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Spectrum of a superconducting phase qubit coupled to a microscopic two-level system

Zhican, Du, Xueda +9 more

中国科学通报：英文版Jan 1, 20140 citations

Probing coupling mechanism between microscopic two-level system and superconducting qubits

Yang Woo Yu, Zhentao Zhang

Bulletin of the American Physical SocietyMar 1, 20120 citations

Coupling mechanism between microscopic two-level system and superconducting qubits

Zhentao Zhang, Yang Yu

We propose a scheme to clarify the coupling nature between superconducting Josephson qubits and microscopic two-level systems. Although dominant interest in studying two-level systems was in phase qubits previously, we find that the sensitivity of the generally used spectral method in phase qubits is not sufficient to evaluate the exact form of the coupling. On the contrary, our numerical calculation shows that the coupling strength changes remarkably with the flux bias for a flux qubit, providing a useful tool to investigate the coupling mechanism between the two-level systems and qubits.We propose a scheme to clarify the coupling nature between superconducting Josephson qubits and microscopic two-level systems. Although dominant interest in studying two-level systems was in phase qubits previously, we find that the sensitivity of the generally used spectral method in phase qubits is not sufficient to evaluate the exact form of the coupling. On the contrary, our numerical calculation shows that the coupling strength changes remarkably with the flux bias for a flux qubit, providing a useful tool to investigate the coupling mechanism between the two-level systems and qubits.

arXiv:1212.2687Physical Review ADec 19, 20116 citations

Phase Qubit on a Superconducting

I. N. Askerzade, Emrah Amrahov

Jan 1, 20100 citations

Quantum dynamics of a microwave driven superconducting phase qubit coupled to a two-level system

Guozhu Sun, Xueda Wen, Bo Mao +4 more

We present an analytical and comprehensive description of the quantum dynamics of a microwave resonantly driven superconducting phase qubit coupled to a microscopic two-level system (TLS), covering a wide range of the external microwave field strength. Our model predicts several interesting phenomena in such an ac driven four-level bipartite system including anomalous Rabi oscillations, high-contrast beatings of Rabi oscillations, and extraordinary two-photon transitions. Our experimental results in a coupled qubit-TLS system agree quantitatively very well with the predictions of the theoretical model.We present an analytical and comprehensive description of the quantum dynamics of a microwave resonantly driven superconducting phase qubit coupled to a microscopic two-level system (TLS), covering a wide range of the external microwave field strength. Our model predicts several interesting phenomena in such an ac driven four-level bipartite system including anomalous Rabi oscillations, high-contrast beatings of Rabi oscillations, and extraordinary two-photon transitions. Our experimental results in a coupled qubit-TLS system agree quantitatively very well with the predictions of the theoretical model.

arXiv:1004.4664Physical Review BOct 1, 201014 citations

Rapid characterization of microscopic two-level systems using Landau-Zener transitions in a superconducting qubit

Xinsheng Tan, Haifeng Yu, Yang Yu +1 more

We demonstrate a fast method to detect microscopic two-level systems in a superconducting phase qubit. By monitoring the population leak after sweeping the qubit bias flux, we are able to measure the two-level systems that are coupled with the qubit. Compared with the traditional method that detects two-level systems by energy spectroscopy, our method is faster and more sensitive. This method supplies a useful tool to investigate two-level systems in solid-state qubits.

Applied Physics LettersSep 7, 20156 citations

Spectrum of a superconducting phase qubit coupled to a microscopic two-level system

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