约瑟夫森结中两能级系统的可控相互作用
A Controllable Interaction between Two-Level Systems inside a Josephson Junction
摘要：
在超导相位量子比特的光谱测量中，约瑟夫森结隧道势垒中的二能级系统涨落（TLS）最近被证明会引起新的能量分裂。由于它们与约瑟夫森结的强耦合和相对较长的退相干时间，TLS可以被认为是潜在的量子比特，并表现出相干的量子效应。在这里，我们研究了TLS量子比特之间的有效相互作用，介导的约瑟夫森结谐振器由外部微波源驱动。这种有效的相互作用可以实现TLS之间的受控量子逻辑门。我们的研究可以推广到其他与TLS耦合的超导谐振器。
英文摘要：
Two-level system fluctuators (TLS's) in the tunnel barrier of a Josephson junction have recently been demonstrated to cause novel energy splittings in spectroscopic measurements of superconducting phase qubits. With their strong coupling to the Josephson junction and relatively long decoherence times, TLS's can be considered as potential qubits and demonstrate coherent quantum effects. Here, we study the effective interaction between the TLS qubits that is mediated by a Josephson junction resonator driven by an external microwave source. This effective interaction can enable controlled quantum logic gates between the TLS's. Our study can be extended to other superconducting resonators coupling with TLS's.
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