A matterless double slit

Understand

Double-slits provide incoming photons with a choice.

• Those that survive the passage have chosen from two possible paths which interfere to distribute them in a wave-like manner.
• Such wave-particle duality continues to be challenged and investigated in a broad range of disciplines with electrons, neutrons, helium atoms, C60 fullerenes, Bose-Einstein condensates and biological molecules.
• All variants have hitherto involved material constituents.