Could the particle itself be its antiparticle? Could that particle have those positions at the same time? Italian physicist Ettore Majorana (1906-possible after 1959) believed that is possible. At least he believed that some particles can turn spontaneously its an antiparticle. We know one group of fermions, Dirac fermions, that have different antiparticles. But there is no clear evidence about the existence of Majorana particles or Majorana fermions. In this text term, Majorana-particle means the same as Majorana fermion.
The reaction that makes a hypothetical Majorana particle interesting is that it can change its spin depending does it face antiparticles or particles. So that kind of particle that spin changes very easily, could have no annihilation. The particle- or antiparticle that comes near that particle can change its spin before annihilation is possible. Annihilation requires that the particle interacts with its mirror particle. And if the spin changes that means there is no annihilation.
Majorana-particle is the particle that is its antiparticle. But it's theoretically possible that the Majorana particle could be at the same time its antiparticle and particle-pair. There is the possibility that the internal superposition of the particle makes this thing possible.
But even if Majorana particles can "only" spontaneously switch their form from anti-particle to particle and oppositely that could be the most fundamental thing in physics. The internal superposition allows researchers to make protected qubits. If particles can have internal superpositions that are making them into their antiparticles. That thing could be a revolution in quantum computing.
But also, if Majorana particles are separated. And they can change their form from particle to antiparticle and oppositely. That makes it possible to transport information between two qubits. The first qubit was made of particle-pair. And the second is made by using anti-particle pairs.
Ettore Majorana (1906- possibly after 1959)
Could there be a particle that has particle- and antiparticle states at the same time?
The superposition is the thing, that makes the quantum computer operate. Theoretically, one single particle can form a quantum computer if that particle has multiple internal superpositions. That means superposition is not necessary between particles. It might be the internal structure of a particle.
This is the reason why researchers are interested in Majorana particles. Those hypothetical particles are themselves their antiparticles. That thing gives possible to create new and powerful quantum computers. The particles like electrons have Majorana-ability. They can change their form to their antiparticles when they travel through the thin gold layer. But spontaneously happening Majorana particles are not seen.
The thing that makes Majorana particle possible is the whisk-looking structure of elementary particles. In that model, the superstrings can change the direction of their spin. And that means the Majorana particle can turn into its antiparticle. Or is the thing so simple? Did Ettore Majorana mean that a particle can turn to its antiparticle?
Or did he mean that particles can be anti-particles and particles at the same time? Could that thing be possible? If superstrings are forming the particle shell. There is the possibility that the particle can be at the same time as its antiparticle. We can call this hypothetical particle a black-and-white particle. But if something forms this thing. Could the internal structure of that particle cause internal annihilation? Or could that particle be stable?
https://en.wikipedia.org/wiki/Ettore_Majorana
https://en.wikipedia.org/wiki/Majorana_fermion
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