Dark Bell states in tunnel-coupled spin qubits
  We investigate the dynamical purification of maximally entangled electron states by transport through coupled quantum dots. Under resonant ac driving and coherent tunneling, even-parity Bell states perform Rabi oscillations that decouple from the environment, leading to a dark state. The two electrons remain spatially separated, one in each quantum dot. We propose configurations where this effect will prove as antiresonances in transport spectroscopy experiments. 
Rafael S\'anchez, Gloria Platero
cond-mat.mes-hall quant-ph