Logical states for fault-tolerant quantum computation with propagating light

Konno S, Asavanant W, Hanamura F, Nagayoshi H, Fukui K, Sakaguchi A, Ide R, China F, Yabuno M, Miki S, Terai H, Takase K, Endo M, Marek P, Filip R, van Loock P, Furusawa A (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Science American Association for the Advancement of Science

Book Volume: 383

Pages Range: 289-293

Issue: 6680

DOI: 10.1126/science.adk7560

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.

Authors with CRIS profile

Peter van Loock

Additional Organisation(s)

Sonderforschungsbereich/Transregio 306/1: Quantenkooperativität von Licht und Materie - QuCoLiMa

Involved external institutions

Japan National Institute of Information and Communications Technology (NICT) / 情報通信研究機構 JP Japan (JP) University of Tokyo JP Japan (JP) Riken Center for Quantum Computing JP Japan (JP) Palacky University Olomouc / Univerzita Palackého v Olomouci CZ Czech Republic (CZ) Kobe University / 神戸大学 JP Japan (JP) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Konno, S., Asavanant, W., Hanamura, F., Nagayoshi, H., Fukui, K., Sakaguchi, A.,... Furusawa, A. (2024). Logical states for fault-tolerant quantum computation with propagating light. Science, 383, 289-293. https://doi.org/10.1126/science.adk7560

MLA:

Konno, Shunya, et al. "Logical states for fault-tolerant quantum computation with propagating light." Science 383 (2024): 289-293.

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