Determining the electronic triplet-singlet transition probability in double quantum dots: Analogy with the double slit experiment

摘要

We apply an elementary measurement scheme to calculate the electronictriplet-singlet transition mediated by hyperfine interaction in a doublequantum dot. We show how the local character of the hyperfine interaction andthe nuclear back-action process (flip-flop) are crucial to cancel destructiveinterferences of the triplet-singlet transition probability. It is preciselythis cancellation which differentiates the hyperfine interaction from ananisotropic magnetic field which mixes the triplet and the singlet eigenstates.