PhD in Molecular Qudits

Karlsruhe Institute of Technology

The molecular spin-transistor is one approach to access the spin degree of freedom of a single molecule magnet (SMM) to store information in the nuclear spin of a central magnetic atom, typically from the lanthanide (Ln) series. Therefore, a SMM is trapped inside a nanometer sized gap between two gold electrodes at millikelvin temperatures of a Sionludi dilution refrigerator. In this three-terminal device, the discrete energy levels of the molecule form a quantum readout dot, which is dominated by single-electron tunneling and sensitive to the molecule’s spin. A quantum non-demolishing readout of the stored information can be established using the hyperfine interaction between both molecular spins – nuclear and electronic – in the so-called spin-cascade. Experimentally, this is implemented by sweeping magnetic fields of up to one Tesla with superconducting 3D-vector magnets and low-noise electrical conductivity measurements. Efficient coupling of microwaves at this low temperature environment rounds off the experimental challenges and allows for the implementation of quantum information processing algorithms of such Qudits. The term Qudits refers to higher spin systems utilizing more states than conventional Qubits, where chemical engineering of intramolecular interactions can be used to further increase the accessible Hilbert space.

How to apply

If you are interested, please write an email to professor Wolfgang Wernsdorfer.

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Published on March 18, 2023

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