Both qubits of the singlet state can be steered simultaneously by multiple independent observers via sequential measurement

TL;DR

This paper demonstrates that in a singlet state, both qubits can be simultaneously steered by multiple independent observers through sequential measurements, revealing new possibilities for sharing quantum correlations.

Contribution

It introduces a novel steering scenario where both subsystems are accessible by multiple observers, showing simultaneous steerability in a singlet state for the first time.

Findings

Both qubits in the singlet state can be simultaneously steered by two sequential observers.

The study extends understanding of sharing quantum correlations among multiple observers.

It highlights potential for more robust quantum communication protocols.

Abstract

Quantum correlation is a fundamental property which distinguishes quantum systems from classical ones, and it is also a fragile resource under projective measurement. Recently, it has been shown that a subsystem in entangled pairs can share nonlocality with multiple observers in sequence. Here we present a new steering scenario where both subsystems are accessible by multiple observers. And it is found that the two qubits in singlet state can be simultaneously steered by two sequential observers, respectively.