Four-photon subtraction from picosecond squeezed vacuum demonstrating Wigner negativity without loss correction
Year: 2026
Type: article
Abstract: Multiphoton subtraction from a traveling squeezed vacuum is a standard route to non-Gaussian optical-state engineering. High state-generation rates call for ultrashort optical pulses driven by high-repetition-rate lasers, but combining higher-order subtraction with ultrashort pulsed light and full state reconstruction remains challenging. Here we demonstrate up to four-photon subtraction from 10-ps squeezed-vacuum wave packets generated by a broadband waveguide optical parametric amplifier. Using a Ti-Au transition-edge sensor for photon-number-resolved heralding and homodyne tomography on the signal mode, we reconstruct the generated states up to the four-photon-subtracted case. The reconstructed states exhibit clear parity-dependent structure and visible Wigner-function negativity without loss correction. These results extend the experimentally accessible regime of multiphoton subtraction in broadband traveling optical modes and establish a platform for non-Gaussian optical resource-state engineering in continuous-variable quantum optics.
Source: Physical Review A
DOI: 10.1103/6tlg-7qgm
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,675
Funders: European Commission, Japan Science and Technology Corporation, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, Research Foundation for Opto-Science and Technology, University of Tokyo Foundation, Japan Society for the Promotion of Science, Horizon 2020, Exploratory Research for Advanced Technology
OpenAlex ID: W4407571432