Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 37: Quantum Coherence, Quantum Information Systems 1

TT 37.8: Talk

Wednesday, March 13, 2013, 11:30–11:45, H19

Dissipatively driven Entanglement of two Nuclear Spin Ensembles in a Double Quantum Dot — •Martin J. A. Schuetz, Eric M. Kessler, Juan Ignacio Cirac, and Geza Giedke — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany

Typically, quantum information schemes have been discussed in the context of isolated many-body systems subject to unitary dynamics. Here, dissipation has been identified as a mechanism that corrupts the useful quantum properties of the system under study. Recently, however, with the advent of novel ideas such as dissipative engineering, a paradigm shift could be observed in quantum physics. More and more approaches actively utilize dissipation as a driving force behind the emergence of coherent quantum phenomena. In this spirit, we propose a transport scheme for an electrically defined double quantum dot in which the two nuclear ensembles in the host environment are actively pumped into an entangled target state. Based on a self-consistent Holstein-Primakoff approximation, we derive an effective quantum master equation for the nuclear spins which features an unique entangled steady state; accordingly, long lasting entanglement is created deterministically. Prospects for the experimental realization of this proposal are briefly discussed.