Quantum Zeno Manipulation of Quantum Dots

Abstract

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 tunnelling 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.

5 pg + 7 pg supplement, 1+1 figures, to appear in Phys. Rev. Res. Lett

References in corpus (5)

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• Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
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Cited by in corpus (5)

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• Finite-time performance of a cyclic 2d quantum Ising heat engine
• Coupling-energy driven pumping through quantum dots: Role of coherences
• Extending Qubit Coherence Time via Hybrid Dynamical Decoupling