Asymptotics and typicality of sequential generalized measurements

Date: środa, 28 września, 2022
Time: 15:15
Host: Quantum Information and Quantum Computing Working Group (CTP PAS)
Passcode: nisq
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, […]

Distinguishability-induced many-body decoherence

Date: środa, 28 września, 2022
Time: 12:00
Host: ICTQT
Passcode: 743020
Speaker: Christoph Dittel (University of Freiburg) Abstract Indistinguishability is the essential ingredient for many-body interference — a purely quantum mechanical interference effect between many identical bosonic or fermionic particles that can be exploited for a variety of applications, ranging from simulations with ultracold atoms to photonic quantum information processing. In this talk I give an […]

What is nonclassical about uncertainty relations?

Date: środa, 3 sierpnia, 2022
Time: 14:15
Passcode: 743020
Speaker: Lorenzo Catani (TU Berlin) Abstract Uncertainty relations express limits on the extent to which the outcomes of distinct measurements on a single state can be made jointly predictable. The existence of nontrivial uncertainty relations in quantum theory is generally considered to be a way in which it entails a departure from the classical worldview. […]

Quantum value for a family of I3322-like Bell functionals

Date: środa, 27 lipca, 2022
Time: 14:15
Passcode: 743020
Speaker: Nicolás Gigena (University of Warsaw) Abstract In this work, we study a three-parameter family of Bell functionals in a bipartite scenario with 3 measurement settings per party and 2 outcomes per measurement. The members of this family can be thought of as variations of the well-known I3322 functional, the only one in this scenario […]

Strongly coupled quantum Otto cycle with single qubit bath

Date: środa, 20 lipca, 2022
Time: 14:15
Speaker: Sagnik Chakraborty (Nicolaus Copernicus University, Torun) Abstract We discuss a model of a unitary evolution of two-qubits where the joint Hamiltonian is so chosen that one of the qubits acts as a bath and thermalizes the other qubit which is acting as the system. The corresponding master equation for the system, for a specific […]

Quantum Singular Value Transformation – A Unifying framework of quantum algorithms

Date: środa, 6 lipca, 2022
Time: 16:00
Host: Team-Net Quantum Computing Colloquium
Passcode: teamnet
Speaker: András Gilyén (Alfréd Rényi Institute of Mathematics) Abstract An n-qubit quantum circuit performs a unitary operation on an exponentially large, 2^n-dimensional, Hilbert space, which is a major source of quantum speed-ups. We show how Quantum Singular Value Transformation can directly harness the advantages of exponential dimensionality by applying polynomial transformations to the singular values […]

Nonlocal games and operator algebras: solution spaces and robust self-testing in the quantum commuting model

Date: środa, 29 czerwca, 2022
Time: 15:15
Host: Quantum Information and Quantum Computing Working Group (CTP PAS)
Passcode: nisq
Speaker: Alexander Frei (University of Copenhagen) Abstract We begin by recalling quantum strategies in the context of nonlocal games, and their description in terms of the state space on the full group algebra of certain free groups. With this description at hand, we then examine the quantum value and quantum strategies for the following prominent […]

Gaussian states, Kähler structures and an entanglement duality

Date: środa, 6 lipca, 2022
Time: 14:15
Host: room 45, ICTQT
Speaker: Robert H. Jonsson (Wallenberg Initiative on Networks and Quantum Information, Nordita (Stockholm) Abstract Gaussian quantum states play a central role in many branches of physics - from quantum optics, to condensed matter and quantum field theory. In this talk, I aim to showcase the strength of the Kähler structure formalism for Gaussian states by […]

Spectral Metric and Einstein Functionals

Date: piątek, 17 czerwca, 2022
Time: 12:15
Host: IFTIA Seminar (room 361)
Passcode: 78pA05
Speaker: Andrzej Sitarz Abstract I'll review the concept of expressing the two basic notions of Riemannian geometry using spectral methods and Wodzicki residue over the algebra of pseudodifferential operators. This approach admits generalizations to the framework of noncommutative geometry. Based on joint work with L.Dabrowski and P.Zalecki.