Eur. Phys. J. D 61, 745-749 (2011)
https://doi.org/10.1140/epjd/e2010-09634-1

Improving the local implementation of a nonlocal multi-party quantum Toffoli gate

Department of Photoelectron and Physics, Foshan University, Foshan, 528000, P.R. China

Corresponding author: ^a chlibing2008@163.com

Received: 21 December 2009
Revised: 19 May 2010
Published online: 10 November 2010

Abstract

Efficient local implementation of a nonlocal multi-party quantum Toffoli gate is considered. We present and demonstrate a scheme that can improve significantly the implementation of this nonlocal (N + 1)-party gate by harnessing N entangled pairs of qubits as quantum channels and a (N+1)-dimensional qudit as a catalyser. The quantum circuit that does the proposed implementation is built entirely of local single-body and two-body gates, and has only (2N + 1) two-body gates. The method that we describe is independent of the particular physical system used to encode quantum information and the way in which the elemental gates are realized.