NMR implementation of Quantum Delayed-Choice Experiment
  We report the first experimental demonstration of quantum delayed-choice experiment via nuclear magnetic resonance techniques. An ensemble of molecules each with two spin-1/2 nuclei are used as target and the ancilla qubits to perform the quantum circuit corresponding the delayed-choice setup. As expected in theory, our experiments clearly demonstrate the continuous morphing of the target qubit between particle-like and wave-like behaviors. The experimental visibility of the interference patterns shows good agreement with the theory. 
Soumya Singha Roy, Abhishek Shukla, and T. S. Mahesh
quant-ph physics.atom-ph