Speaker: Christoph Dittel (University of Freiburg)
Indistinguishability is the essential ingredient for many-body interference — a purely
quantum mechanical interference effect between many identical bosonic or fermionic
particles that can be exploited for a variety of applications, ranging from simulations with
ultracold atoms to photonic quantum information processing. In this talk I give an
introduction into this fascinating many-body property. Starting from its consequences on
interference effects, I show how partial particle distinguishability entails a wave-particle
duality relation on the many-body level. Moreover, I discuss how partial distinguishability
due to mixedness — in the particles’ internal degrees of freedom — induces many-body
decoherence whose strength increases exponentially in the number of constituents.
Nobel Prize in Physics 2022 awarded to Alain Aspect, John Clauser and Anton Zeilinger!