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

24 Feb 2021  ·  Kun Liu, Tongjun Liu, Wei Fang, Jian Li, Qin Wang ·

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.

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Quantum Physics