Pre- and post-selected spin measurements under one internal degree of freedom induced decoherence

Authors

Joshua Bloodymier Salvino ⋅ PH Department of Physical Sciences, Polytechnic University of the Philippines
Ron Gabrielle Llamera ⋅ PH Department of Physical Sciences, Polytechnic University of the Philippines
John Paul Besagas ⋅ PH Department of Physical Sciences, Polytechnic University of the Philippines

Abstract

We investigate the quantum measurement dynamics of a spin-1/2 particle using Galapon's measurement model, focusing on the spin-z component. The particle interacts with a probe and pointer, both initialized in Gaussian wave packets. By varying the interaction time, we observe a transition from weak to strong measurement regimes. In the weak limit, our results reproduce Aharonov's anomalous weak values; in the strong limit, outcomes converge to the spin-z eigenvalues. This study highlights the transition of expectation values from weak to strong measurements within Galapon's framework.

Issue

2025: Proceedings of the 43rd Samahang Pisika ng Pilipinas Physics Conference

Entangled!
25-28 June 2025, National Institute of Physics, University of the Philippines Diliman

Please visit the SPP2025 activity webpage for more information on this year's Physics Congress.

Article ID

SPP-2025-PB-35

Section

Poster Session PB (Theoretical Physics, High Energy Physics, Astrophysics)

Published

2025-06-19

How to Cite

[1]

JB Salvino, RG Llamera, and JP Besagas, Pre- and post-selected spin measurements under one internal degree of freedom induced decoherence, Proceedings of the Samahang Pisika ng Pilipinas 43, SPP-2025-PB-35 (2025). URL: https://proceedings.spp-online.org/article/view/SPP-2025-PB-35.