A photonic chip experimentally prepares and verifies the λ subgraph state from quantum random network theory, a two-Bell-pair state obtained from a four-node resource via local operations and postselection.
Three-dimensional entanglement on a silicon chip
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abstract
Entanglement is a counterintuitive feature of quantum physics that is at the heart of quantum technology. High-dimensional quantum states offer unique advantages in various quantum information tasks. Integrated photonic chips have recently emerged as a leading platform for the generation, manipulation and detection of entangled photons. Here, we report a silicon photonic chip that uses novel interferometric resonance-enhanced photon-pair sources, spectral demultiplexers and high-dimensional reconfigurable circuitries to generate, manipulate and analyse path-entangled three-dimensional qutrit states. By minimizing on-chip electrical and thermal cross-talk, we obtain high-quality quantum interference with visibilities above 96.5% and a maximumly entangled qutrit state with a fidelity of 95.5%. We further explore the fundamental properties of entangled qutrits to test quantum nonlocality and contextuality, and to implement quantum simulations of graphs and high-precision optical phase measurements. Our work paves the path for the development of multiphoton high-dimensional quantum technologies.
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quant-ph 1years
2026 1verdicts
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Photonic realization of a subgraph extraction in a quantum random network
A photonic chip experimentally prepares and verifies the λ subgraph state from quantum random network theory, a two-Bell-pair state obtained from a four-node resource via local operations and postselection.