Communication: Engineered tunable decay rate and controllable dissipative dynamics
Communication: Engineered tunable decay rate and controllable dissipative dynamics
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通信：工程可调衰减率和可控耗散动力学
DOI：
10.1063/1.3700437
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发表时间：
2012-03-28
影响因子：
4.4
通讯作者：
Zheng, Hang
中科院分区：
文献类型：
--
作者：
Lu, Zhiguo;Zheng, Hang
利用量子振子自旋玻色子模型描述的辅助隧穿自由度的调制，研究了二能级系统（量子比特）的操纵耗散动力学。我们的结果表明，量子比特的退相干率可以显着抑制，同时其品质因数提高。此外，调制的动态磁化率表现出多峰特征，这是指示的基础结构和可测量的实验。我们的研究结果表明，组合自由度和量子比特之间的相互作用是至关重要的减少量子比特的耗散和扩展量子操作的相干制度大得多。该策略可用于对抗量子信息处理中量子相干性的恶化。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.3700437]
We investigate the steering dissipative dynamics of a two-level system (qubit) by means of the modulation of an assisted tunneling degree of freedom which is described by a quantum-oscillator spin-boson model. Our results reveal that the decoherence rate of the qubit can be significantly suppressed and simultaneously its quality factor is enhanced. Moreover, the modulated dynamical susceptibility exhibits a multi-peak feature which is indicative of the underlying structure and measurable in experiment. Our findings demonstrate that the interplay between the combined degrees of freedom and the qubit is crucial for reducing the dissipation of qubit and expanding the coherent regime of quantum operation much large. The strategy might be used to fight against deterioration of quantum coherence in quantum information processing. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700437]