▁t unn eling . ▁N im tz ▁told ▁New ▁Scient ist ▁magazine : ▁" For ▁the ▁time ▁being , ▁this ▁is ▁the ▁only ▁viol ation ▁of ▁special ▁relativ ity ▁that ▁I ▁know ▁of ." ▁However , ▁other ▁phys ic ists ▁say ▁that ▁this ▁phenomen on ▁does ▁not ▁allow ▁information ▁to ▁be ▁transm itted ▁faster ▁than ▁light . ▁A e ph ra im ▁Stein berg , ▁a ▁quantum ▁opt ics ▁expert ▁at ▁the ▁University ▁of ▁Toronto , ▁Canada , ▁uses ▁the ▁anal ogy ▁of ▁a ▁train ▁travel ing ▁from ▁Chicago ▁to ▁New ▁York , ▁but ▁dro pping ▁off ▁train ▁cars ▁at ▁each ▁station ▁along ▁the ▁way , ▁so ▁that ▁the ▁center ▁of ▁the ▁train ▁moves ▁forward ▁at ▁each ▁stop ; ▁in ▁this ▁way , ▁the ▁speed ▁of ▁the ▁center ▁of ▁the ▁train ▁exceed s ▁the ▁speed ▁of ▁any ▁of ▁the ▁individual ▁cars . ▁ ▁Sh eng w ang ▁Du ▁claims ▁in ▁a ▁peer - review ed ▁journal ▁to ▁have ▁observed ▁single ▁phot ons ' ▁prec urs ors , ▁saying ▁that ▁they ▁travel ▁no ▁faster ▁than ▁c ▁in ▁a ▁vac u um . ▁His ▁experiment ▁involved ▁slow ▁light ▁as ▁well ▁as ▁passing ▁light ▁through ▁a ▁vac u um . ▁He ▁generated ▁two ▁single ▁phot ons , ▁passing ▁one ▁through ▁rub id ium ▁atoms ▁that ▁had ▁been ▁co o led ▁with ▁a ▁las er ▁( th us ▁slow ing ▁the ▁light ) ▁and ▁passing ▁one ▁through ▁a ▁vac u um . ▁Both ▁times , ▁apparently , ▁the ▁prec urs ors ▁preced ed ▁the ▁phot ons '