Quantum galvanometer by interfacing a vibrating nanowire and cold atoms

O. Kálmán, T. Kiss, J. Fortágh, P. Domokos

Research output: Contribution to journalArticle

15 Citations (Scopus)


We evaluate the coupling of a Bose-Einstein condensate (BEC) of ultracold, paramagnetic atoms to the magnetic field of the current in a mechanically vibrating carbon nanotube within the frame of a full quantum theory. We find that the interaction is strong enough to sense quantum features of the nanowire current noise spectrum by means of hyperfine-state-selective atom counting. Such a nondestructive measurement of the electric current via its magnetic field corresponds to the classical galvanometer scheme, extended to the quantum regime of charge transport. The calculated high sensitivity of the interaction in the nanowire-BEC hybrid systems opens up the possibility of quantum control, which may be further extended to include other relevant degrees of freedom.

Original languageEnglish
Pages (from-to)435-439
Number of pages5
JournalNano Letters
Issue number1
Publication statusPublished - Jan 11 2012


  • Bose-Einstein condensates
  • Carbon nanotubes
  • cold atoms
  • nanowires
  • quantum noise
  • quantum sensors

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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