Tuning Wave-Particle Duality of Quantum Light by Generalized Photon Subtraction

• URL: http://arxiv.org/abs/2602.21629v1
• Date: Wed, 25 Feb 2026 06:47:39 GMT
• Title: Tuning Wave-Particle Duality of Quantum Light by Generalized Photon Subtraction
• Authors: Kan Takase, Mamoru Endo, Fumiya Hanamura, Kazuki Hirota, Masahiro Yabuno, Hirotaka Terai, Shigehito Miki, Takahiro Kashiwazaki, Asuka Inoue, Takeshi Umeki, Petr Marek, Radim Filip, Warit Asavanant, Akira Furusawa,
• Abstract summary: In bosonic systems there exists a continuum of intermediate states bridging wave-like Schrdinger cat states and particle-like Fock states.<n>Here we experimentally demonstrate generation of these intermediate states by employing generalized photon subtraction (GPS)<n>This approach allows us to construct a spectral family of quantum states with high generation rates, optimized according to the required fault-tolerance threshold.
• Score: 0.18936012617655987
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Wave--particle duality is a hallmark of quantum mechanics. For bosonic systems, there exists a continuum of intermediate states bridging wave-like Schrödinger cat states and particle-like Fock states. Such states have recently been recognized as valuable resources for enhancing fault-tolerant quantum computation (FTQC) with propagating light. Here we experimentally demonstrate tunable generation of these intermediate states by employing generalized photon subtraction (GPS). By detecting up to three photons from squeezed-light sources with a photon-number-resolving detector, we continuously control the balance between wave- and particle-like features. This approach allows us to construct a spectral family of quantum states with high generation rates, optimized according to the required fault-tolerance threshold. Our results establish GPS as a versatile toolbox for tailoring non-Gaussian resources, opening a pathway to efficient Gottesman--Kitaev--Preskill (GKP) qubit generation and addressing a central bottleneck in optical quantum computing.

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