# 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/en/paper/2301.09871v1/

## Key points

- Mamoru Endo and colleagues have made a breakthrough in generating non-Gaussian states on wave packets with an 8-ps duration in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three photons.
- The team 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.
- This research paves the way for future advancements in quantum computing technology that could revolutionize various fields such as cryptography and drug discovery.
- The development of a fault-tolerant universal quantum computer requires the generation of non-Gaussian states with negative values of the Wigner function in continuous-variable quantum information processing.
- None of the previously generated non-Gaussian states have been created using ultrashort optical wave packets in the telecommunication wavelength band where mature optical communication technology is available.
- These results can be extended to generate more complicated non-Gaussian states and are crucial for high-speed optical quantum computation.

## Summary

In this paper, Mamoru Endo and colleagues present a breakthrough in the generation of non-Gaussian states on wave packets with an 8-ps duration in the 1545.32 nm telecommunication wavelength band using photon subtraction up to three photons. The team 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. This research paves the way for future advancements in quantum computing technology that could revolutionize various fields such as cryptography and drug discovery. The development of a fault-tolerant universal quantum computer requires the generation of non-Gaussian states with negative values of the Wigner function in continuous-variable quantum information processing. While several non-Gaussian states have been generated experimentally, none have been created using ultrashort optical wave packets in the telecommunication wavelength band where mature optical communication technology is available. These results can be extended to generate more complicated non-Gaussian states and are crucial for high-speed optical quantum computation.