Enhanced Whispering Gallery Mode Phase Shift using Indistinguishable Photon Pairs

• URL: http://arxiv.org/abs/2404.17409v1
• Date: Fri, 26 Apr 2024 13:38:18 GMT
• Title: Enhanced Whispering Gallery Mode Phase Shift using Indistinguishable Photon Pairs
• Authors: Callum Jones, Antonio Vidiella-Barranco, Jolly Xavier, Frank Vollmer,
• Abstract summary: We show a bimodal coincidence transmission spectrum when the input state is an indistinguishable photon pair. This is due to the doubled WGM phase shift experienced by the path-entangled state in the interferometer. At least a four-fold improvement in the signal-to-noise ratio is possible, with clear implications for quantum-enhanced WGM sensing.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a theoretical investigation of a whispering gallery mode (WGM) resonator coupled to a Mach-Zehnder interferometer (MZI) and show a bimodal coincidence transmission spectrum when the input state is an indistinguishable photon pair. This is due to the doubled WGM phase shift experienced by the path-entangled state in the interferometer. Further, we model the noise in a WGM resonance shift measurement comparing photon pairs with a coherent state. At least a four-fold improvement in the signal-to-noise ratio (SNR) is possible, with clear implications for quantum-enhanced WGM sensing.

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