Charge qubits and double quantum dots
An electron can occupy a coherent superposition of two dots.
$$H_c=\frac{\epsilon}{2}\tau_z+t_c\tau_x$$
Physical intuition
An electron can occupy a coherent superposition of two dots.
Deep dive: physical mechanism
Detuning controls the energy bias and tunneling mixes left and right charge states.
What is measured experimentally?
Microwave spectroscopy resolves bonding–antibonding splitting.
Assumptions, noise and limitations
Charge qubits are typically sensitive to electric noise.
Research and simulation exercise
Plot the charge-qubit energy gap versus detuning.
Connect the ideas
Explore the chapter overview, learning path, and references.