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

TL;DR

This paper demonstrates the generation of non-Gaussian quantum states in ultrashort telecommunication wavelength wave packets using multi-photon subtraction, advancing high-speed quantum computing capabilities.

Contribution

It presents the first generation of non-Gaussian states in ultrashort wave packets at telecom wavelengths via multi-photon subtraction, utilizing advanced optical and detection technology.

Findings

Negative Wigner function values observed without loss correction

Successful multi-photon subtraction up to three photons

Generation of non-Gaussian states in 8-ps wave packets

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.