Quantum Error Correction with Superconducting Transmon Qubits

Speaker: Barbara Terhal (QuTech, TU Delft & Forschungszentrum Juelich) Abstract We review the goals of quantum error correction, in particular the use of the surface code. We discuss some of the results and challenges in experimental quantum error correction, in particular with respect to qubit leakage.

Speaker: Rafał Demkowicz Dobrzański (University of Warsaw)

Speaker: Nicolás Gigena (University of Warsaw) Abstract We introduce a family of multipartite entanglement measures called "concentratable entanglements". These are connected to previously defined entanglement measures and have an operational interpretation in terms of probabilistic concentration of entanglement into Bell pairs. Furthermore, we show that these quantities can be estimated on a quantum computer by […]

Speaker: Jan Kolodynski (Center of New Technologies, University of Warsaw)  Abstract Device-independent quantum key distribution (DIQKD) constitutes the most pragmatic approach to quantum cryptography that does not put any trust in the inner workings of the devices. This is possible by constructing security proofs at the level of correlations being shared by the end-users, leveraging from […]

Speaker: Szymon Pustelny (Institute of Theoretical Physics, JU) Abstract The ability to generate, modify, and retrieve a quantum state is of paramount importance for quantum information. Conventional physical implementations of the schemes, enabling realization of the tasks, employ single microscopic objects (atoms, photons, superconducting circuits, etc.). However, operation with such objects presents many experimental challenges. […]

Speaker: Dardo Goyeneche (Universidad de Antofagasta, Chile) Abstract The quantum marginal problem consists in deciding whether a given set of marginal reductions is compatible with the existence of a global quantum state or not. In this talk, we formulate the problem from the perspective of dynamical systems theory and study its advantages with respect to […]

Speaker: Shubhayan Sarkar (CTP, PAS) Abstract A lot of work has recently been put into finding device-independent certification schemes for composite quantum systems. Most of them are however restricted to lower-dimensional systems, in particular two-qubit states. In this talk, I will first explain the basics of device-independent certification of quantum systems. Then, I will present […]

Speaker: Sander Gribling (Université de Paris) Abstract In this talk, I will first give an overview of recent techniques such as taking linear combinations of unitaries (LCU) and the quantum singular value transformation framework (QSVT). These techniques allow one to reduce many quantum algorithmic problems to questions about finding good / the best polynomial approximations […]

Speaker: Felix Huber (Institute of Theoretical Physics, UJ) Abstract

Speaker: Wen-Long Ma (Institute of Semiconductors, Chinese Academy of Sciences) Abstract The relation between projective measurements and generalized quantum measurements is a fundamental problem in quantum physics, and clarifying this issue is also important to quantum technologies. While it has been intuitively known that projective measurements can be constructed from sequential generalized or weak measurements, […]