Journal
SCIENCE
Volume 366, Issue 6463, Pages 369-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aay4354
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Funding
- Danish National Research Foundation through the Center for Macroscopic Quantum States (bigQ) [DNRF142]
- VILLUM FOUNDATION [10119]
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Measurement-based quantum computation offers exponential computational speed-up through simple measurements on a large entangled cluster state. We propose and demonstrate a scalable scheme for the generation of photonic cluster states suitable for universal measurement-based quantum computation. We exploit temporal multiplexing of squeezed light modes, delay loops, and beam-splitter transformations to deterministically generate a cylindrical cluster state with a two-dimensional (2D) topological structure as required for universal quantum information processing. The generated state consists of more than 30,000 entangled modes arranged in a cylindrical lattice with 24 modes on the circumference, defining the input register, and a length of 1250 modes, defining the computation depth. Our demonstrated source of two-dimensional cluster states can be combined with quantum error correction to enable fault-tolerant quantum computation.
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