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Chinese Physics Letters

One-Step Implementation of Mulitqubit Quantum Phase Gate in a Cavity QED System

Qiu-Bo Fan

Published Feb 1, 2008• 5 citations
Publisher

Abstract

An alternative protocol is proposed to implement three-qubit phase gate between photon and atoms in a high- Q bimodel optical cavity The idea can be extended to directly implement N -qubit phase gate, and the gating time that is required to implement the protocol does not rise with increasing number of qubits. The influence of cavity decay and atomic spontaneous emission on the gate fidelity is also discussed.

DOI
10.1088/0256-307x/25/2/008

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A scheme is proposed to realize a two-qubit quantum phase gate for the intracavity modes. In the scheme, two qubits are encoded in zero- and one-photon Fock states of two intracavity modes, and the three-level $\ensuremath{\Lambda}$-type atom trapped in a high-QQQ cavity mediates the conditional phase gate within a given interaction time. The influence of cavity decay and atomic spontaneous emission on the gate fidelity is also discussed.
We present a one-step scheme for direct implementation of an NNN-qubit controlled-phase gate with atoms trapped in a high-QQQ optical cavity without resorting to a sequence of single- and two-qubit gates. The interaction time that is required to implement the scheme does not rise with increasing number of qubits. This might lead to more efficient construction of quantum circuits and quantum algorithms.