Engineering two-qubit mixed states with weak measurements

TL;DR

This paper demonstrates how weak measurement protocols can be used to engineer specific mixed quantum states, including discorded and entangled states, by continuously tuning protocol parameters.

Contribution

It introduces a novel method for on-demand engineering of mixed quantum states using weak measurements, extending previous pure state steering techniques.

Findings

Weak measurements can produce discorded states.

Continuous parameter variation guides states to entanglement.

Protocol enables on-demand mixed state preparation.

Abstract

It is known that protocols based on weak measurements can be used to steer quantum systems into pre-designated pure states. Here we show that weak-measurement-based steering protocols can be harnessed for on-demand engineering of $\textit{mixed}$ states. In particular, through a continuous variation of the protocol parameters, one can guide a classical target state to a discorded one, and further on, towards an entangled target state.