Continuous-variable entanglement on a chip

By G. Masada, Kazunori Miyata, Alberto Politi, T. Hashimoto, Jeremy Lloyd O'Brien, Akira Furusawa. Nature Photonics, 2015

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The capabilities of continuous variable (CV) quantum technology — homodyne detection and characterization of Einstein–Podolsky–Rosen entangled light — are demonstrated by sending CV light at 860 nm to optical circuits on a chip. Encoding quantum information in continuous variables, as the quadrature of electromagnetic fields, is a powerful approach to quantum information science and technology1. Continuous-variable entanglement (light beams in Einstein–Podolsky–Rosen, or EPR2, states) is a key resource for quantum information protocols3 and enables hybridization between continuous-variable and single-photon discrete-variable qubit systems4. 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/587d9e83be3f3e219f6ef9f0c453742be4b10725