Double detected spin-dependent quantum dot |
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Authors: | József Zsolt Bernád |
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Institution: | 1. Institut für Angewandte Physik, Technische Universität Darmstadt D-64289, Germany;2. Institute of Fundamental Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand |
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Abstract: | We study the dynamics of a spin-dependent quantum dot system, where an unsharp and a sharp detection scenario is introduced. The back-action of the unsharp detection related to the magnetization, proposed in terms of the continuous quantum measurement theory, is observed via the von Neumann measurement (sharp detection) of the electric charge current. The behavior of the average electron charge current is studied as a function of the unsharp detection strength γ, and features of measurement back-action are discussed. The achieved equations reproduce the quantum Zeno effect. Considering magnetic leads, we demonstrate that the measurement process may freeze the system in its initial state. We show that the continuous observation may enhance the transition between spin states, in contradiction with rapidly repeated projective observations, when it slows down. Experimental issue, such as the accuracy of the electric current measurement, is analyzed. |
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Keywords: | Quantum measurement theory Quantum dot Quantum Zeno effect Heisenberg uncertainty principle |
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