A twofold quantum delayed-choice experiment in a superconducting circuit

A twofold quantum delayed-choice experiment in a superconducting circuit

Wave-particle complementarity lies at the heart of quantum mechanics. To illustrate this mysterious feature, Wheeler proposed the delayed-choice experiment, where a quantum system manifests the wave- or particle-like attribute, depending on the experimental arrangement, which is made after the system has entered the interferometer. In recent quantum delayed-choice experiments, these two complem...

A quantum delayed-choice experiment.

Quantum systems exhibit particle- or wavelike behavior depending on the experimental apparatus they are confronted by. This wave-particle duality is at the heart of quantum mechanics. Its paradoxical nature is best captured in the delayed-choice thought experiment, in which a photon is forced to choose a behavior before the observer decides what to measure. Here, we report on a quantum delayed-...

A quantum delayed-choice experiment enabled by entanglement

Decoherence in a superconducting quantum bit circuit

G. Ithier,1 E. Collin,1 P. Joyez,1 P. J. Meeson,1,2 D. Vion,1 D. Esteve,1 F. Chiarello,3 A. Shnirman,4 Y. Makhlin,4,5 J. Schriefl,4,6 and G. Schön4 1Quantronics Group, Service de Physique de l’Etat Condensé, DSM/DRECAM, CEA Saclay, 91191 Gif-sur-Yvette, France 2Department of Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey TW20 0EX, United Kingdom 3Istituto di Fotonica e...

Quantum Delayed-Choice Experiment with a Beam Splitter in a Quantum Superposition.

A quantum system can behave as a wave or as a particle, depending on the experimental arrangement. When, for example, measuring a photon using a Mach-Zehnder interferometer, the photon acts as a wave if the second beam splitter is inserted, but as a particle if this beam splitter is omitted. The decision of whether or not to insert this beam splitter can be made after the photon has entered the...