High-Fidelity Single-Shot Toffoli Gate via Quantum Control
Abstract
A single-shot Toffoli, or controlled-controlled-NOT, gate is desirable for classical and quantum information processing. The Toffoli gate alone is universal for reversible computing and, accompanied by the Hadamard gate, forms a universal gate set for quantum computing. The Toffoli gate is also a key ingredient for (non-topological) quantum error correction. Currently Toffoli gates are achieved by decomposing into sequentially implemented single- and two-qubit gates, which requires much longer times and yields lower overall fidelities compared to a single-shot implementation. We develop a quantum-control procedure to construct a single-shot Toffoli gate for three nearest-neighbor-coupled superconducting transmon systems such that the fidelity is 99.9% and is as fast as an entangling two-qubit gate under the same realistic conditions. The gate is achieved by a non-greedy quantum control procedure using our enhanced version of the Differential Evolution algorithm.
Cite
@article{arxiv.1501.04676,
title = {High-Fidelity Single-Shot Toffoli Gate via Quantum Control},
author = {Ehsan Zahedinejad and Joydip Ghosh and Barry C. Sanders},
journal= {arXiv preprint arXiv:1501.04676},
year = {2015}
}
Comments
6 pages, 3 figures. Accepted for publication in Phys. Rev. Lett