### Abstract

A neutron-spin experimental test of the quantum Zeno effect (QZE) is discussed from a practical point of view, where the nonideal efficiency of the magnetic mirrors, used for filtering the spin state, is taken into account. In the idealized case, the number N of (ideal) mirrors can be indefinitely increased, yielding an increasingly better QZE. In contrast, in a practical situation with imperfect mirrors, there is an optimal number of mirrors, [Formula Presented] at which the QZE becomes maximum: more frequent measurements would deteriorate the performance. However, a quantitative analysis shows that a good experimental test of the QZE is still feasible. These conclusions are of general validity: in a realistic experiment, the presence of losses and imperfections leads to an optimal frequency [Formula Presented] which is in general finite. One should not increase N beyond [Formula Presented] A convenient formula for [Formula Presented] valid in a broad framework, is derived as a function of the parameters characterizing the experimental setup.

Original language | English |
---|---|

Number of pages | 1 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 68 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2003 Jan 1 |

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### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

*Physical Review A - Atomic, Molecular, and Optical Physics*,

*68*(1). https://doi.org/10.1103/PhysRevA.68.012107

**Optimization of a neutron-spin test of the quantum Zeno effect.** / Facchi, Paolo; Nakaguro, Yoichi; Nakazato, Hiromichi; Pascazio, Saverio; Unoki, Makoto; Yuasa, Kazuya.

Research output: Contribution to journal › Article

*Physical Review A - Atomic, Molecular, and Optical Physics*, vol. 68, no. 1. https://doi.org/10.1103/PhysRevA.68.012107

}

TY - JOUR

T1 - Optimization of a neutron-spin test of the quantum Zeno effect

AU - Facchi, Paolo

AU - Nakaguro, Yoichi

AU - Nakazato, Hiromichi

AU - Pascazio, Saverio

AU - Unoki, Makoto

AU - Yuasa, Kazuya

PY - 2003/1/1

Y1 - 2003/1/1

N2 - A neutron-spin experimental test of the quantum Zeno effect (QZE) is discussed from a practical point of view, where the nonideal efficiency of the magnetic mirrors, used for filtering the spin state, is taken into account. In the idealized case, the number N of (ideal) mirrors can be indefinitely increased, yielding an increasingly better QZE. In contrast, in a practical situation with imperfect mirrors, there is an optimal number of mirrors, [Formula Presented] at which the QZE becomes maximum: more frequent measurements would deteriorate the performance. However, a quantitative analysis shows that a good experimental test of the QZE is still feasible. These conclusions are of general validity: in a realistic experiment, the presence of losses and imperfections leads to an optimal frequency [Formula Presented] which is in general finite. One should not increase N beyond [Formula Presented] A convenient formula for [Formula Presented] valid in a broad framework, is derived as a function of the parameters characterizing the experimental setup.

AB - A neutron-spin experimental test of the quantum Zeno effect (QZE) is discussed from a practical point of view, where the nonideal efficiency of the magnetic mirrors, used for filtering the spin state, is taken into account. In the idealized case, the number N of (ideal) mirrors can be indefinitely increased, yielding an increasingly better QZE. In contrast, in a practical situation with imperfect mirrors, there is an optimal number of mirrors, [Formula Presented] at which the QZE becomes maximum: more frequent measurements would deteriorate the performance. However, a quantitative analysis shows that a good experimental test of the QZE is still feasible. These conclusions are of general validity: in a realistic experiment, the presence of losses and imperfections leads to an optimal frequency [Formula Presented] which is in general finite. One should not increase N beyond [Formula Presented] A convenient formula for [Formula Presented] valid in a broad framework, is derived as a function of the parameters characterizing the experimental setup.

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U2 - 10.1103/PhysRevA.68.012107

DO - 10.1103/PhysRevA.68.012107

M3 - Article

AN - SCOPUS:85037184087

VL - 68

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 1

ER -