We show that some sets of quantum observables are unique up to an isometry and have a
contextuality witness that attains the same value for any initial state. We prove that these two …

Contextuality is a distinctive feature of quantum theory and a fundamental resource for
quantum computation. However, existing examples of contextuality in high-dimensional …

Analyzing the geometry of correlation sets constrained by general causal structures is of
paramount importance for foundational and quantum technology research. Addressing this …

In quantum cryptography, secure randomness expansion involves using a short private
string of random bits to generate a longer one, even in the presence of an adversary who …

Self-testing is pivotal in characterizing quantum systems with minimal internal assumptions,
representing the most robust certification method. In the existing self-testing literature, self …

Quantum mechanics imposes limits on the statistics of certain observables. Perhaps the
most famous example is the uncertainty principle. Similar trade-offs also exist for the …

We show that some sets of quantum observables are unique up to an isometry and have a
contextuality witness that attains the same value for any initial state. These two properties …

Self-testing has been established as a major approach for quantum device certification
based on experimental statistics with minimal assumptions. However, despite more than 20 …

Nonstabilizerness, also known as magic, is a crucial resource for quantum computation. The
growth in complexity of quantum processing units (QPUs) demands robust and scalable …

We report the first experimental demonstration of the odd-cycle game. We entangle two ions
separated by~ 2 m and the players use them to win the odd-cycle game significantly more …