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Chinese journal of atomic and molecular physics

Realization of a quantum phase gate using two nonidentical atoms in a highly-detuned cavity

Chao-Yang Pang

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

We have discussed the system that consists of two nonidentical two-level atoms trapped simultaneously in a large-detuned single-mode cavity field in this paper.The results show that it is possible to realize a fast quantum phase gate by using two nonidentical two-level atoms,only if the cavity frequency and difference of two nonidentical atoms transition frequency are selected,and the cavity-atom interaction time is controlled appropriately.The scheme does not require the auxiliary level.

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We have discussed the system that consists of two nonidentical two-level atoms trapped simultaneously in a large-detuned single-mode cavity field in this paper.The results show that it is possible to realize a fast quantum phase gate by using two nonidentical two-level atoms,only if the cavity frequency and difference of two nonidentical atoms transition frequency are selected,and the cavity-atom interaction time is controlled appropriately.The scheme does not require the auxiliary level.
We propose a scheme for realizing two-qubit controlled phase gates on two nonidentical quantum dots trapped in separate cavities. In our scheme, each dot simultaneously interacts with one highly detuned cavity mode and two strong driven classical fields. During the gate operation, the quantum dots undergo no transition, while the system can acquire different phases conditional on different states of the quantum dots. With the application of the single-qubit operations, two-qubit controlled phase gates can be realized.
We discuss how to implement quantum logic gates by considering a two-level-atom driven by a strong microwave field and successively interacting with m+1 cavity modes. The scheme is insensitive to the initial state of the atom, and the operation time is independent of the number of cavity modes involved in the system operations. This scheme is used to realize two quantum logic gates (m-target-qubit controlled-global-phase gate and Multi-qubit phase shift gate) in a time much shorter than the photonic lifetime. We also studied the influence of decoherence on the fidelity. In general, our system is reasonably less sensitive to the photonic and atomic decay rates and therefore it can be experimentally realized.