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Experimental demonstration of delayed-choice decoherence suppression

Author

Listed:
  • Jong-Chan Lee

    (Pohang University of Science and Technology (POSTECH))

  • Hyang-Tag Lim

    (Pohang University of Science and Technology (POSTECH))

  • Kang-Hee Hong

    (Pohang University of Science and Technology (POSTECH))

  • Youn-Chang Jeong

    (Pohang University of Science and Technology (POSTECH))

  • M. S. Kim

    (QOLS, Blackett Laboratory, Imperial College London
    School of Computational Sciences, Korea Institute for Advanced Study)

  • Yoon-Ho Kim

    (Pohang University of Science and Technology (POSTECH))

Abstract

Wheeler’s delayed-choice experiment illustrates vividly that the observer plays a central role in quantum physics by demonstrating that complementarity or wave–particle duality can be enforced even after the photon has already entered the interferometer. The delayed-choice quantum eraser experiment further demonstrates that complementarity can be enforced even after detection of a quantum system, elucidating the foundational nature of complementarity in quantum physics. However, the applicability of the delayed-choice method for practical quantum information protocols continues to be an open question. Here, we introduce and experimentally demonstrate the delayed-choice decoherence suppression protocol, in which the decision to suppress decoherence on an entangled two-qubit state is delayed until after the decoherence and even after the detection of a qubit. Our result suggests a new way to tackle Markovian decoherence in a delayed manner, applicable for practical entanglement distribution over a dissipative channel.

Suggested Citation

  • Jong-Chan Lee & Hyang-Tag Lim & Kang-Hee Hong & Youn-Chang Jeong & M. S. Kim & Yoon-Ho Kim, 2014. "Experimental demonstration of delayed-choice decoherence suppression," Nature Communications, Nature, vol. 5(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5522
    DOI: 10.1038/ncomms5522
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