Physics – Quantum Physics
Scientific paper
2011-10-11
Phys. Rev. Lett. 108, 140401 (2012)
Physics
Quantum Physics
Scientific paper
10.1103/PhysRevLett.108.140401
Uncertainty relation for photons that overcomes the difficulties caused by the nonexistence of the photon position operator is derived in quantum electrodynamics. The photon energy density plays the role of the probability density in configuration space. It is shown that the measure of the spatial extension based on the energy distribution in space combined with a measure of the spread in the photon momentum leads to an inequality that is a natural counterpart of the standard Heisenberg relation. Unexpectedly, the equation satisfied by the photon wave function in momentum space which saturates the uncertainty relations has the form of the Schr\"odinger equation in coordinate space in the presence of electric and magnetic charges.
Bialynicka-Birula Zofia
Bialynicki-Birula Iwo
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