Out of time ordered correlations, information scrambling and quantum entanglement
Speaker: Łukasz Grzelka (Jagiellonian University)
Time reversals of open quantum systems as linear involutions (or not)
Speaker: Eric Aurell (KTH Royal Institute of Technology) Abstract Standard quantum-mechanical time inversion is an anti-unitary operation representing time-reversal symmetry. A unitary quantum map hence is hence changed from $\Phi: \rho\to U\rho U^{\dagger}$ to $\Phi^{SQTI}: \rho\to U^{\dagger}\rho U$. One can ask what would be the corresponding operation acting on any CPTP map, which would still […]
Generalizing Choi map in $M_3$ beyond circulant scenario
Speaker: Giovanni Scala (ICTQT, UG) Abstract We introduce a family of positive linear maps in the algebra of $3\times3$ complex matrices, which generalizes the seminal positive non-decomposable map originally proposed by Choi. Necessary and sufficient conditions for decomposability are derived and demonstrated. The proposed maps offer a new method for the analysis of bound entangled […]
Improved local models and new Bell inequalities
Speaker: Sébastien Designolle (Zuse Institute, Berlin)
From superdecoherence to no-signaling
Speaker: Fereshte Shahbeigi (Jagiellonian University, Krakow)
Universal inversion of unitary and isometry operations: deterministic and exact algorithms
Speaker: Satoshi Yoshida (University of Tokyo) Abstract In this work, we report a deterministic and exact algorithm to reverse any unknown qubit-encoding isometry operation. We present the semidefinite programming (SDP) to search the Choi matrix representing a quantum circuit reversing any unitary operation. We derive a quantum circuit transforming four calls of any qubit-unitary operation […]
Lindblad Master Equation and the Quantum Brachistochrone
Speaker: Bartosz Grygielski (Faculty of Physics, UJ)
A random matrix model for random approximate t-designs
Speaker: Adam Sawicki (Centre for Theoretical Physics, Polish Academy of Sciences) Abstract For a Haar random set $\mathcal{S}\subset U(d)$ of quantum gates we consider the uniform measure $\nu_\mc{S}$ whose support is given by $\mathcal{S}$. The measure $\nu_\mc{S}$ can be regarded as a $\delta(\nu_\mc{S},t)$-approximate $t$-design, $t\in\mathbb{Z}_+$. We propose a random matrix model that aims to describe […]
Modes and states of light in Gaussian quantum metrology
Speaker: Giacomo Sorelli (Fraunhofer Institute for Optotronics, System Technology and Image Exploitation) Abstract Quantum optical metrology aims to identify ultimate sensitivity bounds for the estimation of parameters encoded into quantum states of the electromagnetic field. In many practical applications, including imaging, microscopy, and remote sensing, the parameter of interest is not only encoded in the […]
Quantum correlations from the post-quantum perspective: When can we have security against a super-quantum adversary ?
Speaker: Marcin Wiesniak (Gdansk University)