A new paradigm in quantum information processing has been demonstrated by physicists at UC Santa Barbara. Their results are published in this week's issue of *Science Express* online.

UCSB physicists have demonstrated 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.

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## CHollman82

## flashgordon

What you should be saying is good night classical Newtonian mechanics world!

## finitesolutions

## Pete1983

I'm not sure it would be any different, because we exist in a non-quantum state. Although potentially we're always both winning and losing if you take the multiverse view (which I do, I mean, why wouldn't you? It's just too fun, also QM makes more sense with a multiverse).

Also on an unrelated note, UCSB is the new CMOS? Or at least close to anyway. This is really amazing stuff, I mean, a PROPER integrated quantum circuit!?!?!!? I'm sure I'm not the only one here who is a bit aroused.

## xamien

I'd say that I am, too, but it's a quantum state of arousal. I am simultaneously aroused and not-aroused, at least until my wife measures me. ;)

## antialias_physorg

They still need to cool it down to very low temperatures. Don't expect this to replace CMOS just yet.

## Pete1983

Oh I agree completely. However if and when this does become a commercial technology, I wonder whether the term UCSB will remain. The term CMOS has been around for a long time, so potentially it could carry on through.

## Callippo