Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit
Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit
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超导量子电路中的光学选择规则和相相关绝热状态控制
DOI：
10.1103/physrevlett.95.087001
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发表时间：
2005-08-19
影响因子：
8.6
通讯作者：
Nori, F
中科院分区：
文献类型：
--
作者：
Liu, YX;You, JQ;Nori, F
分析了磁通量子比特超导量子电路（SQC）中微波辅助跃迁的光学选择规则。当外磁通量Phi（e）=Phi（0）/2时，SQC中与超导相有关的态的宇称是确定的，其选择规则与通常原子的电偶极跃迁的选择规则相同.当Phi（e）不等于Phi（0）/2时，人造“原子”势的对称性被打破，形成所谓的Delta型“循环”三能级原子，其中单光子过程和双光子过程可以共存。我们研究了如何通过电磁场脉冲的控制来选择性地转移这三个态的布居数。与λ型原子不同，三能级Delta原子中的绝热布居转移不仅可以由脉冲的振幅控制，还可以由脉冲的相位控制。
We analyze the optical selection rules of the microwave-assisted transitions in a flux qubit superconducting quantum circuit (SQC). We show that the parities of the states relevant to the superconducting phase in the SQC are well defined when the external magnetic flux Phi(e)=Phi(0)/2; then the selection rules are the same as the ones for the electric-dipole transitions in usual atoms. When Phi(e)not equal Phi(0)/2, the symmetry of the potential of the artificial "atom" is broken, a so-called Delta-type "cyclic" three-level atom is formed, where one- and two-photon processes can coexist. We study how the population of these three states can be selectively transferred by adiabatically controlling the electromagnetic field pulses. Different from Lambda-type atoms, the adiabatic population transfer in our three-level Delta atom can be controlled not only by the amplitudes but also by the phases of the pluses.