SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 9: Quantum Dynamics, Decoherence and Quantum Information

DY 9.6: Vortrag

Montag, 27. März 2023, 15:15–15:30, MOL 213

Quantum Zeno manipulation of quantum dotsNaser Ahmadiniaz1, Martin Paul Geller2, Jürgen König2, Peter Kratzer2, Axel Lorke2, •Gernot Schaller1, and Ralf Schützhold1,31Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany — 3Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

We investigate whether and how the quantum Zeno effect, i.e., the inhibition of quantum evolution by frequent measurements, can be employed to isolate a quantum dot from its surrounding electron reservoir. In contrast to the often studied case of tunneling between discrete levels, we consider the tunneling of an electron from a continuum reservoir to a discrete level in the dot. Realizing the quantum Zeno effect in this scenario can be much harder because the measurements should be repeated before the wave packet of the hole left behind in the reservoir moves away from the vicinity of the dot. Thus the required repetition rate could be lowered by having a flat band (with a slow group velocity) in resonance with the dot or a sufficiently small Fermi velocity or a strong external magnetic field. We also consider the anti-Zeno effect, i.e., how measurements can accelerate or enable quantum evolution.
[1] N. Ahmadiniaz et al., Phys. Rev. Res. 4, L032045 (2022).

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