Quantum Steering Allows Secure Quantum Teleportation
Quantum Teleportation has been studied by scientists for many years and now they fully understand how to deliver this. They make use of a phenomenon called Quantum Steering which was first suggested by Albert Einstein and Erwin Schrödinger. Although the word teleportation sounds incredibly exciting it only applies to using quantum entanglement to send information securely over long distances. This would potentially provide a completely secure communications for the future.
How is this done? Read on to find out.
Quantum teleportation isn’t new in itself. Researchers have already had a lot of success quantum teleporting information over 100 km of fibre. But there’s a slight issue – the quantum message was getting to the other end kinda incoherent, and scientists haven’t exactly known what to do to prevent that from happening, until now.
“Teleportation works like a sophisticated fax machine, where a quantum state is transported from one location to another,” said one of the researchers, Margaret Reid, from Swinburne University of Technology in Australia.
“Let’s say ‘Alice’ begins the process by performing operations on the quantum state – something that encodes the state of a system – at her station. Based on the outcomes of her operations, she communicates (by telephone or public Internet) to ‘Bob’ at a distant location, who is then able to create a replica of the quantum state,” she explains.
“The problem is that unless special requirements are satisfied, quantum mechanics demands that the state at Bob’s end will be ‘fuzzed up’.”
The researchers have now shown that to avoid this, Alice and Bob (or anyone else who wants to send an entangled message) need to use a special form of quantum entanglement known as ‘Einstein-Podolsky-Rosen steering’.
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