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Volume 16 Issue 4, April 2022

The quantum memristor

Artistic impression of a network of optically interconnected quantum memristors, which in the future could be the basis for a quantum neural network. Each quantum memristor, comprised of tunable integrated Mach–Zehnder interferometers operating on single photons, is able to encode and transmit quantum information while retaining a memory of the previously processed quantum states.

See Spagnolo et al. and Lamata

Image: Equinox Graphics Ltd and University of Vienna. Cover Design: Bethany Vukomanovic

News & Views

  • Weak interaction of light with matter makes its tunable control notoriously challenging, resulting in bulky and inefficient devices. Now, a study demonstrates that van der Waals antiferromagnets featuring strong spin-charge induced anisotropy could offer excellent control of light polarization selectivity.

    • Haonan Ling
    • Artur R. Davoyan
    News & Views


  • The local polarization of light in nanophotonic waveguides changes with the light’s direction of propagation. By electrically controlling the polarization of optically created waveguide-coupled excitons in a two-dimensional semiconductor, researchers demonstrate voltage-controlled routing of photons in an integrated nanophotonic device.

    • Arno Rauschenbeutel
    • Philipp Schneeweiss
    News & Views
  • A record-breaking microwave-to-optics conversion efficiency of 82% over a 1 MHz bandwidth for low photon numbers is achieved by using a gas of Rydberg atoms, paving the way towards applications in quantum technologies.

    • Jacob P. Covey
    News & Views
  • A photonic quantum memristor is experimentally demonstrated, paving the way to neuromorphic quantum computing.

    • Lucas Lamata
    News & Views
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Review Articles

  • Recent progress of table-top isolated attosecond light sources is reviewed with a focus on the related technologies for high-average-flux and high-peak-intensity attosecond bursts of light. An outlook on its applications is also provided.

    • Katsumi Midorikawa
    Review Article
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  • Researchers demonstrate a topological-cavity surface-emitting laser with a 10 W peak power and sub-degree beam divergence at 1,550 nm wavelength. The system is also capable of multiple-wavelength arrays.

    • Lechen Yang
    • Guangrui Li
    • Ling Lu
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