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Quantum speeding-up of computation demonstrated in a superconducting two-qubit processor

Tue, 2012-03-20 12:23 - Lukas Hanschke
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Date: 
2012-04-05
Author(s): 

A. Dewes, R. Lauro, F.R. Ong, V. Schmitt, P. Milman, P. Bertet, D. Vion, and D. Esteve

Reference: 

Phys. Rev. B 85, 140503(R) (2012)

URL: 

http://link.aps.org/doi/10.1103/PhysRevB.85.140503

We operate a superconducting quantum processor consisting of two tunable transmon qubits coupled by a swapping interaction, and equipped with nondestructive single-shot readout of the two qubits. With this processor, we run the Grover search algorithm among four objects and find that the correct answer is retrieved after a single run with a success probability between 0.52 and 0.67, which is significantly larger than the 0.25 achieved with a classical algorithm. This constitutes a proof of concept for the quantum speed-up of electrical quantum processors.