Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Quantum Dots, Quantum Wires, Point Contacts

TT 46.12: Vortrag

Mittwoch, 3. April 2019, 18:00–18:15, H22

Coherent long-range transfer of two-electron states in ac driven triple quantum dots — •Jordi Picó-Cortés1,2, Fernando Gallego-Marcos2, and Gloria Platero21Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2Instituto de Ciencia de Materiales de Madrid (CSIC), E-28049, Madrid, Spain

Since the proposal by Cirac and Zoller to use photons for quantum state transfer between atoms located at spatially-separated nodes of a quantum network [1], different works have explored how to transfer quantum states. In our work [2] we propose a protocol to prepare a state in the left and center quantum dots of a triple dot array and transfer it directly to the center and right dots. Initially the state in the left and center dots is prepared combining the exchange interaction and magnetic field gradients. Once in the desired state, ac gate voltages in the outer dots are switched on, allowing to select a given photoassisted long-range path and to transfer the prepared state directly from one edge to the other with high fidelity. We investigate the effect of charge noise on the protocol and propose a configuration in which the transfer can be performed with high fidelity. Our proposal can be experimentally implemented and is a promising avenue for transferring quantum states between two spatially separated two-level systems.
J. I. Cirac, P. Zoller, H. J. Kimble, H. Mabuchi, Phys. Rev. Lett. 78, 3221 (1997)
J. Picó-Cortés, F. Gallego-Marcos, G. Platero, arXiv:1810.06517 (2018)

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