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arXiv 0912.0089quant-ph
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利用修饰超导量子比特实现电磁感应透明和吸收

Tunable Electromagnetically Induced Transparency and Absorption with Dressed Superconducting Qubits

Hou Ian, Yu-xi Liu, Franco Nori

备注：
13 pages
发表信息：
Phys. Rev. A 81, 063823 (2010)
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摘要：

电磁感应透明和吸收（EIT和EIA）通常是由三能级原子或类原子系统来证明的。与通常的情况不同，我们从理论上研究了单模腔场修饰超导二能级系统（量子比特）构成的等效三能级系统中的EIT和EIA。在这个等效系统中，我们发现EIT和EIA都可以通过控制超导量子比特的能级间距来调谐，从而控制修饰系统。这种可调谐性是由于修饰的弛豫和退相速率随原始量子比特的能级间距参数化地变化，从而影响修饰量子比特的跃迁性质和磁化率。这些修饰的弛豫和退相速率表征修饰的量子比特对入射探测场的反应。我们还使用最近的超导量子比特（电荷，相位和磁通量子比特）的实验数据来证明我们的方法，并显示实验实现这一建议的可能性。

英文摘要：

Electromagnetically induced transparency and absorption (EIT and EIA) are usually demonstrated by three-level atomic or atom-like systems. In contrast to the usual case, we theoretically study the EIT and EIA in an equivalent three-level system, which is constructed by dressing a superconducting two-level system (qubit) dressed by a single-mode cavity field. In this equivalent system, we find that both the EIT and the EIA can be tuned by controlling the level-spacing of the superconducting qubit and hence controlling the dressed system. This tunability is due to the dressed relaxation and dephasing rates which vary parametrically with the level-spacing of the original qubit and thus affect the transition properties of the dressed qubit and the susceptibility. These dressed relaxation and dephasing rates characterize the reaction of the dressed qubit to an incident probe field. We also use recent experimental data on superconducting qubits (charge, phase, and flux qubits) to demonstrate our approach and show the possibility of experimentally realizing this proposal.

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