Noise-robust preparation contextuality shared between any number of observers via unsharp measurements

Abstract

Multiple observers who independently harvest nonclassical correlations from a single physical system share the system's ability to enable quantum correlations. We show that any number of independent observers can share the preparation contextual outcome statistics enabled by state ensembles in quantum theory. Furthermore, we show that even in the presence of any amount of white noise, there exists quantum ensembles that enable such shared preparation contextuality. The findings are experimentally realised by applying sequential unsharp measurements to an optical qubit ensemble which reveals three shared demonstrations of preparation contextuality.

H. A. and N. W. contributed equally to this work

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Cited by in corpus (18)

• Experimental characterisation of unsharp qubit observables and sequential measurement incompatibility via quantum random access codes
• Experimental Certification of Sustained Entanglement and Nonlocality after Sequential Measurements
• Detection of genuine tripartite entanglement by multiple sequential observers
• Genuine Einstein-Podolsky-Rosen steering of three-qubit states by multiple sequential observers
• Recycling qubits for the generation of Bell nonlocality between independent sequential observers
• Projective measurements are sufficient for recycling nonlocality
• Network nonlocality sharing via weak measurements in the extended bilocal scenario
• Quantum Correlation Sharing: A Review On Recent Progress From Nonlocality To Other Non-Classical Correlations
• Bounding and simulating contextual correlations in quantum theory
• Ability of unbounded pairs of observers to achieve quantum advantage in random access codes with a single pair of qubits
• Sharing preparation contextuality in Bell experiment by arbitrary pair of sequential observers
• Unbounded Sharing of Nonlocality Using Projective Measurements
• Limits of network nonlocality probed by time-like separated observers
• Revealing quantum contextuality using a single measurement device
• Simulating quantum instruments with projective measurements and quantum post-processing
• Security of Device-independent Quantum Key Distribution under Sequential Attack
• Recovery of resources through sequential noisy measurements
• Robust device-independent characterization of sharpness and incompatibility of unsharp instruments