Adiabatic Motion of Fault Tolerant Qubits
- Author(s): Drummond, David Edward
- Advisor(s): Pryadko, Leonid P
- et al.
This work proposes and analyzes the adiabatic motion of fault tolerant qubits in two
systems as candidates for the building blocks of a quantum computer. The first proposal
examines a pair of electron spins in double quantum dots, finding that the leading
source of decoherence, hyperfine dephasing, can be suppressed by adiabatic rotation
of the dots in real space. The additional spin-orbit effects introduced by this motion
are analyzed, simulated, and found to result in an infidelity below the error-correction
threshold. The second proposal examines topological qubits formed by Majorana zero
modes theorized to exist at the ends of semiconductor nanowires coupled to conventional
superconductors. A model is developed to design adiabatic movements of the Majorana
bound states to produce entangled qubits. Analysis and simulations indicate that these
adiabatic operations can also be used to demonstrate entanglement experimentally by
testing Bell's theorem.