Experimental demonstration of delayed-choice decoherence suppression

Jong-Chan Lee, Hyang-Tag Lim, Kang-Hee Hong, Youn-Chang Jeong, M. S. Kim and Yoon-Ho Kim ()
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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
Yoon-Ho Kim: Pohang University of Science and Technology (POSTECH)

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5522

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