Original title: Quantum-Enhanced Phase Estimation with Photon-Added Even and Odd Coherent States in an SU(1,1) Interferometer
Abdelmajid El Maaroufi, Mouad Ait Maskour, Bouchra Maroufi, Mohammed Daoud +1 · September 2026
Measuring tiny shifts in waves, called phase estimation, usually hits a standard precision barrier. Researchers tested a way to beat this limit using a specialized wave-mixing device called an SU(1,1) interferometerA device for measuring phase shifts with amplified light signals.. They sent in custom nonclassical light beams known as photon-added even and odd coherent states. By intentionally adding light particles, called photons, to these states, they tracked how measurement accuracy changed using intensity detection. Adding photons boosted sensitivity well beyond the usual standard quantum limitThe best precision achievable with classical light techniques.. In fact, as the researchers added more photons, the sensitivity steadily pushed toward the best possible benchmark, known as Heisenberg scaling. Adding photons also smoothed out differences between even and odd inputs, showing that the starting state matters less as more photons join in.
Imagine you're in a busy cafeteria trying to hear a friend's quiet voice from across the room. The chatter of everyone else drowns out the sound, so you strain to catch words. In this paper, the interferometer is like your ear trying to listen for a specific sound, and adding photons to the light is like using a directional microphone that focuses on your friend's voice and ignores the background noise. This makes the measurement of the phase shift much more precise, allowing you to detect smaller changes.
This could improve sensors that measure tiny changes in light, affecting fields like navigation and medical imaging. Better precision means more accurate data without costly upgrades.
The abstract doesn't specify if this theoretical improvement is validated experimentally or if it accounts for real-world noise and imperfections in practical systems.
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Quantum-Enhanced Phase Estimation with Photon-Added Even and Odd Coherent States in an SU(1,1) Interferometer — Abdelmajid El Maaroufi, Mouad Ait Maskour, Bouchra Maroufi et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.