Beyond the standard quantum Zeno effect
DOI:
https://doi.org/10.33910/2687-153X-2026-7-3-123-130Keywords:
stability, qubit, quantum Zeno effect, minimum, measurement imperfection, stability principleAbstract
In this paper, we introduce a functional for the decoherence rate of a quantum system. The quantum system is modeled as a qubit that can be in the state |1〉, |0〉, or in a superposition. In addition to external dephasing and the Zeno attenuation rate acting on the quantum system, resource losses of the measuring channel are taken into account. It is shown that for the parameters corresponding to the limit of ideally frequent measurements in the quantum Zeno effect, the stability of the qubit state is not increased. The existence of optimal values of the measurement time interval and the measurement imperfection parameter is established; at these values, the decoherence rate of the qubit state reaches a minimum. Calculations show that in the case under consideration, the qubit coherence time increases by a factor of 11.5, which ensures an increase in the stability of the qubit state.
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Copyright (c) 2026 Andrey A. Borisov, Anton A. Borisov, Timur F. Kamalov
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