Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Information I

Q 17.4: Vortrag

Dienstag, 12. März 2024, 11:45–12:00, HS 1199

Indistinguishability of identical bosons from a quantum information theory perspective — Matthias Englbrecht^1,2, Tristan Kraft^1,2, Christoph Dittel^3,4,5, Andreas Buchleitner^3,4, •Géza Giedke^6,7, and Barbara Kraus^1,2 — ¹Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria — ²Department of Physics, QAA, TU Munich, Garching, Germany — ³Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany — ⁴EUCOR Centre for Quantum Science and Quantum Computing, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany — ⁵Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany — ⁶Donostia International Physics Center, San Sebastián, Spain — ⁷IKERBASQUE, Basque Foundation for Science, Bilbao, Spain

We present a general theory of indistinguishability of identical bosons in experiments consisting of passive linear optics followed by particle number detection. Our approach uses tools from quantum information theory and the results do neither rely on additional assumptions on the input state of the interferometer, such as fixed mode occupation number, nor on the degrees of freedom that potentially make the particles distinguishable. We identify the expectation value of the projector onto the N-particle symmetric subspace as an operationally meaningful measure of indistinguishability, and derive tight and efficiently measureable lower bounds. We present a definition of perfect distinguishability and characterize the corresponding set of states.

Keywords: indistinguishability, identical particles