State-recycling method for testing contextuality

TL;DR

This paper introduces a state-recycling method for testing quantum contextuality, allowing multiple measurement rounds on the same system output, simplifying experimental procedures compared to traditional methods.

Contribution

The authors propose a novel state-recycling approach enabling sequential measurement of contextuality without re-preparing the system, reducing experimental complexity.

Findings

Contextuality can be demonstrated through sequential measurements on the same system output.

The method simplifies experimental setups for testing contextuality.

State-recycling preserves the ability to observe state-independent contextuality.

Abstract

Quantum nonlocality and contextuality are two phenomena stemming from nonclassical correlations. Whereas the former requires entanglement that is consumed in the measurement process the latter can occur for any state if one chooses a proper set of measurements. Despite this stark differences experimental tests of both phenomena were similar so far. For each run of the experiment one had to use a different copy of a physical system prepared according to the same procedure, or the system had to be brought to its initial state. Here we show that this is not necessary and that the state-independent contextuality can be manifested in a scenario in which each measurement round is done on an output state from the previous round.