One step closer to quantum teleportation

In many quantum technologies two things work against each other, quantum entanglement and coherence, imagine that they are like the opposing forces seen in two magnets, quantum teleportation generally depends on pairs of perfectly connected particles that are entangled qubits. but it is easily harmed by the coherence that disrupts those connections.

Researchers from the University of Turku in Finland and Hefei China proposed a unique solution to overcome this problem, the new method allows high-quality teleportation to occur Even in turbulent environments, the work is based on the idea of ​​​​distributing entanglement before execute the teleportation protocol, plus the qubits used, that is, explore hybrid entanglement between different physical degrees of freedom.

A quantum particle or qubit can be teleported by moving its state from one place to another without actually transmitting the particle. Quantum resources such as entanglement between an additional pair of qubits are needed for this transmission, in an ideal scenario the state of the qubit can be transferred and teleported perfectly, however, the quality of teleportation is limited and diminished by the noise and disturbances that real-world systems are susceptible to.

Traditionally, photon polarization has been used to entangle qubits in teleportation, but the current method takes advantage of hybrid entanglement resulting from the combination of photon frequency and polarization. This allows a significant change in how noise influences the protocol and in fact this discovery reverses the role of noise from detrimental to beneficial for teleportation.

The team claims that the discovery allows for almost perfect teleportation. Even in the presence of specific types of noise when using photons, in their laboratory the researchers conducted experiments exploring various aspects of quantum physics using photons, however, they highlight that witnessing the successful conclusion This particularly challenging teleportation experience was an immensely exciting and rewarding experience for them.

“This is a significant proof-of-principle experience in the context of one of the most important quantum protocols,” said Juan Feng Lee, professor at the University of Science and Technology of China.

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