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self-energy
(redirected from Quantum particle)

    Also found in: Wikipedia 0.03 sec.
self-energy [¦self ′en·ər·jē]
(physics)
Classically, the contribution to the energy of a particle that arises from the interaction between different parts of the particle.
In a quantized field theory, the contribution to the energy of a particle due to virtual emission and absorption of other particles, in particular, mesons and photons.
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Distinguishing between them is impossible using only single particle inputs because the outputs are not distinguishable: a fundamental consequence of the laws of quantum mechanics is that only very few states of a quantum particle can be reliably distinguished from one another.
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Quantum particles cannot be measured without being disturbed, so any attempt to intercept a quantum message and then retransmit it would inevitably change the message in a way that would reveal the interference.
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