Sami Mitra at APS Physics writes: ''Whether quantum dots will prove to be reliable building blocks for a quantum computer will depend on how well we measure and control their charge and spin. Spin qubits in quantum dots—wherein a spin-1/2 electron encodes the two bits of information—would be particularly useful if they were fine-tuned to an applied magnetic field.'' See also [http://link.aps.org/abstract/PRL/v105/e116801 the paper published in PRL] ([http://arxiv.org/abs/1002.3771 ArXiv preprint]).