Attosecond Access to the Quantum Noise of Light
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911594664951808 |
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| author | Zhou, En-Rui Mao, Yi-Jia He, Pei-Lun He, Feng |
| author_facet | Zhou, En-Rui Mao, Yi-Jia He, Pei-Lun He, Feng |
| contents | Characterizing the quantum state of intense light fields on sub-cycle timescales remains beyond the reach of existing methods. Here, we show that attosecond streaking provides direct, phase-sensitive access to the quantum properties of the driving field through delay-resolved photoelectron spectra. Using a Feynman--Vernon treatment, we decompose the influence of the quantized driving field on the photoelectron into coherent and fluctuation contributions. This yields a simple, moment-based characterization of the light state: the first moment of the photoelectron momentum distribution reveals the coherent displacement, while the second central moment captures the fluctuation contribution and, for squeezed states, exhibits a clear modulation at twice the driving frequency, directly signaling phase-sensitive quantum noise. Time-dependent Schrödinger equation simulations confirm these relations and enable retrieval of the coherent phase, the squeezing phase, and the relative strengths of the coherent and fluctuation contributions from delay-resolved spectra. Taken together, these results establish attosecond streaking as a route to sub-cycle quantum-optical metrology in the strong-field regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13485 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Attosecond Access to the Quantum Noise of Light Zhou, En-Rui Mao, Yi-Jia He, Pei-Lun He, Feng Quantum Physics Atomic Physics Characterizing the quantum state of intense light fields on sub-cycle timescales remains beyond the reach of existing methods. Here, we show that attosecond streaking provides direct, phase-sensitive access to the quantum properties of the driving field through delay-resolved photoelectron spectra. Using a Feynman--Vernon treatment, we decompose the influence of the quantized driving field on the photoelectron into coherent and fluctuation contributions. This yields a simple, moment-based characterization of the light state: the first moment of the photoelectron momentum distribution reveals the coherent displacement, while the second central moment captures the fluctuation contribution and, for squeezed states, exhibits a clear modulation at twice the driving frequency, directly signaling phase-sensitive quantum noise. Time-dependent Schrödinger equation simulations confirm these relations and enable retrieval of the coherent phase, the squeezing phase, and the relative strengths of the coherent and fluctuation contributions from delay-resolved spectra. Taken together, these results establish attosecond streaking as a route to sub-cycle quantum-optical metrology in the strong-field regime. |
| title | Attosecond Access to the Quantum Noise of Light |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2604.13485 |