The newly developed method links quantum and classical worlds and may enhance measurements for quantum computers and other applications. Our vision is made possible by the specialized cells in our retina that absorb light. But, can one see without any absorption of light or even a single photon?
Aalto University quantum researchers use quantum coherence to detect objects without looking at them. Credit: Mikko Raskinen/Aalto University.
Our vision is made possible by the specialized cells in our retina that absorb light. But, can one see without any absorption of light or even a singleSuppose you have a camera cartridge that could hold a roll of photographic film. The film is so delicate that even a single photon could damage it. Using conventional methods, it’s impossible to determine if there’s film in the cartridge. However, in the quantum world, it can be achieved.
Quantum coherence refers to the possibility that an object can occupy two different states at the same time – something that quantum physics allows for. However, quantum coherence is delicate and easily collapses, so it wasn’t immediately obvious that the new protocol would work. To the team’s pleasant surprise, the first runs of the experiment showed a marked increase in detection efficiency.
The experiment also showed a new way in which quantum devices can achieve results that are impossible for classical devices – a phenomenon known as quantum advantage. Researchers generally believe that achieving quantum advantage will require quantum computers with many qubits, but this experiment demonstrated genuine quantum advantage using a relatively simpler setup.
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