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Chinese Journal of Quantum Electronics

Conditional quantum controlled-phase gate between distant atoms in optical cavities

Dingguo Li

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

A scheme is proposed to implement a quantum controlled-phase gate between two four-level atoms inside the different optical cavities.The scheme combines the advantage of scalability from the photon and power of strong atom-photon coupling,which yields the desired unitary evolution operation. The scheme is immune to decoherence due to cavity photon decay and atomic spontaneous emission,and the operation is implemented probabilistically with a very high fidelity.

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A scheme is proposed to implement a quantum controlled-phase gate between two four-level atoms inside the different optical cavities.The scheme combines the advantage of scalability from the photon and power of strong atom-photon coupling,which yields the desired unitary evolution operation. The scheme is immune to decoherence due to cavity photon decay and atomic spontaneous emission,and the operation is implemented probabilistically with a very high fidelity.
We propose a scheme for the implementation of the quantum-controlled phase gate between distant atoms. Two special lasers adiabatically drive an atom trapped in a cavity that unidirectionally couples to the other cavity trapping an atom; then the phase gate between the two atoms is realized by introduction of measurement and local operations. The numerical simulations show that the quality factor of the gate operation is close to unity even if the atomic spontaneous emission is taken into account; the success probability approaches unity in principle.
We propose a scheme for implementing a two-qubit quantum phase gate for intracavity fields. In the scheme, two qubits are encoded in zero- and one-photon Fock states of two intracavity modes, and a four-level N\mathsf{N}N-type atomic ensemble trapped in a cavity mediates the conditional phase gate within a given interaction time. We also discuss the influence of the atomic spontaneous emission and the decay of the cavity modes on the photon loss and gate fidelity, showing the scheme is within the current experiment technology.