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Continuous-variable entanglement on a chip
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DOI：10.1038/NPHOTON.2015.42.png)
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Encoding quantum information in continuous variables, as the quadrature of electromagnetic fields, is a powerful approach to quantum information science and technology(1). Continuousvariable entanglement (light beams in Einstein-PodolskyRosen, or EPR2, states) is a key resource for quantum information protocols(3) and enables hybridization between continuous-variable and single-photon discrete-variable qubit systems(4). However, continuous-variable systems are currently limited by their implementation in free-space optical networks, and the demand for increased complexity, low loss, high-precision alignment and stability, as well as hybridization, require an alternative approach. Here we present an integrated photonic implementation of the key capabilities for continuousvariable quantum technologies-the generation and characterization of EPR beams in a photonic chip. When combined with integrated squeezing and non-Gaussian operations, these results will open the way to universal quantum information processing with light.
Keyword:
QUANTUM TELEPORTATION
HYBRID ENTANGLEMENT
GENERATION
CRITERION
LIGHT
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