Joint Seminar on Quantum Information and Technologies
2012/2013 | 2013/2014 | 2014/2015 | 2015/2016 | 2016/2017 | 2017/2018 | 2018/2019 | 2019/2020 | 2020/2021 | 2021/2022 | 2022/2023 | 2023/2024 | 2024/2025 | YouTube channel
until 2023/2024 Quantum Information Seminar | YouTube channel
2014-06-05 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30 
Piotr Migdał (ICFO, Barcelona)Which multiphoton states are related via linear optics?
We investigate which pure states of n photons in d modes can be transformed into each other via linear optics, without post-selection. In other words, we study the local unitary (LU) equivalence classes of symmetric many-qudit states. We provide a straightforward method for calculating invariants, which can be also measured experimentally.The results are related the feasibility of generating quantum states from others in the lab, when using only beam splitters and waveplates.
2014-05-29 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Marcin Markiewicz (Uniwersytet Gdański)Genuinely multi-point temporal quantum correlations and universal one-way quantum computing on 1D cluster states
We introduce a constructive procedure that maps all spatialcorrelations of a broad class of states into temporal correlationsbetween general quantum measurements. This allows us to presenttemporal phenomena analogous to genuinely multipartite nonlocalphenomena, such as Greenberger-Horne-Zeilinger correlations, which donot exist if only projective measurements on qubits are considered.The map is applied to certain lattice systems in order to replace onespatial dimension with a temporal one, without affecting measuredcorrelations. We use this map to show how repeated application of a1d-cluster-gate leads to universal one-way quantum computing whensupplemented with the general measurements.
2014-05-22 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Frederic Grosshans (Paryż)Increasing the Robustness of BB84 through Continuous Variable Cryptography Techniques
2014-05-15 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Konrad Banaszek (IFT UW)On the role of photon statistics in communication over an optical channel
2014-05-08 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Tomasz Kaftal (IFT UW)Enhanced Kitaev's phase estimation algorithm at the Heisenberg limit
2014-04-24 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Karol Bartkiewicz (UAM Poznań)Qubit amplifiers
2014-04-10 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Krzysztof Lorek (IFT UW)Extraction of tripartite entanglement from the vacuum
I will describe the process of extraction of entanglement from the vacuum, using a system of three space-like separated detectors, that get entangled even though they could not have been in causal contact. The amounts of tripartite and bipartite entanglement extracted will be compared in various settings.
2014-04-03 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Jan Chwedeńczuk (IFT UW)Cauchy-Schwarz inequality and particle entanglement
2014-03-27 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Michał Jachura (Wydział Fizyki UW)High-visibility nonclassical interference of photon pairs generated in a multimode nonlinear waveguide
2014-03-20 (Thursday)
Sali Duża Teoretyczna, Hoża 69 at 10:30
Zahra Shadman (IFT UW)