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Phys Rev Lett. 2013 Feb 8;110(6):060503. Epub 2013 Feb 5.

Nonlinear optics quantum computing with circuit QED.

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1
Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA.

Abstract

One approach to quantum information processing is to use photons as quantum bits and rely on linear optical elements for most operations. However, some optical nonlinearity is necessary to enable universal quantum computing. Here, we suggest a circuit-QED approach to nonlinear optics quantum computing in the microwave regime, including a deterministic two-photon phase gate. Our specific example uses a hybrid quantum system comprising a LC resonator coupled to a superconducting flux qubit to implement a nonlinear coupling. Compared to the self-Kerr nonlinearity, we find that our approach has improved tolerance to noise in the qubit while maintaining fast operation.

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