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arXiv:quant-ph/0603152 · Physical Review A

Electromagnetic manipulation for the anti-Zeno effect in an engineered quantum tunneling process

Lan Zhou, F. M. Hu, Jing Lu, C. P. Sun

Published Sep 11, 2006• 11 citations
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Abstract

We investigate the anti-Zeno phenomenon as well as the quantum Zeno effect for the irreversible quantum tunneling from a quantum dot to a ring array of quantum dots. By modeling the total system with the Anderson-Fano-Lee model, it is found that the transition from the quantum Zeno to the quantum anti-Zeno effect can happen by adjusting magnetic flux and gate voltage.

DOI
10.1103/physreva.74.032102

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We investigate the anti-Zeno phenomenon as well as the quantum Zeno effect for the irreversible quantum tunneling from a quantum dot to a ring array of quantum dots. By modeling the total system with the Anderson-Fano-Lee model, it is found that the transition from the quantum Zeno to the quantum anti-Zeno effect can happen by adjusting magnetic flux and gate voltage.
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As a realization of the quantum Zeno effect, we consider electron tunneling between two quantum dots with one of the dots coupled to a quantum point contact detector. The coupling leads to decoherence and to the suppression of tunneling. When the detector is driven with an ac voltage, a parametric resonance occurs which strongly counteracts decoherence. We propose a novel experiment with which it is possible to observe both the quantum Zeno effect and the parametric resonance in electric transport.
In this Letter, we investigate the occurrence of the Zeno and anti-Zeno effects for quantum Brownian motion. We single out the parameters of both the system and the reservoir governing the crossover between Zeno and anti-Zeno dynamics. We demonstrate that, for high reservoir temperatures, the short time behavior of environment induced decoherence is ultimately responsible for the occurrence of either the Zeno or the anti-Zeno effect. Finally, we suggest a way to manipulate the decay rate of the system and to observe a controlled continuous passage from decay suppression to decay acceleration using engineered reservoirs in the trapped ion context.