Method proposed to achieve quantum remote control

Technology Review : Although quantum teleportation has been achieved in the laboratory, it has until now involved only single qubits, transmitted one at a time. The reason is that the method involves entanglement, which is a fragile thing. Quantum teleportation is not teleportation in the classical sense, but rather involves a pair of entangled particles. Any measurement done on one of the pair causes its partner to take on the exact same value. Thus the information the first particle carries is transferred to the second one. But the very act of measuring destroys the link between them. Now Christine Muschik of the Mediterranean Technology Park in Barcelona, Spain, and colleagues say they have worked out a method to perform quantum operations continuously on entangled pairs while preserving the quantum characteristics of both particles. They propose that by placing one of a pair of entangled particles in a magnetic field, they could use the field to gently nudge it until it changes value—and thus causes an identical change in value to its entangled partner at some remote location. Because the researchers’ work is entirely theoretical, however, experimental verification has yet to be achieved.