Coherent Coupling of Alkali Atoms by Random Collisions

Or Katz, Or Peleg, Ofer Firstenberg

Research output: Contribution to journalArticlepeer-review


Random spin-exchange collisions in warm alkali vapor cause rapid decoherence and act to equilibrate the spin state of the atoms in the vapor. In contrast, here we demonstrate experimentally and theoretically a coherent coupling of one alkali species to another species, mediated by these random collisions. We show that the minor species (potassium) inherits the magnetic properties of the dominant species (rubidium), including its lifetime (T1),coherence time (T2), gyromagnetic ratio, and spin-exchange relaxation-free magnetic-field threshold. We further show that this coupling can be completely controlled by varying the strength of the magnetic field. Finally, we explain these phenomena analytically by mode mixing of the two species via spin-exchange collisions.
Original languageEnglish
Article number113003
Number of pages5
JournalPhysical review letters
Issue number11
StatePublished - 9 Sep 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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