Quantum networks could allow information to be transmitted without the risk of eavesdropping. But quantum information is fragile and can easily be destroyed en route. Because quantum mechanics forbids making exact copies of an unknown quantum state, once the information is lost, it’s lost for good. To overcome this problem, physicists rely on quantum teleportation to securely transfer unknown quantum states using shared entanglement. Now Jietai Jing of East China Normal University and colleagues have demonstrated a quantum-teleportation scheme with a much greater bandwidth than conventional techniques [1].
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