Abstract

We propose a scheme for realizing a two-qubit controlled phase gate via an unconventional geometric phase with two nonidentical and spatially separated quantum dots (QDs) trapped in a photonic crystal cavity. In this system, the QDs simultaneously interact with a large detuned cavity mode and strong driving classical light fields. During the gate operation, the QDs undergo no transitions, while the cavity mode is displaced along a closed path in the phase space. In this way, the system can acquire different unconventional geometric phases conditional upon the states of the QDs, and a two-qubit entangling gate can be constructed.

© 2011 Optical Society of America

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