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18-Qubit Entanglement with Six Photons' Three Degrees of Freedom.

08:00 EDT 29th June 2018 | BioPortfolio

Summary of "18-Qubit Entanglement with Six Photons' Three Degrees of Freedom."

Full control of multiple degrees of freedom of multiple particles represents a fundamental ability for quantum information processing. We experimentally demonstrate an 18-qubit Greenberger-Horne-Zeilinger entanglement by simultaneous exploiting three different degrees of freedom of six photons, including their paths, polarization, and orbital angular momentum. We develop high-stability interferometers for reversible quantum logic operations between the photons' different degrees of freedom with precision and efficiencies close to unity, enabling simultaneous readout of 2^{18}=262 144 outcome combinations of the 18-qubit state. A state fidelity of 0.708±0.016 is measured, confirming the genuine entanglement of all 18 qubits.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 260502

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