Circumventing Detector Backaction on a Quantum Cyclotron

TL;DR

This paper presents a quantum calculation method to evade detector backaction in a one-electron quantum cyclotron, improving the precision of electron magnetic moment measurements by analyzing resonance lineshapes.

Contribution

It introduces the first quantum theoretical approach to circumvent detection backaction in an open quantum cyclotron system.

Findings

Backaction broadens resonance lineshapes, affecting measurement accuracy.

A steady state solution demonstrates a way to avoid backaction effects.

The method enhances the precision of fundamental electron property measurements.

Abstract

Detector backaction can be completely evaded when the state of a one-electron quantum cyclotron is detected, but it nonetheless significantly broadens the quantum-jump resonance lineshapes from which the cyclotron frequency can be deduced. This limits the accuracy with which the electron magnetic moment can be determined to test the standard model's most precise prediction. A steady state solution to a master equation, the first quantum calculation for the open quantum cyclotron system, illustrates a method to circumvent the detection backaction upon the measured frequency.