Implementation of quantum phase gate between two atoms via Rydberg antiblockade and adiabatic passage

• 来源期刊: 中国物理B（英文版）
• 关键词: quantum phase gate Rydberg antiblockade adiabatic passage
• 年，卷（期）: 2018,（10）
• 页码范围: 90-96
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/10/100307

摘要

Combining adiabatic passage and Rydberg antiblockade, we propose a scheme to implement a two-qubit phase gate between two Rydberg atoms. Detuning parameters between frequencies of atomic transitions and those of the corresponding driving lasers are carefully chosen to offset the blockade effect of two Rydberg atoms, so that an effective Hamiltonian, representing a single-photon detuningΛ-type three-level system and concluding the quantum state of two Rydberg atoms excited simultaneously, is obtained. The adiabatic-passage technique, based on the effective Hamiltonian, is adopted to implement a two-atom phase gate by using two time-dependent Rabi frequencies. Numerical simulations indicate that a high-fidelity two-qubitπ-phase gate is constructed and its operation time does not have to be controlled accurately. Besides, owing to the long coherence time of the Rydberg state, the phase gate is robust against atomic spontaneous emission.