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Parity-dependent photon-subtracted two-mode squeezed vacuum states

Ananga Mohan Datta1,2, Andrea Blanco-Redondo3, Kurt Busch1,4, and Armando Perez-Leija5

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Phys. Rev. A 112, 023701 – Published 1 August, 2025

DOI: https://doi.org/10.1103/4x83-y4bg

Abstract

The removal of photons from certain quantum light sources produces so-called photon-subtracted states with enhanced mean photon numbers and intricate quantum correlations. Here, we propose an integrated photon-subtraction scheme that, contrary to previous approaches, is not heralded by photon correlation (coincidence) measurements. In this way, our technique exploits the “Welcher Weg” (“which way”) information problem, as it does not provide information about the modes from which the subtracted photons emanated. We show that this lack of information allows the generation of multiphoton states endowed with rich quantum correlations that strongly depend on the parity, evenness or oddness, of the number of subtracted photons.

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Phys. Rev. A 112, 023701– Published 1 August, 2025
  • Received 4 February 2025
  • Accepted 8 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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