Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 18: Biomolecules and Electron Transfer

MO 18.4: Vortrag

Freitag, 10. März 2017, 11:45–12:00, N 25

Quantum reaction control for quantum-limited biochemical magnetometers — •Kyriacos Vitalis and Iannis Kominis — University of Crete, Department of Physics, Heraklion 71003 Greece

Radical-ion-pair reactions have triggered the study of quantum effects in biological systems. Here we address radical-pair reactions from the perspective of quantum metrology. Since the coherent spin motion of radical-pairs is effected by an external magnetic field, these spin-dependent reactions essentially realize a biochemical magnetometer. Using the quantum Fisher information, we find the fundamental quantum limits to the magnetic sensitivity of radical-pair magnetometers. We then find that the usual measurement scheme of reaction yields approaches the fundamental limits to within an order of magnitude. Finally, we demonstrate that with a realistic quantum reaction control reminding of Ramsey interferometry, here presented as a quantum circuit involving the spin-exchange interaction and a recently proposed molecular switch, we can approach the fundamental quantum limit within a factor of 2. This work opens the application of well-advanced quantum metrology methods to biological systems.