Abstract
In theory, so long as there is no noise and no gates are applied, an arbitrary state of N qubits remains intact. This is true only if the energies of all qubits are exactly equal, which is hadrly possible. Otherwise, there will be a free evolution of the system defined by its energy spectrum. Also it is still not possible to factor the number 15 by Shor’s algorithm, and error correction is still non-existant.
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Notes
- 1.
The aversion of QC theorists to demonstrating how their methods are supposed to work in the simplest situations is reminiscent of the magician episode described by Twain [63]. The magician could easily tell what the Emperor of the East was doing, but could not guess what the Yankee was doing with his right hand. If you don’t know how to protect from errors just one qubit, how can you talk about scalable fault-tolerant quantum computation with millions of qubits?
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Dyakonov, M.I. (2020). More Problems with Quantum Computing. In: Will We Ever Have a Quantum Computer?. SpringerBriefs in Physics. Springer, Cham. https://doi.org/10.1007/978-3-030-42019-2_5
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DOI: https://doi.org/10.1007/978-3-030-42019-2_5
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