Two years ago, researchers at the University of Colorado put a very small vibrating aluminum membrane into a superposition state—Li and Yin believe that if a microbe were put on the same type of membrane it could be put into a superposition state along with the membrane. They note that to date, no one has put any sort of living organism into a superposition state, despite a lot of interest in doing so by both academics and the public at large.

More specifically, the team suggests the way to make it work would involve cooling a common bacterium down to approximately 10mK to prevent chemical activity from taking place and energy from being exchanged with the environment, then causing the microbe to adhere to the membrane using natural forces. That should be enough, they theorize, to allow for the bacterium to be put into a superposition state along with the oscillating membrane.

The scheme does raise the question of whether the organism is in fact living (but then so does Schrödinger's cat) because the microbe would be frozen solid—not dead, necessarily, because once warmed, it would wake and once again act like a living organism. The research pair note that they have no idea at this point how superposition might work with an active organism.

They also suggest that if anyone were to actually carry out their ideas via experiment, they might also consider doing another experiment, one that would use the same equipment and microbe, where the position of a microbe would be entangled with the spin of an atom residing inside of it—a way of testing for defective protein DNA inside of a living organism.

Source:Physics.org:Read More>>