Gain-induced group delay in spontaneous parametric down-conversion

• URL: http://arxiv.org/abs/2405.07909v2
• Date: Wed, 06 Nov 2024 15:40:36 GMT
• Title: Gain-induced group delay in spontaneous parametric down-conversion
• Authors: Guillaume Thekkadath, Martin Houde, Duncan England, Philip Bustard, Frédéric Bouchard, Nicolás Quesada, Ben Sussman,
• Abstract summary: We describe and experimentally observe a gain-induced group delay between the multiphoton pulses generated in a high-gain type-II spontaneous parametric down-conversion source. Since the group delay introduces distinguishability between the generated photons, it will be important to compensate for it when designing quantum interference devices.
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• Abstract: Strongly-driven nonlinear optical processes such as spontaneous parametric down-conversion and spontaneous four-wave mixing can produce multiphoton nonclassical beams of light which have applications in quantum information processing and sensing. In contrast to the low-gain regime, new physical effects arise in a high-gain regime due to the interactions between the nonclassical light and the strong pump driving the nonlinear process. Here, we describe and experimentally observe a gain-induced group delay between the multiphoton pulses generated in a high-gain type-II spontaneous parametric down-conversion source. Since the group delay introduces distinguishability between the generated photons, it will be important to compensate for it when designing quantum interference devices in which strong optical nonlinearities are required.

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