Two-photon probe of the Jaynes-Cummings model and controlled symmetry breaking in circuit QED

被引：161

作者：

Deppe, Frank ^{[1
,2
]}

Mariantoni, Matteo ^{[1
]}

Menzel, E. P. ^{[1
]}

Marx, A. ^{[1
]}

Saito, S. ^{[2
]}

Kakuyanagi, K. ^{[2
]}

Tanaka, H. ^{[2
]}

Meno, T. ^{[3
]}

Semba, K. ^{[2
]}

Takayanagi, H. ^{[4
,5
]}

Solano, E. ^{[6
,7
,8
]}

Gross, R. ^{[1
]}

机构：

[1] Bayerische Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany

[2] NTT Corp, NTT Basic Res Labs, Kanagawa 2430198, Japan

[3] NTT Corp, NTT Adv Technol, Kanagawa 2430198, Japan

[4] Tokyo Univ Sci, Shinjuku Ku, Tokyo 1628601, Japan

[5] NIMS, Int Ctr Mat Nanoarchitectron, Tsukuba, Ibaraki 3050003, Japan

[6] Univ Munich, Dept Phys, ASC, D-80333 Munich, Germany

[7] Univ Munich, CeNS, D-80333 Munich, Germany

[8] Univ Basque Country, Euskal Herriko Unibertsitatea, Dept Quim Fis, E-48080 Bilbao, Spain

来源：

NATURE PHYSICS | 2008年 / 4卷 / 09期

关键词：

D O I：

10.1038/nphys1016

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Superconducting qubits(1,2) behave as artificial two-level atoms and are used to investigate fundamental quantum phenomena. In this context, the study of multiphoton excitations(3-7) occupies an important role. Moreover, coupling superconducting qubits to onchip microwave resonators has given rise to the field of circuit quantum electrodynamics(8-15) (QED). In contrast to quantum-optical cavity QED (refs 16-19), circuit QED offers the tunability inherent to solid-state circuits. Here, we report on the observation of key signatures of a two-photon-driven Jaynes-Cummings model, which unveils the upconversion dynamics of a superconducting flux qubit(20) coupled to an on-chip resonator. Our experiment and theoretical analysis show clear evidence for the coexistence of one-and two-photon-driven level anticrossings of the qubit-resonator system. This results from the controlled symmetry breaking of the system hamiltonian, causing parity to become a not-well-defined property(21). Our study provides fundamental insight into the interplay of multiphoton processes and symmetries in a qubit-resonator system.

引用

页码：686 / 691

页数：6

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