Transport Spectroscopy of a Spin-Coherent Dot-Cavity System.

Research paper by C C Rössler, D D Oehri, O O Zilberberg, G G Blatter, M M Karalic, J J Pijnenburg, A A Hofmann, T T Ihn, K K Ensslin, C C Reichl, W W Wegscheider

Indexed on: 10 Nov '15Published on: 10 Nov '15Published in: Physical review letters


Quantum engineering requires controllable artificial systems with quantum coherence exceeding the device size and operation time. This can be achieved with geometrically confined low-dimensional electronic structures embedded within ultraclean materials, with prominent examples being artificial atoms (quantum dots) and quantum corrals (electronic cavities). Combining the two structures, we implement a mesoscopic coupled dot-cavity system in a high-mobility two-dimensional electron gas, and obtain an extended spin-singlet state in the regime of strong dot-cavity coupling. Engineering such extended quantum states presents a viable route for nonlocal spin coupling that is applicable for quantum information processing.