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

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 […]

Asymptotics and typicality of sequential generalized measurements

2022-09-26
Date: 2022-09-28
Time: 15:15
Location: Quantum Information and Quantum Computing Working Group (CTP PAS)
seminar
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

2022-09-26
Date: 2022-09-28
Time: 12:00
Location: ICTQT room 317
ICTQT Seminar
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 […]

Designing of quantum thermal machines

2022-09-23
Date: 2022-09-23
Time: 12:00
Location: room 317, ICTQT
ICTQT Seminar
Speaker: Srijon Ghosh Abstract The quest for small quantum thermal machines that can supersede their classical counterparts in performance has been an important and vibrant component in the field of quantum thermodynamics. These machines are expected to not only provide a better understanding of the interplay between the concepts from quantum information theory and thermodynamics, […]

What is nonclassical about uncertainty relations?

2022-08-02
Date: 2022-08-03
Time: 14:15
Location: room 45, ICTQT
ICTQT Seminar
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

2022-07-27
Date: 2022-07-27
Time: 14:15
ICTQT Seminar
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

2022-07-18
Date: 2022-07-20
Time: 14:15
ICTQT Seminar
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

2022-07-04
Date: 2022-07-06
Time: 16:00
Location: Team-Net Quantum Computing Colloquium
seminar
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 […]
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