Journal
SCIENCE
Volume 362, Issue 6414, Pages 568-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau4296
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Funding
- Technion Society of Australia (NSW)
- NSW Department of Industry (University of Sydney)
- NSW Department of Industry (Technion collaborative photonics research project)
- School of Physics of the University of Sydney
- Australian Research Council [CE110001018, FL120100029]
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The robust generation and propagation of multiphoton quantum states are crucial for applications in quantum information, computing, and communications. Although photons are intrinsically well isolated from the thermal environment, scaling to large quantum optical devices is still limited by scattering loss and other errors arising from random fabrication imperfections. The recent discoveries regarding topological phases have introduced avenues to construct quantum systems that are protected against scattering and imperfections. We experimentally demonstrate topological protection of biphoton states, the building block for quantum information systems. We provide clear evidence of the robustness of the spatial features and the propagation constant of biphoton states generated within a nanophotonics lattice with nontrivial topology and propose a concrete path to build robust entangled states for quantum gates.
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