Shor's factorization algorithm with a single control qubit and imperfections

Details Shor's factorization algorithm with a single control qubit and imperfections Shor's factorization algorithm with a single control qubit and imperfections

2008-09-25

arxiv.org/abs/0809.4416v1

Phys. Rev. A 78, 062323 (2008)

Physics

Quantum Physics

9 pages 5 figures, and 1 table. Research at http://www.quantware.ups-tlse.fr/

Scientific paper

10.1103/PhysRevA.78.062323

We formulate and numerically simulate the single control qubit Shor algorithm for the case of static imperfections induced by residual couplings between qubits. This allows us to study the accuracy of Shor's algorithm with respect to these imperfections using numerical simulations of realistic quantum computations with up to $n_q=18$ computational qubits allowing to factor numbers up to N=205193. We confirm that the algorithm remains operational up to a critical coupling strength $\epsilon_c$ which drops only polynomially with $\log_2 N$. The obtained numerical dependence of $\epsilon_c$ on $\log_2 N$ is in a good agreement with the analytical estimates that allows to obtain the scaling for functionality of Shor's algorithm on realistic quantum computers with a large number of qubits.

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