Quantum Beats - Calculation Based On Quantum Electrodynamics

Calculation Based On Quantum Electrodynamics

For quantum electrodynamical calculation, we should introduce the creation and annihilation operators from second quantization of quantum mechanics.

Let

is a creation operator and
is an annihilation operator.

Then the beat note becomes

for V-type and
for -type,

when the state vector for each type is

and
.

The beat note term becomes

for V-type and
for -type.

By orthogonality of eigenstates, however and .

Therefore, there is a beat note term for V-type atoms, but not for -type atoms.

Read more about this topic:  Quantum Beats

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