Gottesman-Kitaev-Preskill qubit synthesizer for propagating light

Takase K, Fuku K, Kawasaki A, Asavanant W, Endo M, Yoshikawa Ji, van Loock P, Furusawa A (2023)

Publication Type: Journal article

Publication year: 2023

Journal

npj Quantum Information Nature Research

Book Volume: 9

Article Number: 98

Issue: 1

DOI: 10.1038/s41534-023-00772-y

Abstract

Practical quantum computing requires robust encoding of logical qubits in physical systems to protect fragile quantum information. Currently, the lack of scalability limits the logical encoding in most physical systems, and thus the high scalability of propagating light can be a game changer. However, propagating light also has difficulty in logical encoding due to weak nonlinearity. Here, we propose a synthesizer that encodes Gottesman-Kitaev-Preskill (GKP) qubits in propagating light by exploiting the nonlinearity of photon detectors. This synthesizer is based on an approach what we call Gaussian breeding, leading to the following four advantages: (i) systematic and rigorous synthesis of arbitrary GKP qubits, (ii) use of minimal resources, (iii) high fidelity and high success probability, and (iv) robustness against loss. There has been no protocol that incorporates all these advantages, and thus the proposed synthesizer excels in both performance and feasibility. By employing our method, one can generate GKP qubits using a few to several squeezed light sources, beam splitters and photon detectors.

Authors with CRIS profile

Peter van Loock

Additional Organisation(s)

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

Related research project(s)

Tailor-made beyond-one-excitation quantum states for quantum information and communication (A06) TRR 306: Quantenkooperativität von Licht und Materie – QuCoLiMa Jan. 1, 2021 - Dec. 31, 2024

Involved external institutions

University of Tokyo JP Japan (JP) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) RIKEN Center for Computational Science JP Japan (JP)

How to cite

APA:

Takase, K., Fuku, K., Kawasaki, A., Asavanant, W., Endo, M., Yoshikawa, J.-i.,... Furusawa, A. (2023). Gottesman-Kitaev-Preskill qubit synthesizer for propagating light. npj Quantum Information, 9. https://dx.doi.org/10.1038/s41534-023-00772-y

MLA:

Takase, Kan, et al. "Gottesman-Kitaev-Preskill qubit synthesizer for propagating light." npj Quantum Information 9 (2023).

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