A group of scientists from the University of Edinburgh's School of Physics and Astronomy used mathematical calculations to prove that quantum communication across interstellar spaces should be possible. The group published their calculations in Physical Review D. They also discuss the possibility that extraterrestrial beings might attempt to communicate with us via such signaling.
Scientists have been studying quantum communications over the last several years as a secure method of transmitting messages. Previous research has demonstrated that it is nearly impossible to intercept these messages without being detected. Researchers looked into whether similar communications could be made across interstellar space. They used math to calculate the movement of Xrays across a medium such as between stars. They also wanted to determine if their calculations could indicate the amount of decoherence possible during such a journey.
Engineers are confronted with quantum particles, which lose some or all their unique characteristics when they interact with obstacles in their path. They have been shown to be delicate in quantum communications. These events are called decoherence and engineers who work to create quantum networks are trying to find solutions. Research has already shown that the space between stars is quite clean. But is this enough to allow quantum communication? It is, according to math. It is so pure that Xray photons can travel hundreds of thousands of light-years without decoherence. This includes gravitational interference from other astrophysical bodies. In their research, they found that both microwave and optical bands work equally well.
Researchers noted that quantum communication across the galaxy is possible, so if there are intelligent beings in the Milky Way, then they could be already trying to communicate with us via such technology. We could even start looking for them. They suggest that quantum teleportation over interstellar space is possible.