Systematic construction of topological-nontopological hybrid universal quantum gates based on many-body Majorana fermion interactions

Abstract

Topological quantum computation by way of braiding of Majorana fermions is not universal quantum computation. There are several attempts to make universal quantum computation by introducing some additional quantum gates or quantum states. However, there is an embedding problem that $M$-qubit gates cannot be embedded straightforwardly in $N$ qubits for $N>M$. This problem is inherent to the Majorana system, where logical qubits are different from physical qubits because braiding operations preserve the fermion parity. By introducing $2N$-body interactions of Majorana fermions, topological-nontopological hybrid universal quantum computation is shown to be possible. Especially, we make a systematic construction of the C${}^n$Z gate, C${}^n$NOT gate and the C${}^n$SWAP gate.

arXiv comment26 pages, 6 figures

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