Bell-state generation in circuit QED via Landau-Zener tunneling

Peter Hänggi, Martijn Wubs, Sigmund Kohler, Keiji Saito, Yosuke Kayanuma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A qubit may undergo Landau-Zener transitions due to its coupling to one or several quantum harmonic oscillators. First we show that for a qubit coupled to one oscillator, Landau-Zener transitions can be used for single-photon generation and for the controllable creation of qubit-oscillator entanglement, with state-of-the-art circuit QED as a promising realization. Second, for a qubit coupled to two cavities, we show that Landau-Zener sweeps of the qubit are well suited for the robust creation of entangled cavity states, in particular symmetric Bell states, with the qubit acting as the entanglement mediator. Finally, for a qubit coupled to an environment or bath we propose to employ dissipative Landau-Zener sweeps of the qubit for the detection of bath properties. At the heart of our proposals lies the calculation of the exact Landau-Zener transition probability for the qubit, by summing all orders of the corresponding series in time-dependent perturbation theory.

Original languageEnglish
Title of host publicationNoise and Fluctuations - 19th International Conference on Noise and Fluctuations, ICNF 2007
Pages501-506
Number of pages6
DOIs
Publication statusPublished - 2007
Event19th International Conference on Noise and Fluctuations, ICNF2007 - Tokyo, Japan
Duration: 2007 Sep 92007 Sep 14

Publication series

NameAIP Conference Proceedings
Volume922
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other19th International Conference on Noise and Fluctuations, ICNF2007
CountryJapan
CityTokyo
Period07/9/907/9/14

Keywords

  • driven quantum systems
  • entanglement
  • level crossing
  • quantum dissipation
  • quantum information
  • quantum noise

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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