Weak Measurements with Entangled Probes

TL;DR

This paper explores how encoding the imaginary part of a weak value onto an entangled probe can alter its entanglement, highlighting its potential for entanglement concentration and fundamental quantum insights.

Contribution

It demonstrates that the imaginary weak value can be used to modify entanglement in probes, revealing new applications in quantum information processing.

Findings

Encoding imaginary weak values affects entanglement content.

The probe observable can distinguish states of different entropies.

Potential applications in entanglement concentration protocols.

Abstract

Encoding the imaginary part of a weak value onto an initially entangled probe can modify its entanglement content - provided the probe observable can distinguish between states of different entropies. Apart from fundamental interest, this result illustrates the utility of the imaginary weak value as a calculational tool in certain entanglement concentration protocols.