Certifying asymmetry in the configuration of three qubits

• URL: http://arxiv.org/abs/2506.09939v1
• Date: Wed, 11 Jun 2025 17:06:30 GMT
• Title: Certifying asymmetry in the configuration of three qubits
• Authors: Abdelmalek Taoutioui, Gábor Drótos, Tamás Vértesi,
• Abstract summary: We certify asymmetry in the configuration of the Bloch vectors of three unknown qubit states.<n>We numerically derive a bound $Q_textmirror$ for any mirror-symmetric configuration.<n>We implement our protocol on a public quantum processor.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We certify asymmetry in the configuration of the Bloch vectors of a set of three unknown qubit states within the dimensionally bounded prepare-and-measure scenario. To do this, we construct a linear witness from three simpler witnesses as building blocks, each featuring, along with two binary measurement settings, three preparations; two of them are associated with the certification task, while the third one serves as an auxiliary. The final witness is chosen to self-test some target configuration. We numerically derive a bound $Q_{\text{mirror}}$ for any mirror-symmetric configuration, thereby certifying asymmetry if this bound is exceeded (e.g. experimentally) for the unknown qubit configuration. We also consider the gap $(Q_{\text{max}}-Q_{\text{mirror}})$ between the analytically derived overall quantum maximum $Q_{\text{max}}$ and the mirror-symmetric bound, and use it as a quantifier of asymmetry in the target configuration. Numerical optimization shows that the most asymmetric configuration then forms a right scalene triangle on the unit Bloch sphere. Finally, we implement our protocol on a public quantum processor, where a clear violation of the mirror-symmetric bound certifies asymmetry in the configuration of our experimental triple of qubit states.

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