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Loss-tolerant state engineering for quantum-enhanced metrology via the reverse Hong–Ou–Mandel effect

Author

Listed:
  • Alexander E. Ulanov

    (Russian Quantum Center
    Moscow Institute of Physics and Technology)

  • Ilya A. Fedorov

    (Russian Quantum Center
    P.N. Lebedev Physics Institute)

  • Demid Sychev

    (Russian Quantum Center)

  • Philippe Grangier

    (Laboratoire Charles Fabry, Institut d’Optique Graduate School, CNRS, Université Paris-Saclay)

  • A. I. Lvovsky

    (Russian Quantum Center
    P.N. Lebedev Physics Institute
    Institute for Quantum Science and Technology, University of Calgary)

Abstract

Highly entangled quantum states, shared by remote parties, are vital for quantum communications and metrology. Particularly promising are the N00N states—entangled N-photon wavepackets delocalized between two different locations—which outperform coherent states in measurement sensitivity. However, these states are notoriously vulnerable to losses, making them difficult to both share them between remote locations and recombine in order to exploit interference effects. Here we address this challenge by utilizing the reverse Hong–Ou–Mandel effect to prepare a high-fidelity two-photon N00N state shared between two parties connected by a lossy optical medium. We measure the prepared state by two-mode homodyne tomography, thereby demonstrating that the enhanced phase sensitivity can be exploited without recombining the two parts of the N00N state. Finally, we demonstrate the application of our method to remotely prepare superpositions of coherent states, known as Schrödinger’s cat states.

Suggested Citation

  • Alexander E. Ulanov & Ilya A. Fedorov & Demid Sychev & Philippe Grangier & A. I. Lvovsky, 2016. "Loss-tolerant state engineering for quantum-enhanced metrology via the reverse Hong–Ou–Mandel effect," Nature Communications, Nature, vol. 7(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11925
    DOI: 10.1038/ncomms11925
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    Cited by:

    1. Changdong Chen & Xiao Li & Weimian Li & Ming Xue & Yaoyao Shi & Daxing Dong & Yadong Xu & Youwen Liu & Yangyang Fu, 2024. "Super-resolution acoustic displacement metrology through topological pairs in orbital meta-atoms," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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