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.
| Original language | English |
|---|---|
| Article number | 4522 |
| Journal | Nature Communications |
| Volume | 5 |
| DOIs | |
| State | Published - 29 Jul 2014 |
Bibliographical note
Funding Information:This work was supported in part by the National Research Foundation of Korea (Grant No. 2011-0021452 and No. 2013R1A2A1A01006029). J.-C.L. and H.-T.L. acknowledge support from the National Junior Research Fellowship (Grant No. 2012-000741 and 2012-000642, respectively). Y.-C.J. acknowledges support from BK21. M.S.K. acknowledges support from UK EPSRC. M.S.K. thanks M. Genoni for discussions.