Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-09-17
Science 334, 61-65 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To be published in Science (submitted version); 9 pages+4 figs. (main), 34 pages+12 figs.+3 tables (supplementary); includes T
Scientific paper
10.1126/science.1208517
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.
Bialczak Radoslaw C.
Chen Yafeng
Cleland Andrew N.
Korotkov Alexander N.
Lenander Mike
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