CPT

1
CPT EIT LWI
2
1gt
3gt
2gt
3
CPT
Population Trapping
Suppose
then
solving Schrodinger Equation
What if were sneaky and choose Such that
c1(t)0. Then we are trapped in the two lower
states.
4
CPT
Dark States
In fact
So
Is an eigenstate of the interaction Hamiltonian
5
CPT
Coherent Population
Incoherent mixture density matrix at t0
Dark State density matrix at t0
Rabi Oscillations
Trapped in dark state
6
EIT
1gt
strong
weak
3gt
2gt
7
EIT
Imn
Ren-1
8
EIT
quant-ph/0204173
9
LWI
We can completely eliminate absorption, can we do
better?
The idea Pump atoms into dark state, then
emission from 1gt can exceed absorption from
ground states.
1gt
3gt
2gt
10
BIB
Quantum Optics, Scully and Zubairy,Cambridge
University press 1997
Resolving conundrums in lasing without inversion
via exact solutions to simple models, Scully,
Quantum Opt. 6 p 203, 1994
Slow, Ultraslow, stored, and Frozen Light,
Matsko,et. al., Adv.Atm.Mol.Opt.Phys. 47, p191
2001
Electromagnetically Induced Transparency, Harris,
Physics Today, July 1997, p36