摘要
We present a qubit-loss-free(QLF)fusion scheme for generating large-scale atom W states in cavity quantum electrodynamics(QED)system.Compared to the most current fusion schemes which are conditioned on the case where one particle can be extracted from each initial W state to the fusion process,our scheme will access one or two particles from each W state.Based on the atom–cavity-field detuned interaction,three jWin+m+t states can be generated from the jWin,jWim,and jWit states with the help of two auxiliary atoms,and three jWin+m+t+q states can be generated from jWin,jWim,jWit,and a jWiq state with the help of three auxiliary atoms.Comparing the numerical simulations of the resource cost of fusing three small-size W states based on the previous schemes,our fusion scheme seems to be more efficient.This QLF fusion scheme can be generalized to the case of fusing k different or identical particle W states.Furthermore,with no qubit loss,it greatly reduces the number of fusion steps and prepares W states with larger particle numbers.
作者
Ke Li
Jun-Long Zhao
李可;赵军龙(Department of Physics,Shanghai Second Polytechnic University,Shanghai 201209,China;Quantum Information Research Center,Shangrao Normal University,Shangrao 334001,China)
基金
the National Natural Science Foun-dation of China(Grant No.12204311)
the Jiangxi Natural Science Foundation(Grant No.20224BAB211025).
