Continuous-variable entanglement on a chip

Masada, Genta, Miyata, Kazunori, Politi, Alberto, Hashimoto, Toshikazu, O'Brien, Jeremy L. and Furusawa, Akira (2015) Continuous-variable entanglement on a chip. Nature Photonics, 9, 316-319. (doi:10.1038/nphoton.2015.42).

Abstract

Encoding quantum information in continuous variables, as the quadrature of electromagnetic fields, is a powerful approach to quantum information science and technology. Continuous-variable entanglement (light beams in Einstein–Podolsky–Rosen, or EPR, states) is a key resource for quantum information protocols and enables hybridization between continuous-variable and single-photon discrete-variable qubit systems. 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 continuous-variable 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.

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Contributors

Author: Alberto Politi

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