论文标题
从电路的连贯状态产生纠缠状态
Generating entangled states from coherent states in circuit-QED
论文作者
论文摘要
纠缠状态对于量子通信和量子信息处理中的广泛应用而言至关重要。我们提出了一种有效且方便的两步方案，用于从仅相干状态产生两个微波谐振器的钟状状态和中午状态。特别是，我们得出了一个有效的哈密顿谐音，用于谐振器与分散式制度中的$λ$ - 型Qutrit相连。通过QUTRIT过渡频率的激发依赖性依赖性的Stark偏移，我们能够使用仔细量身定制的微波驱动信号来单独控制与相关QUTRIT过渡相关的谐振器指定的Fock状态的幅度。因此，可以通过典型的进化和测量程序来生成一个任意的双方纠缠状态。我们分析了不需要的状态转换和协议对微波驱动强度和频率的系统错误的鲁棒性，所有组件的量子反应性以及两个谐振器的串扰。此外，我们证明我们的协议可以通过$ξ$ -Type Qutrit扩展到类似的情况。
Entangled states are self-evidently important to a wide range of applications in quantum communication and quantum information processing. We propose an efficient and convenient two-step protocol for generating Bell states and NOON states of two microwave resonators from merely coherent states. In particular, we derive an effective Hamiltonian for resonators coupled to a superconducting $Λ$-type qutrit in the dispersive regime. By the excitation-number-dependent Stark shifts of the qutrit transition frequencies, we are able to individually control the amplitudes of specified Fock states of the resonators associated with relevant qutrit transition, using carefully tailored microwave drive signals. Thereby an arbitrary bipartite entangled state in Fock space can be generated by a typical evolution-and-measurement procedure. We analysis the undesired state transitions and the robustness of our protocol against the systematic errors from the microwave driving intensity and frequency, the quantum decoherence of all components, and the crosstalk of two resonators. In addition, we demonstrate that our protocol can be extended to a similar scenario with a $Ξ$-type qutrit.
