Logical states for fault-tolerant quantum computation with propagating light

Author:

Konno Shunya1ORCID,Asavanant Warit12ORCID,Hanamura Fumiya1ORCID,Nagayoshi Hironari1ORCID,Fukui Kosuke1ORCID,Sakaguchi Atsushi2ORCID,Ide Ryuhoh1ORCID,China Fumihiro3ORCID,Yabuno Masahiro3ORCID,Miki Shigehito34,Terai Hirotaka3ORCID,Takase Kan12ORCID,Endo Mamoru12ORCID,Marek Petr5ORCID,Filip Radim5ORCID,van Loock Peter6ORCID,Furusawa Akira12ORCID

Affiliation:

1. Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

2. Optical Quantum Computing Research Team, RIKEN Center for Quantum Computing, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

3. Advanced ICR Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka, Nishi, Kobe 651-2492, Japan.

4. Graduate School of Engineering, Kobe University, 1-1 Rokko-dai, Nada, Kobe 657-0013, Japan.

5. Department of Optics, Palacky University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic.

6. Institute of Physics, Johannes-Gutenberg University of Mainz, Staudingerweg 7, 55128 Mainz, Germany.

Abstract

To harness the potential of a quantum computer, quantum information must be protected against error by encoding it into a logical state that is suitable for quantum error correction. The Gottesman-Kitaev-Preskill (GKP) qubit is a promising candidate because the required multiqubit operations are readily available at optical frequency. To date, however, GKP qubits have been demonstrated only at mechanical and microwave frequencies. We realized a GKP state in propagating light at telecommunication wavelength and verified it through homodyne measurements without loss corrections. The generation is based on interference of cat states, followed by homodyne measurements. Our final states exhibit nonclassicality and non-Gaussianity, including the trident shape of faint instances of GKP states. Improvements toward brighter, multipeaked GKP qubits will be the basis for quantum computation with light.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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