The Janus State: Strong Photon Antibunching from a Superposition of Squeezed Vacua

• URL: http://arxiv.org/abs/2506.06397v2
• Date: Fri, 27 Jun 2025 13:25:42 GMT
• Title: The Janus State: Strong Photon Antibunching from a Superposition of Squeezed Vacua
• Authors: Arash Azizi,
• Abstract summary: We introduce the Janus State -- a superposition of two squeezed vacuum states.<n>Our exact analytical theory reveals this emergent nonclassicality is driven by pure quantum interference.<n>This result fundamentally challenges the paradigm that antibunching requires non-Gaussian resources.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Fundamental principles of quantum mechanics, such as superposition, have long been used to create nonclassical ``cat states'' from classical-like components. We push this concept into the fully quantum regime by introducing the Janus State -- a superposition of two squeezed vacuum states. Here, we report the discovery that this state, born from two photon-bunched components, exhibits strong photon antibunching. Our exact analytical theory reveals this emergent nonclassicality is driven by pure quantum interference, which suppresses two-photon events and drives the second-order coherence to $g^{(2)}(0) \approx 0.567$. This result fundamentally challenges the paradigm that antibunching requires non-Gaussian resources or post-selection. The Janus State thus constitutes a new foundational tool for quantum engineering, providing a deterministic and experimentally accessible route to generating highly nonclassical light.

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