Electronic implementations of Interaction-Free Measurements

TL;DR

This paper explores three innovative solid-state nanodevice implementations of interaction-free measurements, demonstrating their ability to detect dephasing sources without compromising quantum coherence, with potential applications in quantum device diagnostics.

Contribution

It introduces three novel electronic implementations of interaction-free measurements in solid-state systems, expanding the possibilities for noninvasive quantum sensing.

Findings

Dephasing sources can be detected without coherence loss.

Three different interferometric setups are feasible for IFMs.

Electronic IFMs could enhance quantum device diagnostics.

Abstract

Three different implementations of interaction-free measurements (IFMs) in solid-state nanodevices are discussed. The first one is based on a series of concatenated Mach-Zehnder interferometers, in analogy to optical-IFM setups. The second one consists of a single interferometer and concatenation is achieved in the time domain making use of a quantized electron emitter. The third implementation consists of an asymmetric Aharonov-Bohm ring. For all three cases we show that the presence of a dephasing source acting on one arm of the interferometer can be detected without degrading the coherence of the measured current. Electronic implementations of IFMs in nanoelectronics may play a fundamental role as very accurate and noninvasive measuring schemes for quantum devices.