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When light and atoms share a common vibe
Scientists from EPFL, MIT, and CEA Saclay demonstrate a state of vibration that exists simultaneously at two different times. They evidence this quantum superposition by measuring the strongest class of quantum correlations between light beams that interact with the vibration.
An especially counter-intuitive feature of quantum mechanics is that a single event can exist in a state of superposition – happening bothhereandthere, or bothtodayandtomorrow.
Such superpositions are hard to create, as they are destroyed if any kind of information about the place and time of the event leaks into the surrounding – and even if nobody actually records this information. But when superpositions do occur, they lead to observations that are very different from that of classical physics, questioning down to our very understanding of space and time.
A state of vibration that exists simultaneously at two different times
When light and atoms share a common vibe.
Credit: EPFL
Quantum mechanics has an exciting feature: a single event can exist in a state of superposition – happening bothhereandthere, or bothtodayandtomorrow.
Such superposition is quite challenging to create as they are easily destroyed if any information about the event’s place and time leaks into the surrounding – and even if nobody records this information. Once superposition is created, they lead to observations that are very different from that of classical physics, questioning down to our very understanding of space and time.
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VIDEO: 1. A laser generates a very short pulse of light
2. A fraction of this pulse is sent to a nonlinear device to change its color
3. The two laser pulses overlap. view more
Credit: Santiago Tarrago Velez (EPFL)
An especially counter-intuitive feature of quantum mechanics is that a single event can exist in a state of superposition - happening both here and there, or both today and tomorrow.
Such superpositions are hard to create, as they are destroyed if any kind of information about the place and time of the event leaks into the surrounding - and even if nobody actually records this information. But when superpositions do occur, they lead to observations that are very different from that of classical physics, questioning down to our very understanding of space and time.
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