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Regular version of the site

Article

Disentangled Quantum Operation on Majorana Qubits in Qubit Chains

Journal of Experimental and Theoretical Physics. 2019. Vol. 129. No. 4. P. 733-737.
Makhlin Y., Backens S., Shnirman A.

We consider quantum logical gates on Majorana qubits implemented in chain structures of ordinary qubits, spins, or pseudospins. We demonstrate that one can implement a two-qubit operation via local manipulations, using an extra coupler spin in a T-junction geometry, so that this coupler spin remains disentangled from the qubit. Furthermore, we identify a set of symmetry operations, which not only allow us to determine the resulting two-qubit gate, but also to demonstrate robustness of the resulting gate to inaccuracies in the manipulations, known for topological quantum computation.