Seminars

Quantum physics will revolutionize blockchain technology

Quantum entanglement can give blockchain technology a security equivalent to that of quantum cryptography, according to research. It will allow to store the information of the network in the past, by means of photons that do not exist in the present, reason why it would work like a machine of the time.

The blockchain or blockchain is a relatively recent technology that allows grouping information into an articulated data structure, through which information is grouped into different blocks to be jointly managed in a secure manner.

This technology allows to build a large distributed and secure database due to encryption. It has multiple applications, especially in transactions, whether economic or otherwise. It is estimated that 10 percent of world GDP will be stored by blockchain in 2027. There is even a project to apply blockchain to electronic government, which emerged in Spain within the New World Club.

The security of this technology is provided by the group of members, since, in order to compromise the data included in this database, a computing power and presence in the network would be higher than that of the set of combined For this reason it is especially indicated in activities that require storage of data ordered in time, without the possibility of being modified or revised. The only potential threat that lurks the blockchain, as the IEEE Spectrum magazine explains, is quantum computing.

But, according to researchers from the University of Wellington, in New Zealand, it is theoretically possible to incorporate the property of quantum entanglement into the blockchain, which would allow this technology to go back in time and offer a security equivalent to that of quantum. Quantum entanglement is a property of elementary particles. It occurs when particles such as photons or electrons interact physically and then separate. Despite the separation, they remain intimately connected, even if they are thousands of miles away, so that any deliberate modification in one particle is instantly reflected in the other.

This property not only takes place in space (it has been proven that it works underwater and even between a satellite and the earth’s surface), but also operates over time, as Aeon magazine explains in this regard. This allows interlocking particles that have never been found (and that according to ordinary physics could never have been intertwined) and that do not exist simultaneously, according to add the authors of this research in an article published in ArXiv.

Researchers in New Zealand suggest that a chain of quantum blocks could withstand attempts at piracy by quantum computers. All the components of this quantum system have already been experimentally verified, they say.

The method proposed by these scientists consists of coding the chain of blocks in a temporary state in which the entangled photons that make up these blocks do not coexist simultaneously. This quantum entanglement in time, as opposed to an entanglement in space, provides a crucial quantum advantage, these researchers point out.

With this technology, the records of a chain of blocks are not simply linked to a record of the past, but rather to a record that is in the past, one that no longer exists in the present, so the technology they have developed It can be considered as a machine that travels through time.

Quantum Blockchain using entanglement in time. Del Rajan (Victoria University of Wellington), Matt Visser (Victoria University of Wellington).  arXiv:1804.05979 [quant-ph]

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