Device-independent test of a delayed choice experiment

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-...

Device-independent dimension test in a multiparty Bell experiment

Zhaohui Wei and Jamie Sikora Centre for Quantum Technologies, National University of Singapore, Singapore School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, P. R. China MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, UMI 3...

Entanglement-enabled delayed-choice experiment.

Wave-particle complementarity is one of the most intriguing features of quantum physics. To emphasize this measurement apparatus-dependent nature, experiments have been performed in which the output beam splitter of a Mach-Zehnder interferometer is inserted or removed after a photon has already entered the device. A recent extension suggested using a quantum beam splitter at the interferometer'...

An entanglement-enabled delayed-choice experiment

Extending Wheeler’s delayed-choice experiment to space

Gedankenexperiments have consistently played a major role in the development of quantum theory. A paradigmatic example is Wheeler's delayed-choice experiment, a wave-particle duality test that cannot be fully understood using only classical concepts. We implement Wheeler's idea along a satellite-ground interferometer that extends for thousands of kilometers in space. We exploit temporal and pol...