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" ... I have a question about Quantum fields. If we model particle properties as excitations of various independent fields (Higgs field for mass, EM field for charge etc) then what causes these excitation waves to travel around together? Is there really some kind of particle entity underlying these waves? ... "
" ... If, however, you shift the photon to either longer or shorter wavelengths — regardless of how you do it — you won’t be able to absorb it anymore. The laws of the quantum Universe are pretty rigid, and if a photon comes in with slightly too much or too little energy, it won’t trigger the proper excitation. ... "
" ... Schematic of the Rydberg blockade scheme. Left: two ground-state atoms don't affect each other, and... [+] can be excited by a laser (green arrow). Middle: Once one atom is excited, it shifts the energy levels of the other, blocking the laser excitation. Right: The entangled state that results from putting the first atom in a superposition and then trying to excite the second. (Figure by Chad Orzel) ... "
" ... The restoration of long-term memory function combined with the restoration of excitation and neural plasticity at the synapse that was observed in these experiments indicates that the memory deficits that are symptomatic of Alzheimer's disease may be reversible if the Dkk1 block on Wnt signaling can be removed before the destruction of neurons takes place. ... "