Quantum logical controlled-NOT gate in a lithium niobate-on-insulator photonic quantum walk
Loading...
Author (Corporation)
Publication date
17.11.2023
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Quantum Science and Technology
Special issue
DOI of the original publication
Link
Series
Series number
Volume
9
Issue / Number
1
Pages / Duration
Patent number
Publisher / Publishing institution
Institute of Physics Publishing
Place of publication / Event location
Bristol
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
The two-qubit controlled-NOT gate is one of the central entangling operations in quantum information technology. The controlled-NOT gate for single photon qubits is normally realized as a network of five individual beamsplitters on six optical modes. Quantum walks (QWs) are an alternative photonic architecture involving arrays of coupled waveguides, which have been successful for investigating condensed matter physics, however, have not yet been applied to quantum logical operations. Here, we engineer the tight-binding Hamiltonian of an array of lithium niobate-on-insulator waveguides to experimentally demonstrate the two-qubit controlled-NOT gate in a QW. We measure the two-qubit transfer matrix with 0.938 ± 0.003 fidelity, and we use the gate to generate entangled qubits with 0.945 ± 0.002 fidelity by preparing the control photon in a superposition state. Our results highlight a new application for QWs that use a compact multi-mode interaction region to realize large multi-component quantum circuits.
Keywords
Quantum computing, Integrated photonics
Subject (DDC)
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
2058-9565
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Hybrid
License
Citation
Chapman, R. J., Häusler, S., Finco, G., Kaufmann, F., & Grange, R. (2023). Quantum logical controlled-NOT gate in a lithium niobate-on-insulator photonic quantum walk. Quantum Science and Technology, 9(1). https://doi.org/10.1088/2058-9565/ad0a48