Dark Bell states in tunnel-coupled spin qubits
arXiv:1210.1595 · doi:10.1103/PhysRevB.87.081305
Abstract
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.
5 pages, 4 figures + supplementary information. Published version
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