---

Unsharp quantum measurements provide a resource in scenarios where one faces the trade-off between information gain and disturbance. In this work we propose a scheme for semi-device-independent self-testing of unsharp measurements and show that all two-outcome qubit measurements can be self-tested in a robust way. Along with the main result we introduce a method to bound correlations in sequential measurement scenarios using semi-definite programming. This method can also be applied to refine security analysis of the semi-device-independent one-way quantum key distribution. We also present new information gain – disturbance relations for pairs of dichotomic measurements.

---

Nikolai Miklin, University of Gdansk
New Building 003
Contact: Mariami Gachechiladze