Inconception quantum amount can be stored in ultraclined ‘debit card’

An early quantum debit card that can be pledged to an unforgivable quantum is made of extremely cold atomic and light particles.

In ordinary banks, detecting fake notes is often dependent on the skill of counterfeiting, but a law called a law of physics in a quantum bank makes it impossible for a successful fraud. The law states that copies of quantum information cannot be easily made, and, in 1983, physicist Stephen Wesner developed a protocol that takes advantage of nine cloning theories to create an unforgivable currency. In the Costaller Brucel Laboratory in France, Julian Lort and his colleagues have now implemented the idea in a very modern experience.

In this protocol, a bank notes made of quantum particles that have a special set of features-a specific quantum state-and-not-cloning theory is protected from fraud. Lorty says the protocol itself is a fundamental task in quantum secret care, but it has never been implemented in such a way that the user can store quantum money – quantum states’ fragility means that the user will have to spend immediately.

His team has made such storage possible by integrating memory devices like hard drives into their setup. In their experience, the user interacts with a quantum device that plays the bank’s role by exchanging light particles, or photons. The condition of each photon can be deposited in memory, which is like loading the debit card.

The team’s memory device was manufactured from several hundred million sesame atoms, which researchers collided with lasers and cooled to just a few million dollars to just a few million degrees. At this extreme temperature, the quantum states of the atoms can be very clearly controlled with light, but Lort says it took years to determine that as part of the quantum debit card for the cold from the cold. Through repeated tests, he and his colleagues showed that photon can be effectively recovered from atoms when the user wants to spend his quantum money without being damaged in the process.

Christophe Simon, at the University of Calgary in Canada, says the new experience is a step in the direction of quantum money, but the quantum memory storage time, which is about 6 6 million a second, is still very low for the protocol. “Another [future step] Portability is to increase. I think the long -term purpose, especially in quantum mini context, would be a quantum memory that you can put in your pocket. But we are definitely not there yet, “he says.

Lorty says the team has the eyes on expanding this storage time. In addition, the latest quantum memories can also help to connect ultra -safe long -range quantum communication as well as connect several quantum computers to a more powerful device.