Quantum nondemolition measurements of a flux qubit coupled to a noisy detector

TL;DR

This paper provides a theoretical analysis of quantum nondemolition measurements of a flux qubit, focusing on measurement-induced dephasing, frequency-dependent measurement probability, and optimal conditions for qubit state access.

Contribution

It introduces a detailed analytical model of back action noise effects and identifies conditions for maximum measurement rate in flux qubit measurements.

Findings

Measurement probability is frequency dependent and related to dephasing.

Maximum measurement rate occurs when detuning equals coupling strength.

Quantum tunneling destroys initial qubit information.

Abstract

We theoretically study the measurement-induced dephasing caused by back action noise in quantum nondemolition measurements of a superconducting flux qubit which is coupled to a superconducting quantum interference device (SQUID). Our analytical results indicate that information on qubit flows from qubit to detector, while quantum fluctuations which may cause dephasing of the qubit also inject to qubit. Furthermore, the measurement probability is frequency dependent in a short time scale and has a close relationship with the measurement-induced dephasing. When the detuning between driven and bare resonator equals coupling strength, we will access the state of qubit more easily. In other words, we obtain the maximum measurement rate. Finally, we analyzed mixed effect caused by coupling between non-diagonal term and external variable. We found that the initial information of qubit is destroyed due to quantum tunneling between the qubit states.