1201.5734 (Zheng-Yuan Xue)

Quantum computation in a quantum-dot-Majorana-fermion hybrid system    [PDF]

Zheng-Yuan Xue

We propose a scheme to implement universal quantum computation in a
quantum-dot-Majorana-fermion hybrid system. Quantum information is encoded on
pairs of Majorana fermions, which live on the the interface between
topologically trivial and nontrivial sections of a quantum nanowire deposited
on an s-wave superconductor. Universal single-qubit gates on topological qubit
can be achieved. A measurement-based two-qubit Controlled-Not gate is produced
with the help of parity measurements assisted by the quantum-dot and followed
by prescribed single-qubit gates. The parity measurement, on the quantum-dot
and a topological qubit, is achieved by the Aharonov- Casher effect.

View original: http://arxiv.org/abs/1201.5734