5. Quantum Hardware

Spinqubits — Quiz

Test your understanding of spinqubits with 5 practice questions.

Practice Questions

Question 1

Which spin qubit encoding utilizes three electrons in three quantum dots and relies solely on exchange interactions for universal control?

Question 2

What primary issue arises from valley degeneracy in silicon-based spin qubits?

Question 3

For an electron spin qubit with $g=2$ in a magnetic field $B=0.3\,$T, what is the approximate Larmor frequency $f_L$?

Question 4

Given Overhauser field fluctuations of $\Delta B_N=2\,$mT and $g=2$, estimate the inhomogeneous dephasing time $T_2^*$ using $T_2^*\approx\hbar/(g\mu_B\Delta B_N)$.

Question 5

How is the quality factor $Q$ of a spin qubit defined in relation to its coherence time $T_2$ and gate duration $\tau_g$?