An elegant scheme of self-testing for multipartite Bell inequalities

An elegant scheme of self-testing for multipartite Bell inequalities

2022-11-08
Date: 2022-11-10
Time: 12:00
Location: ICTQT, room 317
ICTQT Seminar
Speaker: Ekta Panwar (UG/ICTQT) Abstract The predictions of quantum theory are incompatible with local-causal explanations. This phenomenon is called Bell non-locality and is witnessed by the violation of Bell-inequalities. The maximal violation of certain Bell-inequalities can only be attained in an essentially unique manner. This feature is referred to as self-testing and constitutes the most […]

Computable and operationally meaningful multipartite entanglement measures

2022-11-08
Date: 2022-11-14
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
seminar
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 […]

Device-independent quantum cryptography: disproving the sufficiency of Bell nonlocality and verifying the noise-robustness of current implementations

2022-11-03
Date: 2022-11-07
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
seminar
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 […]

Squeezing and ultrastrong coupling of light and matter

2022-11-02
Date: 2022-11-03
Time: 11:00
Location: ICTQT Seminar, room D 102, Chemistry Department, UG
ICTQT Seminar
Speaker: Adam Miranowicz, Adam Mickiewicz University (Poznań) and RIKEN (Wako) Abstract Experimental demonstrations and control of strong coupling of light and matter has lead to various applications for lasers, quantum sensing, and quantum information processing since 1980s. In my talk, I will review [1] recent theoretical and experimental progress in the ultrastrong coupling (USC) and deep-strong coupling (DSC) regimes of […]

Engineering and tomography of collective quantum state in gases

2022-10-26
Date: 2022-10-24
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
seminar
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. […]

Reconstructing the whole from its parts

2022-10-26
Date: 2022-10-31
Time: 14:15
Location: Quantum Chaos and Quantum Information (Jagiellonian University)
ICTQT Seminar
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 the […]

Reconstructing the whole from its parts

2022-10-26
Date: 2022-10-26
Time: 14:00
Location: ICTQT
seminar
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 […]

Certification of entangled quantum states and quantum measurements in Hilbert spaces of arbitrary dimension

2022-10-10
Date: 2022-10-12
Time: 12:30
Location: Center for Theoretical Physics Colloquium
seminar
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 […]

An optimal LCU-based quantum linear system solver

2022-10-10
Date: 2022-10-12
Time: 16:00
Location: Team-Net Quantum Computing Colloquium
seminar
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 […]
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