Implementing the quantum von Neumann architecture with superconducting circuits

Mariantoni, M. et al. (2011) Implementing the quantum von Neumann architecture with superconducting circuits. Science, 334(6052), pp. 61-65. (doi: 10.1126/science.1208517) (PMID:21885732)

Abstract

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-class 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Weides, Professor Martin
• Authors: Mariantoni, M., Wang, H., Yamamoto, T., Neeley, M., Bialczak, R.C., Chen, Y., Lenander, M., Lucero, E., O'Connell, A.D., Sank, D., Weides, M., Wenner, J., Yin, Y., Zhao, J., Korotkov, A.N., Cleland, A.N., and Martinis, J.M.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Science
• Publisher: American Association for the Advancement of Science
• ISSN: 0036-8075
• ISSN (Online): 1095-9203
• Published Online: 01 September 2011