An easy scheme for implementing conditional logic gate in cavity QED

Taoufik Said, A. Chouikh, Mohamed Bennai

Xi-Zhao Geng, Ying Liu

Hua Wei, Wan Li Yang, Zhi Jiao Deng +1 more

We propose a many-qubit network with cavity QED by encoding qubits in decoherence-free subspace, based on which we can implement many-logic-qubit conditional gates by means of cavity-assisted interaction with single-photon pulses. Our scheme could not only resist collective dephasing errors, but also much reduce the implementational steps compared to conventional methods doing the same job, and we can also complete communications between two arbitrary nodes. We show the details by implementing a three-logic-qubit Toffoli gate and explore the experimental feasibility and challenge based on currently achievable cavity QED technologies.

Dawei Zhang, Shao Xiao-Qiang, Ai‐Dong Zhu

A quantum logic network is constructed to simulate a cloning machine which copies states near a given one. Meanwhile, a scheme for implementing this cloning network based on the technique of cavity quantum electrodynamics (QED) is presented. It is easy to implement this network of cloning machine in the framework of cavity QED and feasible in the experiment.

Bao‐Long Fang, Hong-Bo Wan, Ye Liu

We propose a simple scheme for realizing two-qubit logic gate in cavity QED. In our scheme, the quantum controlled-not gate, phase gate and swap gate can be implemented without the ancillary level. The quantum controlled-not gate and phase gate can be realized easily by only one interaction between atoms and a highly detuned cavity mode with the assistance of a strong classical field. Thus, the scheme is insensitive to both the cavity decay and the thermal field.

李蓬勃, 古英, 龚旗煌 +1 more