Barratt, C J; Ryu, S; Clark, L A; Sim, H S; Kataoka, M; Emary, C (2021) Asymmetric arms maximize visibility in hot-electron interferometers. Physical Review B, 104 (3). 035436

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Abstract

We consider theoretically an electronic Mach-Zehnder interferometer constructed from quantum Hall edge channels and quantum point contacts, fed with single electrons from a dynamic quantum dot source. By considering the energy dependence of the edge-channel guide centers, we give an account of the phase averaging in this setup that is particularly relevant for the short, high-energy wave packets injected by this type of electron source. We present both analytic and numerical results for the energy-dependent arrival time distributions of the electrons and also give an analysis of the delay times associated with the quantum point contacts and their effects on the interference patterns. A key finding is that, contrary to expectation, maximum visibility requires the interferometer arms to be different in length, with an offset of up to a micron for typical parameters. By designing interferometers that incorporate this asymmetry in their geometry, phase-averaging effects can be overcome such that visibility is only limited by other incoherent mechanisms.

Item Type:	Article
Subjects:	Quantum Phenomena > Quantum Information Processing and Communication
Divisions:	Quantum Technologies
Identification number/DOI:	10.1103/PhysRevB.104.035436
Last Modified:	12 Jul 2023 13:42
URI:	https://eprintspublications.npl.co.uk/id/eprint/9436