Generation of Schrödinger cat states with Wigner negativity using a continuous-wave low-loss waveguide optical parametric amplifier

Author:

Takase Kan1,Kawasaki Akito1,Jeong Byung Kyu1,Endo Mamoru1ORCID,Kashiwazaki Takahiro2ORCID,Kazama Takushi2ORCID,Enbutsu Koji2,Watanabe Kei2,Umeki Takeshi2,Miki Shigehito34,Terai Hirotaka3,Yabuno Masahiro3,China Fumihiro3,Asavanant Warit1,Yoshikawa Jun-ichi1,Furusawa Akira15

Affiliation:

1. The University of Tokyo

2. NTT Device Technology Labs

3. National Institute of Information and Communications Technology

4. Kobe University

5. RIKEN Center for Quantum Computing

Abstract

Continuous-wave (CW) squeezed light is used in the generation of various optical quantum states, and thus is a fundamental resource of fault-tolerant universal quantum computation using optical continuous variables. To realize a practical quantum computer, a waveguide optical parametric amplifier (OPA) is an attractive CW squeezed light source in terms of its THz-order bandwidth and suitability for modularization. The usages of a waveguide OPA in quantum applications thus far, however, are limited due to the difficulty of the generation of the squeezed light with a high purity. In this paper, we report the first observation of Wigner negativity of the states generated by a heralding method using a waveguide OPA. We generate Schrödinger cat states at the wavelength of 1545 nm with Wigner negativity using a quasi-single-mode ZnO-doped periodically poled LiNbO3 waveguide module we developed. Wigner negativity is regarded as an important indicator of the usefulness of the quantum states as it is essential in the fault-tolerant universal quantum computation. Our result shows that our waveguide OPA can be used in wide range of quantum applications leading to a THz-clock optical quantum computer.

Funder

Japan Science and Technology Agency

Japan Society for the Promotion of Science

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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