# Non-Gaussian quantum state generation by multi-photon subtraction at the telecommunication wavelength

**Authors:** Mamoru Endo, Ruofan He, Tatsuki Sonoyama, Kazuma Takahashi, Takahiro Kashiwazaki, Takeshi Umeki, Sachiko Takasu, Kaori Hattori, Daiji Fukuda, Kosuke Fukui, Kan Takase, Warit Asavanant, Petr Marek, Radim Filip, Akira Furusawa  
**arXiv:** [2301.09871](https://arxiv.org/abs/2301.09871)  
**Date:** 2023-01-24  
**Summary page:** https://www.summarizepaper.com/fr/paper/2301.09871v1/

## Abstract

In the field of continuous-variable quantum information processing, non-Gaussian states with negative values of the Wigner function are crucial for the development of a fault-tolerant universal quantum computer. While several non-Gaussian states have been generated experimentally, none have been created using ultrashort optical wave packets, which are necessary for high-speed quantum computation, in the telecommunication wavelength band where mature optical communication technology is available. In this paper, we present the generation of non-Gaussian states on wave packets with a short 8-ps duration in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three photons. We used a low-loss, quasi-single spatial mode waveguide optical parametric amplifier, a superconducting transition edge sensor, and a phase-locked pulsed homodyne measurement system to observe negative values of the Wigner function without loss correction up to three-photon subtraction. These results can be extended to the generation of more complicated non-Gaussian states and are a key technology in the pursuit of high-speed optical quantum computation.