Transmission quantique
New distance record for quantum transmission
A quantum communication has been performed on a record distance of 144 kilometers (The meter (symbol m, the Greek metron, measure) is the basic unit of length in the International System. It ... is defined) through a technique that could one day (the day or the day is the interval between sunrise sunset, it is the period between two ...) used to send encrypted messages through space via a network (A network is a set of equipment linked together to exchange information. By analogy with ...) satellite (Satellite may refer to:).
The "quantum teleportation (teleportation (called teleportation is the transfer of a body in space without physical paths between intermediate points ...) is a quantum technique discussed in the context of quantum information ...)" relates to the "entanglement" (entanglement) of two particles so that any disturbance of the state (quantum) one is instantly reflected on the state of another, even if particles are separated from one another. For this, scientists intriquent a pair (We say that a set E is formed when a pair of two distinct elements a and b, and it is then:) photons and then fire a photon (In particle physics, the photon is the elementary particle mediating the interaction of electromagnetic ....) on one of the two. Interaction (Interaction is an exchange of information, emotions or energy between two agents within a system. ... It's a) resultant changes the state of both entangled photons, "teleporting "as a quantum bit of information - known as the qubit (qubit is called (quantum + bit; pronounced / kyoobit /) sometimes written qbit, the quantum state that represents the most ...) - from one place to another. According to researchers, entangled photons behave as "psychic twins" even if they are well away from each other, changing the quantum state of one affects the other.
During the experiment, pairs of entangled photons were generated from the observatory Roque de los Muchachos on the island of La Palma. While a photon lived in La Palma, his twin was sent by optical link (Optics is the branch of physics that deals with light and its relationship with the vision.) Free space in Tenerife, about 144 km distant, where the optical ground station of ESA was used as a receiver. This is a significant distance of 13 km done before in a similar experience.
The international team of researchers managed to generate a quantum cryptographic key on the record distance of 144 kilometers. They described their experience as "an essential first step towards future quantum communications satellite and conduct experiments of quantum physics in space".
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