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An entanglement-enhanced microscope

Author

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  • Takafumi Ono

    (Research Institute for Electronic Science, Hokkaido University, N20W10
    The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1)

  • Ryo Okamoto

    (Research Institute for Electronic Science, Hokkaido University, N20W10
    The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1)

  • Shigeki Takeuchi

    (Research Institute for Electronic Science, Hokkaido University, N20W10
    The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1)

Abstract

Among the applications of optical phase measurement, the differential interference contrast microscope is widely used for the evaluation of opaque materials or biological tissues. However, the signal-to-noise ratio for a given light intensity is limited by the standard quantum limit, which is critical for measurements where the probe light intensity is limited to avoid damaging the sample. The standard quantum limit can only be beaten by using N quantum correlated particles, with an improvement factor of √N. Here we report the demonstration of an entanglement-enhanced microscope, which is a confocal-type differential interference contrast microscope where an entangled photon pair (N=2) source is used for illumination. An image of a Q shape carved in relief on the glass surface is obtained with better visibility than with a classical light source. The signal-to-noise ratio is 1.35±0.12 times better than that limited by the standard quantum limit.

Suggested Citation

  • Takafumi Ono & Ryo Okamoto & Shigeki Takeuchi, 2013. "An entanglement-enhanced microscope," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3426
    DOI: 10.1038/ncomms3426
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    Cited by:

    1. Hugo Defienne & Patrick Cameron & Bienvenu Ndagano & Ashley Lyons & Matthew Reichert & Jiuxuan Zhao & Andrew R. Harvey & Edoardo Charbon & Jason W. Fleischer & Daniele Faccio, 2022. "Pixel super-resolution with spatially entangled photons," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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