Generating nonclassical photon states via longitudinal couplings between superconducting qubits and microwave fields

Yan-Jun Zhao, Yu-Long Liu, Yu-xi Liu, and Franco Nori
Phys. Rev. A 91, 053820 – Published 13 May 2015

Abstract

Besides the conventional transverse couplings between superconducting qubits (SQs) and electromagnetic fields, there are additional longitudinal couplings when the inversion symmetry of the potential energies of the SQs is broken. We study nonclassical-state generation in a SQ which is driven by a classical field and is coupled to a single-mode microwave field. We find that the classical field can induce transitions between two energy levels of the SQs, which either generate or annihilate, in a controllable way, different photon numbers of the cavity field. The effective Hamiltonians of these classical-field-assisted multiphoton processes of the single-mode cavity field are very similar to those for cold ions, confined to a coaxial rf-ion trap and driven by a classical field. We show that arbitrary superpositions of Fock states can be more efficiently generated using these controllable multiphoton transitions, in contrast to the single-photon resonant transition when there is only a SQ-field transverse coupling. The experimental feasibility for different SQs is also discussed.

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  • Received 9 February 2015

DOI:https://doi.org/10.1103/PhysRevA.91.053820

©2015 American Physical Society

Authors & Affiliations

Yan-Jun Zhao1, Yu-Long Liu1, Yu-xi Liu1,2,3,*, and Franco Nori3,4

  • 1Institute of Microelectronics, Tsinghua University, Beijing 100084, China
  • 2Tsinghua National Laboratory for Information Science and Technology, Beijing 100084, China
  • 3CEMS, RIKEN, Saitama 351-0198, Japan
  • 4Physics Department, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA

  • *yuxiliu@mail.tsinghua.edu.cn

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Vol. 91, Iss. 5 — May 2015

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