2015/02/18 by Roderick Vance, Vance, Roderick
Mathematics · Physics and Astronomy · #22E15 #22E70 #FOS: Physical sciences #Mathematical Physics (math-ph) #Quantum Physics (quant-ph) #math-ph #math.MP #msc:22E15 #msc:22E70 #quant-ph
paper · pdf · doi:10.48550/arxiv.1502.05200
arxiv created 2015/02/18 · arxiv updated 2015/02/19
By building on the work in Kuzmak & Tkachuk, "Preparation of quantum states of two spin-(1)/(2) particles in the form of the Schmidt decomposition", Physics Letters A, \bf 378, pp1469-1474, which outlined the control of the degree of entanglement within this system, it is proven that any SU(4) state manipulation operator can be realised for this system using a sequence of pulsed magnetic fields in either two linearly independent directions if the gyromagnetic ratios are unequal or three directions for equal gyromagnetic ratios. To achieve this goal, an elementary Lie theoretic proof of the fact that the group of transformations generated by finite products of exponentials of a set of Lie algebra vectors is equal to the Lie group generated by the smallest Lie algebra containing those vectors is rewritten into an explicit algorithm. A numerical example as well as the proof of the algorithm's effectiveness is given.