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Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime

Year: 2010

Type: article

Abstract: We measure the dispersive energy-level shift of an LC resonator magnetically coupled to a superconducting qubit, which clearly shows that our system operates in the ultrastrong coupling regime. The large mutual kinetic inductance provides a coupling energy of ≈ 0.82 GHz, requiring the addition of counter-rotating-wave terms in the description of the Jaynes-Cummings model. We find a 50 MHz Bloch-Siegert shift when the qubit is in its symmetry point, fully consistent with our analytical model.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.105.237001

Authors: P. Forn-Díaz, J. Lisenfeld, D. Marcos, J. J. García-Ripoll, E. Solano, C. J. P. M. Harmans, J. E. Mooij

Institutions: Delft University of Technology, Karlsruhe Institute of Technology, Consejo Superior de Investigaciones Científicas, Instituto de Ciencia de Materiales de Madrid, Instituto de Física Fundamental, Ikerbasque, University of the Basque Country

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Ministerio de Ciencia e Innovación

OpenAlex ID: W2130074705

FWCI: 38.86

Cites: 28

Cited by: 732

Related to: 10