Home > Research > Publications & Outputs > Quantum noise and mode nonorthogonality in nonh...

Electronic data

  • PhysRevA

    Rights statement: ©2011 American Physical Society

    Final published version, 800 KB, PDF document


Text available via DOI:

View graph of relations

Quantum noise and mode nonorthogonality in nonhermitian PT-symmetric optical resonators

Research output: Contribution to journalJournal articlepeer-review

Article number063833
<mark>Journal publication date</mark>11/12/2011
<mark>Journal</mark>Physical review a
Issue number6
Number of pages0
Publication StatusPublished
<mark>Original language</mark>English


PT-symmetric optical resonators combine absorbing regions with active, amplifying regions. The latter are the source of radiation generated via spontaneous and stimulated emission, which embodies quantum noise and can result in lasing. We calculate the frequency-resolved output radiation intensity of such systems and relate it to a suitable measure of excess noise and mode nonorthogonality. The line shape differs depending on whether the emission lines are isolated (as for weakly amplifying, almost-Hermitian systems) or overlapping (as for the almost-degenerate resonances in the vicinity of exceptional points associated with spontaneous PT-symmetry breaking). The calculations are carried out in the scattering input-output formalism, and are illustrated for a quasi-one-dimensional resonator setup. In our derivations, we also consider the more general case of a resonator in which the amplifying and absorbing regions are not related by symmetry.

Bibliographic note

©2011 American Physical Society