Scientists Report Quantum Teleportation Breakthroughs

PC Magazine, Damon Poeter, August 16, 2013

Two research teams publishing in the current issue of Nature said they have achieved breakthroughs in controlling "quantum teleportation," a process which uses the peculiarities of entangled quantum states in a pair of particles like photons to transfer information from one location to another instantaneously.

Scientists from Japan and Switzerland, in separate studies, produced new research developments which "could change the very face of computing and technological security," according to the National Journal.

The Swiss team, led by Andreas Wallraff of the Quantum Device Lab at the Swiss Federal Institute of Technology Zurich, accomplished "full deterministic quantum teleportation with feed forward" using a "chip-based superconducting circuit architecture," or in other words, a microchip, the scientists said. The upshot is that the device the team created appears to get around a big problem in quantum teleportation—that measuring the particles used in the process, known as qubits, alters them.

The Swiss team crafted a chip with tiny circuits that "each act like an atom," the National Journal reported, explaining that "[t]iny transmission lines connect the circuits and carry microwave radiation, which essentially joins the circuits and their properties to one another." Using this device, the scientists were able to input quantum information into one circuit and cause a signal going to a second circuit to change, then "use that altered signal to determine circuit A's original properties and transfer them to circuit B."

In plainer terms, the scientists were able to reliably "teleport" an electrical current from one circuit to another and measure the changed state with altering it, something no one had accomplished before.

The Japanese team, meanwhile, developed a "hybrid technique involving continuous-variable teleportation of a discrete-variable, photonic qubit." That novel technique minimizes photon loss during the quantum teleportation of information between photons, "allow[ing] for a faithful qubit transfer even with imperfect continuous-variable entangled states," they said.

These developments and other quantum teleportation breakthroughs are seen as key to the maturation of quantum computing and quantum encryption, two related, nascent technologies which theoretically could pave the way for vastly more powerful computers than we have today and uncrackable security protocols to protect the transfer of information between them.

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