论文标题
异步激发量子的分布式纠缠产生
Distributed entanglement generation from asynchronously excited qubits
论文作者
论文摘要
GHz状态的产生要求同时激发多个量子位。这种状态的特殊性反映在其非零分布式纠缠中，而其他纠缠状态不包含。我们研究了通过电路中的公共腔谐振器激发三个超导量子的最佳方法，以便可以以最高程度的方式以最高程度的方式获得分布式纠缠的产生。量化此纠缠的非负措施是四分之一系统演化的时间函数。我们发现该措施不保持静态，而是定期获得相同的最大值。当允许量子谐振器耦合变化时，通过将最大的耦合强度提高到其中一个Qubits，可以单调地增强其峰值。当耦合变得不均匀时，量子激发的峰值峰值的峰值最大化，因此量子激发变得异步，相对比为0.35。该研究证明了异步激发在时间控制的多量系统中的作用，尤其是在延长纠缠时间中。
The generation of GHZ states calls for simultaneous excitation of multiple qubits. The peculiarity of such states is reflected in their nonzero distributed entanglement which is not contained in other entangled states. We study the optimal way to excite three superconducting qubits through a common cavity resonator in a circuit such that the generation of distributed entanglement among them could be obtained at the highest degree in a time-controllable way. A non-negative measure quantifying this entanglement is derived as a time function of the quadripartite system evolution. We find that this measure does not stay static but obtains the same maximum periodically. When the qubit-resonator couplings are allowed to vary, its peak value is enhanced monotonically by increasing the greatest coupling strength to one of the qubits. The period of its peak to peak revival maximizes when the couplings become inhomogeneous, thus qubit excitation becoming asynchronous, at a relative ratio of 0.35. The study demonstrates the role of asynchronous excitations for time-controlling multi-qubit systems, in particular in extending entanglement time.
