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Nam, Y. Examples are quantum adders and subunits of quantum modulo adders.
We'll Be in a Solid Place Entering 2019, Says Novartis' CEO
In this paper we show, both analytically and numerically, that if, in analogy to spin echoes, F and F-1 can be implemented symmetrically when executing Shor's algorithm on actual, imperfect quantum hardware, such that F and F-1 have the same hardware errors, a symmetry boost in the fidelity of the combined F U F-1 quantum operation results when compared to the case in which the errors in F and F-1 are independently random.
Running the complete gate-by-gate implemented Shor algorithm, we show that the symmetry-induced fidelity boost can be as large as a factor 4.
While most of our analytical and numerical results concern the case of over- and under-rotation Novartis tootajate jagamise tehingud controlled rotation gates, in the numerically accessible case of Shor's algorithm with a small number of qubits, we show explicitly that the symmetry boost is robust with respect to more general types of errors. The Lorentzian shape also shows that, while the boost factor may become small with increasing δit declines slowly essentially like a power law and is never completely erased.
We also investigate the effect of diagonal nonunitary errors, which, in analogy to unitary errors, reduce but never erase the symmetry boost. Going beyond the case of small quantum processors, we present analytical scaling results that show that the symmetry boost persists in the practically interesting case of a large number of qubits.
We illustrate this result.