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The Oxford team can create individual photons that are 65 femtoseconds in duration: thatís approximately fifty times shorter than any single photon previously produced.
Doesn't that mean that previous single photon is actually 50 photons in a row?
No it's the pulse duration from beginning to end?
every photon this source produces is identical to the previous one.
if they have same frequency then long duration photons will have less power (energy per unit time) than shorter one?
If we assume that the wavelength is 600 nm (red), then the 56 femtosecond pulse will contain 28 waves, since in 1 femtosecond light travels approximately 300 nm.