首页|Preparation of entangled W states based on the cavity QED system
Preparation of entangled W states based on the cavity QED system
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We present a qubit-loss-free(QLF)fusion scheme for generating large-scale atom W states in cavity quantum elec-trodynamics(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|W>n+m+t states can be generated from the|W>n,|W>m,and|W>t states with the help of two auxiliary atoms,and three|W>n+m+t+q states can be generated from|W>n,|W>m,|W>t,and a|W>qstate 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.
W statedetuned interactionstate fusioncavity quantum electrodynamics
李可、赵军龙
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Department of Physics,Shanghai Second Polytechnic University,Shanghai 201209,China
Quantum Information Research Center Shangrao Normal University,Shangrao 334001,China
National Natural Science Foundation of ChinaJiangxi Natural Science Foundation
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