Two-particle time-domain interferometry in the fractional quantum Hall effect regime

Quasi-particles are elementary excitations of condensed matter quantum phases. Demonstrating that they keep quantum coherence while propagating is a fundamental issue for their manipulation for quantum information tasks. Here, we consider anyons, the fractionally charged quasi-particles of the Fractional Quantum Hall Effect occurring in two-dimensional electronic conductors in high magnetic fields. They obey anyonic statistics, intermediate between fermionic and bosonic. Surprisingly, anyons show large quantum coherence when transmitted through the localized states of electronic Fabry-Pérot interferometers, but almost no quantum interference when transmitted via the propagating states of Mach-Zehnder interferometers. Here, using a novel interferometric approach, we demonstrate that anyons do keep quantum coherence while propagating. Performing two-particle time-domain interference measurements sensitive to the two-particle Hanbury Brown Twiss phase, we find 53 and 60% visibilities for anyons with charges e/5 and e/3. Our results give a positive message for the challenge of performing controlled quantum coherent braiding of anyons.

Kapfer, M.Université Paris-Saclay,University Paris-Saclay (författare)
Nath, J.Université Paris-Saclay,University Paris-Saclay (författare)
Roulleau, PredenUniversité Paris-Saclay,University Paris-Saclay (författare)
Acciai, Matteo,1992Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)acciai (författare)
Splettstoesser, Janine,1977Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)janines (författare)
Farrer, I.University of Sheffield (författare)
Ritchie, D. A.University Of Cambridge (författare)
Glattli, D. ChristianUniversité Paris-Saclay,University Paris-Saclay (författare)
Université Paris-SaclayChalmers tekniska högskola (creator_code:org_t)

Ingår i:Nature Communications: Springer Science and Business Media LLC13:1, s. 5863-2041-17232041-1723

Av författaren/redakt...: Taktak, Imen; Kapfer, M.; Nath, J.; Roulleau, Preden; Acciai, Matteo, ...; Splettstoesser, ...; visa fler...; Farrer, I.; Ritchie, D. A.; Glattli, D. Chri ...; visa färre...

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