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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects IV

Q 66.2: Vortrag

Freitag, 18. März 2022, 10:45–11:00, Q-H13

Many-body coherence and entanglement from randomized correlation measurements — •Eric Brunner^1,2, Andreas Buchleitner^1,2, and Gabriel Dufour^1,2 — ¹Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Deutschland — ²EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Deutschland

We show that k-point correlation measurements on output of a non-interacting, multimode random unitary allow to quantify the k-particle coherence of N ≥ k identical (bosonic or fermionic) particles. We establish a strictly monotonic relationship between k-particle coherence, the interference contrast in the experimentally accessible counting statistics, and the degree of the particles’ mutual distinguishability, as controlled by their internal degrees of freedom, given separable many-particle input states. Non-separability on input can be unveiled by comparison of correlation measurements of different orders.