▁tra pped ▁electrons ) ▁Quant um ▁dot ▁computer , ▁spatial - based ▁( qu bit ▁given ▁by ▁electron ▁position ▁in ▁double ▁quantum ▁dot ) ▁Cou ple d ▁Quant um ▁W ire ▁( qu bit ▁implemented ▁by ▁a ▁pair ▁of ▁Quant um ▁W ires ▁couple d ▁by ▁a ▁Quant um ▁Point ▁Contact ) ▁N uc lear ▁magnetic ▁reson ance ▁quantum ▁computer ▁( N MR Q C ) ▁implemented ▁with ▁the ▁nuclear ▁magnetic ▁reson ance ▁of ▁mole cules ▁in ▁solution , ▁where ▁qu bits ▁are ▁provided ▁by ▁nuclear ▁sp ins ▁within ▁the ▁dissol ved ▁mole c ule ▁and ▁prob ed ▁with ▁radio ▁waves ▁Sol id - state ▁N MR ▁K ane ▁quantum ▁computers ▁( qu bit ▁realized ▁by ▁the ▁nuclear ▁spin ▁state ▁of ▁ph osph orus ▁don ors ▁in ▁sil icon ) ▁Elect rons - on - hel ium ▁quantum ▁computers ▁( qu bit ▁is ▁the ▁electron ▁spin ) ▁Cav ity ▁quantum ▁elect rod ynam ics ▁( C Q ED ) ▁( qu bit ▁provided ▁by ▁the ▁internal ▁state ▁of ▁tra pped ▁atoms ▁couple d ▁to ▁high - f ines se ▁cav ities ) ▁M ole cular ▁magnet ▁( qu bit ▁given ▁by ▁spin ▁states ) ▁Full er ene - based ▁E SR ▁quantum ▁computer ▁( qu bit ▁based ▁on ▁the ▁electronic ▁spin ▁of ▁atoms ▁or ▁mole cules ▁enc ased ▁in ▁full eren es ) ▁Linear ▁optical ▁quantum ▁computer ▁( qu bits ▁realized ▁by ▁processing ▁states ▁of ▁different ▁modes ▁of ▁light ▁through ▁linear ▁elements ▁e . g . ▁mirror s , ▁beam ▁split ters ▁and