Secure multiparty quantum computation protocol for quantum circuits: The exploitation of triply even quantum error-correcting codes

Secure multiparty quantum computation (MPQC) protocol is a cryptographic primitive allowing error-free distributed quantum computation to a group of n mutually distrustful quantum nodes even when some quantum nodes disobey the instructions of the protocol. Here we suggest a modified MPQC protocol that adopts unconventional quantum error-correcting codes and as a consequence reduces the number of qubits required for the protocol execution. In particular, the replacement of the self-dual Calderbank-Shor-Steane quantum error-correcting codes with triply even ones permits us to avoid the previously indispensable but resource-intensive procedure of the ``magic-state'' verification. Besides, since every extra qubit reduces the credibility of physical devices, our suggestion makes the MPQC protocol more accessible for the near-future technology by reducing the number of necessary qubits per quantum node from n²+Θ(r)n, where r is the security parameter, to n²+3n.