中文摘要：

利用囚禁在耦合腔中的三能级原子一步实现了两比特非传统几何相位门.在门操作期间,原子态不演化,而腔模在相空间中沿着一个闭合路径移动,从而获得一个高保真的非传统几何相位门.此方案不需要额外的单量子比特操作,一步完成几何相位门的构建,极大地简化了实验步骤;同时大失谐条件有效地抑制了原子自发辐射,使得方案更具有鲁棒性.数值模拟表明,此方案可以实现高保真度的相位门.

英文摘要：

A one-step scheme is proposed for implementing a two qubit unconventional geometric phase gate with two three-level atomic separately trapped in two coupled cavities.During the gate operation,the two atoms undergo no transitions,while the cavity modes are displaced along a closed path in the phase space.In this way,an unconventional geometric phase is obtained conditioned on the atomic states with a high fidelity.Since no additional single-qubit operation is required,the geometric phase gate is constructed only by one step,which greatly simplifies the experimental implementation.Moreover,the atomic spontaneous emission is effectively suppressed due to large detuning,which makes the scheme robust against decoherence.The numerical simulation shows that a high fidelity can be achieved.