Phase shift of a weak coherent beam induced by a single atom
Syed Abdullah Aljunid, Meng Khoon Tey, Brenda Chng, Timothy Liew, Gleb, Maslennikov, Valerio Scarani, and Christian Kurtsiefer
TL;DR
This paper demonstrates the direct measurement of a small phase shift induced by a single atom on a weak coherent beam using an interferometer, highlighting quantum light-matter interaction effects.
Contribution
It provides the first direct measurement of a phase shift caused by a single atom on a weak coherent light beam.
Findings
Maximum phase shift of about 1 degree observed.
Single atom can induce measurable phase shifts in coherent light.
Experimental setup using Mach-Zehnder interferometer successfully detects atomic effects.
Abstract
We report on a direct measurement of a phase shift on a weak coherent beam by a single Rb-87 atom in a Mach-Zehnder interferometer. A maximum phase shift of about 1 degree is observed experimentally.
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