Detecting ground state qubit self-excitations in circuit QED: slow quantum anti-Zeno effect

TL;DR

This paper investigates how slow repeated measurements can detect qubit self-excitations in circuit QED systems, revealing an exponential growth in excitation probability akin to the quantum anti-Zeno effect, with practical relevance for current superconducting circuits.

Contribution

It demonstrates the feasibility of observing the quantum anti-Zeno effect in ultrastrongly coupled qubit-cavity systems using slow measurements.

Findings

Detection of qubit self-excitations with few imperfect measurements

Exponential increase in excitation probability over time

Relevance to current superconducting circuit technology

Abstract

In this work we study an ultrastrong coupled qubit-cavity system subjected to slow repeated measurements. We demonstrate that even under a few imperfect measurements it is possible to detect transitions of the qubit from its free ground state to the excited state. The excitation probability grows exponentially fast in analogy with the quantum anti-Zeno effect. The dynamics and physics described in this paper is accessible to current superconducting circuit technology.