####################
  Three-level
####################

***************************************
Λ Configuration: EIT, CPT & Adiabatons
***************************************

A probe field on one transition and a coupling field on the other create a
dark state decoupled from the excited level. Phenomena include slow light,
electromagnetically induced transparency (EIT), coherent population
trapping (CPT), light storage and retrieval, and adiabatic population
transfer (adiabatons).

.. toctree::
   :maxdepth: 1

   mbs-lambda-weak-pulse-more-atoms-no-coupling
   mbs-lambda-weak-pulse-more-atoms-with-coupling
   mbs-lambda-weak-pulse-cloud-atoms-with-coupling
   mbs-lambda-weak-pulse-cloud-atoms-with-coupling-store
   mbs-lambda-cpt
   mbs-lambda-adiabatons

*******************************************
V Configuration: Matched Pulses & Simultons
*******************************************

Two fields share the same excited state. When the combined pulse areas
satisfy the V-system area theorem, the fields lock together into
shape-preserving **simulton** solutions that propagate without loss.

.. toctree::
   :maxdepth: 1

   mbs-vee-sech-0.5pi-0.5pi
   mbs-vee-sech-0.5pi-1.5pi
   mbs-vee-sech-sqrt2pi-sqrt2pi
   mbs-vee-sech-sqrt8pi-sqrt8pi
   mbs-vee-sech-sqrt18pi-sqrt18pi
   mbs-vee-sech-sqrt8pi-sqrt8pi-collision
   mbs-vee-weak-cw-sech-2pi
   mbs-vee-weak-cw-sech-4pi

*******************************************************
Ladder (Ξ) Configuration: EIT, Autler-Townes & Rydberg
*******************************************************

A probe drives the lower transition and a coupling field drives the upper
transition, creating two-photon coherence between ground and top state.
Phenomena include EIT, Autler-Townes dressed-state splitting, and
Doppler-narrowed Rydberg EIT in thermal vapour.

.. toctree::
   :maxdepth: 1

   mbs-ladder-weak-pulse-coupling-decay
   mbs-ladder-autler-townes