2011/09/02 by M. Mariantoni, Matteo Mariantoni, H. Wang +22 · 5 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.mes-hall #physics.atom-ph #quant-ph
paper · pdf · doi:10.1126/science.1208517
published as Science 334, 61-65 (2011) · To be published in Science (submitted version); 9 pages+4 figs. (main), 34 pages+12 figs.+3 tables (supplementary); includes Toffoli gate+quantum Fourier transform
openalex publication_date 2011/09/02 · arxiv created 2011/09/17 · arxiv updated 2011/10/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The von Neumann architecture for a classical computer comprises a central processing unit and a memory holding instructions and data. We demonstrate a quantum central processing unit that exchanges data with a quantum random-access memory integrated on a chip, with instructions stored on a classical computer. We test our quantum machine by executing codes that involve seven quantum elements: Two superconducting qubits coupled through a quantum bus, two quantum memories, and two zeroing registers. Two vital algorithms for quantum computing are demonstrated, the quantum Fourier transform, with 66% process fidelity, and the three-qubit Toffoli OR phase gate, with 98% phase fidelity. Our results, in combination especially with longer qubit coherence, illustrate a potentially viable approach to factoring numbers and implementing simple quantum error correction codes.