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AIP conference proceedings

Continuous-variable quantum information processing with squeezed states of light

Akira Furusawa, Alexander I. Lvovsky

Published Jan 1, 2009• 5 citations
Publisher
DOI
10.1063/1.3131294

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One of the leading approaches to large-scale quantum information processing (QIP) is the continuous-variable (CV) scheme based on time multiplexing (TM). As a fundamental building block for this approach, quantum light sources to sequentially produce time-multiplexed squeezed-light pulses are required; however, conventional CV TM experiments have used fixed light sources that can only output the squeezed pulses with the same squeezing levels and phases. We here demonstrate a programmable time-multiplexed squeezed light source that can generate sequential squeezed pulses with various squeezing levels and phases at a time interval below 100 ns. The generation pattern can be arbitrarily chosen by software without changing its hardware configuration. This is enabled by using a waveguide optical parametric amplifier and modulating its continuous pump light. Our light source will implement various large-scale CV QIP tasks.
Generation of ``squeezed'' light is a key technology for quantum information processing with continuous variables. In this field, continuous-variable quantum sampling is a promising candidate for near-term demonstration of quantum advantage. Despite many years of progress, though, a squeezed-light source suitable for quantum sampling has not been demonstrated. This work finally provides a blueprint for squeezed-light sources that can be used for large-scale quantum sampling applications, and thus will have an impact on advancing photonic quantum technology for practical deployment.