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Physicists demonstrate quantum integrated circuit that implements quantum von Neumann architecture

Date:
September 2, 2011
Source:
University of California - Santa Barbara
Summary:
A new paradigm in quantum information processing has been demonstrated. Physicists have developed a quantum integrated circuit that implements the quantum von Neumann architecture. In this architecture, a long-lived quantum random access memory can be programmed using a quantum central processing unit, all constructed on a single chip, providing the key components for a quantum version of a classical computer.

The quantum von Neumann machine: Two qubits are coupled to a quantum bus, realizing a quCPU. Each qubit is accompanied by a quantum memory as well as a zeroing register. The quantum memories together with the zeroing register realize the quRAM.
Credit: Peter Allen, UCSB

A new paradigm in quantum information processing has been demonstrated by physicists at UC Santa Barbara.

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Their results are published online in the journal Science.

The UCSB physicists have developed a quantum integrated circuit that implements the quantum von Neumann architecture. In this architecture, a long-lived quantum random access memory can be programmed using a quantum central processing unit, all constructed on a single chip, providing the key components for a quantum version of a classical computer.

The UCSB hardware is based on superconducting quantum circuits, and must be cooled to very low temperatures to display quantum behavior. The architecture represents a new paradigm in quantum information processing, and shows that quantum large-scale-integration is within reach.

The quantum integrated circuit includes two quantum bits (qubits), a quantum communication bus, two bits of quantum memory, and a resetting register comprising a simple quantum computer. "Computational steps take a few billionths of a second, comparable to a classical computer, but the great power is that a quantum computer can perform a large number of calculations simultaneously," said Matteo Mariantoni, postdoctoral fellow in the Department of Physics. "In our new UCSB architecture we have explored the possibility of writing quantum information to memory, while simultaneously performing other quantum calculations.

"On the quantum von Neumann architecture, we were able to run the quantum Fourier transform and a three-qubit Toffoli gate -- key quantum logic circuits for the further development of quantum computing," said Mariantoni.

The UCSB experiment was pursued primarily by Mariantoni, under the direction of Andrew N. Cleland and John M. Martinis, both professors of physics. Mariantoni was supported in this work by an Elings Prize Fellowship in Experimental Science from UCSB's California NanoSystems Institute.


Story Source:

The above story is based on materials provided by University of California - Santa Barbara. Note: Materials may be edited for content and length.


Journal Reference:

  1. Matteo Mariantoni, H. Wang, T. Yamamoto, M. Neeley, Radoslaw C. Bialczak, Y. Chen, M. Lenander, Erik Lucero, A. D. O'Connell, D. Sank, M. Weides, J. Wenner, Y. Yin, J. Zhao, A. N. Korotkov, A. N. Cleland, John M. Martinis. Implementing the Quantum von Neumann Architecture with Superconducting Circuits. Science, 2011; DOI: 10.1126/science.1208517

Cite This Page:

University of California - Santa Barbara. "Physicists demonstrate quantum integrated circuit that implements quantum von Neumann architecture." ScienceDaily. ScienceDaily, 2 September 2011. <www.sciencedaily.com/releases/2011/09/110901155259.htm>.
University of California - Santa Barbara. (2011, September 2). Physicists demonstrate quantum integrated circuit that implements quantum von Neumann architecture. ScienceDaily. Retrieved December 19, 2014 from www.sciencedaily.com/releases/2011/09/110901155259.htm
University of California - Santa Barbara. "Physicists demonstrate quantum integrated circuit that implements quantum von Neumann architecture." ScienceDaily. www.sciencedaily.com/releases/2011/09/110901155259.htm (accessed December 19, 2014).

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