A ‘quantum time flip’? Scientist explains how light can travel back and forth in time

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It's more complex than a photon simply 'traveling into the past'.

We reached out to Teodor Strömberg, lead author of the second paper, titled 'Experimental superposition of time directions' to see what he could tell us about how his team’s experiment worked and how their findings could be applied to various fields, including the potentially revolutionary world of quantum computing.

“Both of these analogies are examples of processes where one is the time reverse of the other,” Strömberg continued, “but one can't definitively say which one is the forward time direction, and which is the backward time direction . To get a bit more technical, this is because the processes we implemented conserve entropy.”Superposition is a quantum principle that describes the fact that a quantum system, such as an atom, can exist in two states at the same time until it is observed.

They then formulated a game to determine whether the combined effect of the two rotations changes depending on the spinning direction. The most widely-used framework to describe quantum computation is the quantum circuit model, which is made up of sequences of quantum gates operating on qubits — the quantum computing equivalent of a bit in classical computing.

 

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I'm not going to subscribe to that article. The best a quantum computer can do is instantaneous; effect will never precede cause. Theoretically, a human subject that is near death could be suspended in spacetime until we find a cure; the cure is then transmitted via spooky...

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