Relaxation and dephasing
Quantum information decays through energy loss and phase randomization.
$$\frac1{T_2}=\frac1{2T_1}+\frac1{T_\varphi}$$
Physical intuition
Quantum information decays through energy loss and phase randomization.
Deep dive: physical mechanism
T1 measures population relaxation; pure dephasing contributes additional coherence loss.
What is measured experimentally?
Inversion recovery, Ramsey and Hahn echo extract time constants.
Assumptions, noise and limitations
The equality assumes standard Markovian exponential-decay definitions.
Research and simulation exercise
Fit synthetic relaxation and Ramsey traces.
Connect the ideas
Explore the chapter overview, learning path, and references.