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Publication Citation: Continuous-variable quantum compressed sensing

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Author(s): Yi-Kai Liu; Matthias Ohliger; Vincent Nesme; David Gross; Jens Eisert;
Title: Continuous-variable quantum compressed sensing
Published: July 09, 2012
Abstract: We introduce a novel method to faithfully reconstruct unknown quantum states that are approximately low-rank, using only a few measurement settings. The method is general enough to allow for measurements from a continuous family, and is also applicable to continuous-variable states. As a technical result, this work generalizes quantum compressed sensing to the situation where the measured observables are taken from a so-called tight frame (rather than an orthonormal basis) -- hence covering most realistic measurement scenarios. As an application, we discuss the reconstruction of quantum states of light from homodyne detection and other types of measurements, and we present simulations that show the advantage of the proposed compressed sensing technique over present methods. Finally, we introduce a method to construct a certificate which guarantees the success of the reconstruction with no assumption on the state, and we show how slightly more measurements give rise to "universal" state reconstruction that is highly robust to noise.
Citation: New Journal of Physics
Keywords: quantum state tomography, compressed sensing, homodyne tomography
Research Areas: Quantum Computing, Quantum Devices, Quantum Optics
PDF version: PDF Document Click here to retrieve PDF version of paper (376KB)