Enhanced quantum sensitivity in a vibrating diatomic molecule due to a rotational amendment

Suranjana Ghosh and Utpal Roy
Phys. Rev. A 90, 022113 – Published 18 August 2014

Abstract

Quantum sensitivity is an important issue in the field of quantum metrology where sub-Planck scale structures play a crucial role in the Heisenberg limited measurement. We investigate the mesoscopic superposition structures, particularly for well-known catlike and compasslike states, in the rotating Morse system where sub-Planck scale structures originate in the dynamics of a suitably constructed SU(2) coherent state. A detail study of the sensitivity analysis reveals that rotational coupling in the vibrational wave packet can be used as a probe to enhance the sensitivity limit in a diatomic molecule. The maximum sensitivity limit is identified with the rotational amendment, and a quantitative measure of the angle of rotation for different rotational levels is also given. The correspondence of the numerical result with the angle of rotation is also delineated in phase-space Wigner representation.

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  • Received 18 August 2013
  • Revised 17 May 2014

DOI:https://doi.org/10.1103/PhysRevA.90.022113

©2014 American Physical Society

Authors & Affiliations

Suranjana Ghosh* and Utpal Roy

  • Indian Institute of Technology Patna, Patliputra Colony, Patna 800013, India

  • *sghosh@iitp.ac.in
  • uroy@iitp.ac.in

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Issue

Vol. 90, Iss. 2 — August 2014

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