In the EPR paradox scenario, two photons are produced with equal and opposite momentum and energy; if one measures the wavelength of photon one (a wave property), one instantly knows the wavelength of photon two without measuring it, but if one measures the position of photon one (a particle property), one instantly knows the position of photon two.

factualpending

Speaker

Jim Al-Khalili

Evidence Quote

[13:54] imagine you have uh uh some device that produces two particles of light, two photons, and it sends them out back to back equal and uh opposite momenta, equal energies...if you measure the wavelength of photon one...you instantly know without measuring anything to do with photon 2 you know what its wavelength is...if you know where photon one is, photon 2 will also be behaving like a particle

Source

The mind-bending reality of quantum mechanics - with Jim Al KhaliliThe Royal Institution
Created: 8/11/2026, 5:36:17 AM

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