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Quantum dots in semiconductors can be used for computation and teleportation
While scientists are coming up with more and more new ways to create quantum computers, a phenomenon no less interesting from a scientific point of view, quantum dots, can find application in teleportation – of course, also in quantum. Recall that the term “quantum teleportation” means the transfer of the quantum state of matter (in the particular case, individual atoms) in the form of not quite material electromagnetic radiation (namely, in the form of a photon with a certain energy, phase and polarization). In addition to its purely scientific value, this type of research activity is also very important for quantum cryptography that has already found practical application.
Scientists from Singapore’s Nanyang University of Technology report the results of a theoretical study of the properties of semiconductor quantum dots – nanoscopic objects containing, however, up to several thousand atoms. However, due to the fact that their wave functions in quantum dots are limited, these thousands of atoms behave like a single atom, at the same time, providing a more convenient class of objects for experiments (classical experiments with single atoms are most often carried out using magnetic traps).
The researchers described the process of transferring the quantum state of one point to another, as well as the dependence of the “entanglement” of states on the “quality” of teleportation. Recall that “entangled” quantum states have a common wave function, as a result of which manipulations on one state lead to the modification of another (this is the key principle in quantum cryptographic systems). Scientists have shown that with an increase in the degree of “entanglement” of the states of two quantum dots, the “quality of teleportation” will have to fall, which, in general, is quite understandable – when both states are identical, there is no need to transfer anything between the two quantum dots.
And although this work is theoretical, the researchers nevertheless gave their thoughts on how to create such quantum dots using self-assembly technologies at room temperature. What is also very important, scientists have estimated such a parameter as the time of decohering and believe that semiconductor quantum dots may well function as elements of a quantum computer at room temperature. However, the final answer to the question – is it good or bad for quantum computing and cryptography, only experiment.