Instituto de Física Fundamental, CSIC, Serrano 113-bis, 28006 Madrid, Spain.
Phys Rev Lett. 2010 Jul 9;105(2):023601. doi: 10.1103/PhysRevLett.105.023601. Epub 2010 Jul 6.
We propose different designs of switchable coupling between a superconducting flux qubit and a microwave transmission line. They are based on two or more loops of Josephson junctions which are directly connected to a closed (cavity) or open transmission line. In both cases the circuit induces a coupling that can be modulated in strength, reaching the so-called ultrastrong coupling regime in which the coupling is comparable to the qubit and photon frequencies. Furthermore, we suggest a wide set of applications for the introduced architectures.
我们提出了超导磁通量子比特与微波传输线之间可切换耦合的不同设计。它们基于直接连接到闭合（腔）或开放传输线的两个或更多约瑟夫森结环。在这两种情况下，该电路都会感应出一种可以调节强度的耦合，达到所谓的超强耦合状态，其中耦合与量子比特和光子频率相当。此外，我们为引入的架构提出了广泛的应用。
