Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Quantum Coherence and Quantum Information Systems II
TT 7.8: Vortrag
Montag, 26. März 2007, 15:45–16:00, H20
Spin qubits with electrically gated polyoxometalates — •Jörg Lehmann1, Alejandro Gaita-Ariño2, Eugenio Coronado2, and Daniel Loss1 — 1Departement für Physik und Astronomie, Universität Basel, Schweiz — 2Institute of Molecular Science, Universitat de Valencia, Spain
We present a scheme for the implementation of a fundamental quantum gate, the so-called square-root-of-swap operation, in electrically gated polyoxometalates. The specific molecules we consider comprise three parts: two localized spins 1/2 forming the qubits and a central core, which couples the two spins via an indirect exchange mechanism. By charging and decharging the central core the exchange interaction between the two qubits can be controlled and the square-root-of-swap gate can be realized. Based on a Bloch-Redfield description of the charging dynamics of the molecule coupled to metallic leads we calculate the gate fidelity. Using parameters obtained from an ab-initio description of the molecule, we show that fidelities of up to 99% can be achieved.