Illustration of Chinese quantum teleportation
With the help of quantum teleportation, researchers want to build a new, secure internet that allows anyone to access powerful quantum computers
Cloud computing has become a reality from business hype, which most users do not consciously perceive. Whether photos, music or eBooks lie in the memory of the smartphone or in the network – as long as the immediate access is guaranteed, the user does not interest the details. But the technique has a rough disadvantage, which becomes aware of us all altogether: We give mountains of personal data into the hands of gross companies, where they are more or less secure (both in terms of their theft as well as their commercial use).
A way out could offer a quantum infrastructure, not just because quantum computers are extremely powerful. The phanomena of the quantum world also allow absolutely secure transmission of information as well as their machining in a way that does not even get the computer itself, with which data he is currently expecting (blind quantum computing).
This means not promises of the IT experts, but basic laws of physics to which the smartest hackers have to be kept (which are still looking for weakness of concrete implementation). For this purpose, however, the complete process must be hedged accordingly – a single step traditionally electronic information transfer infects the complete system with its security risks.
The problem of the shift
In two recent publications in Nature Photonics, researchers from China and from Canada now present their technique how they want to implement the first step: the transmission of information about the user to the manufacturing computer, a quantum computer, with the help of quantum teleportation.
With the "Star Trek" known beamed has nothing to do. In the quantum teleportation, the quantum state of a particle (ie the information) is transferred to another, which can be elsewhere. In this way, the information could safely hike from the user’s computer to a central quantum server.
Prerequisite for this are (at least) two interconnected particles – in practice usually light particles (photons), because they can be transmitted primarily via glass fiber cables. The difficulty here is to establish the shift, although the light sources are far apart from each other. This problem has solved the researchers in Hefei and Calgary – in different ways.
They are attracted to very different boundaries, which scientists are always fascinating: this usually measures relatively quickly real progress by combining techniques. The Chinese researchers have transmitted information on individual photons, but only reach "Data rates" of two photons per hour.
The Canadian team, on the other hand, comes to 17 photons per minute, but encodes information in a surpose of circumstances. The little disadvantage: one wife only afterwards, what you have actually transferred.
When you can book your quantum computer access? Not so soon. Maybe the complete concept of the distributed quantum calculation is nonsensical. Had someone in 1950 "Internet" Designed, he probably also amed that the coarse part of the compensation capacity is provided by huge electron tubes or relays.
A mini-computer in every reasonably intelligent cake machine sounded so utopian as today the idea of having a quantum computer under the desk.
The ebook "The fascinating world of quantas" The author is available at Beam-eBooks, Amazon and Apple.