Live demonstration of single photon interference

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Live demonstration of single photon interference at IIT Kanpur as part of courses PHY431 and PHY690G
  1. Quantum Optics and Entanglement Lab, IIT Kanpur
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I congratulate the team for demonstrating this interference of a single photon.

malleshks
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Around the instant of time 22m 37s, the speaker says " If you have only one photon in the system, then it either goes through this or through and continues to amplify the same. I can't agree with the speaker that if there is one photon, it can go through only one of the two slits. If we have one photon, does the speaker think that it will be a particle of very small size? I think quantum mechanics says that any quantum system, including a single photon, can't be treated as localized until it is measured. The speaker continues to stick to his idea by supposing that the energy can't be split. He continues to say that the wave function can be split but not the energy. I wish the speaker clarifies here whether it is right to say that the photon goes through one of the slits and not both. May be the speaker wants to convey some idea but what he has said seems to be not conveying his intended meaning and more so it is incorrect. I wish to stand corrected if I am wrong.

malleshks
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1ST TIME I HAAVE UNDERSTOOD SOMETHING ABOUT WAVE .STILL NOT EVERYTHING BUT YES IT WILL WORK .
THANX.

harshwithtruth