8th Central European Quantum Information Processing Workshop
2-5 June 2011, Znojmo, Czech Republic

PROGRAM (preliminary plan)

Thursday, 2.6.2011
12:00 Accommodation
14:30 Registration (Lecture hall) and Refreshment
15:30 Afternoon session (chaired by Jozef Gruska)
15:30 I Andreas Winter: Structure of LOCC   ΞΞΞ Even more mysterious than the set of separable quantum states, the class of local operations and clasical communication (LOCC) on a composite quantum system is an object almost not understood at all. In this talk i will start by giving rigorous mathematical definitions of LOCC and its finite-round subsets. Then i go on to prove certain structural properties of these sets of quantum operations. We will see that each round of communication may strictly increase the power of teh accessible transformations. Furthermore, in contrast to many other natural classes of state transformations, we can show that the class LOCC (with unbounded rounds) is not closed: i.e., there are tasks that cannot be performed by LOCC, although they can be solved to arbitrary precision, requiring more and more rounds of communication. In the process we encounter a number of interesting state discrimination and entanglement distillation tasks and protocols.
16:15 C David Reeb: Hilbert's Projective Metric in Quantum Information Theory
16:40 Break & Refreshment
17:00 I Paolo Perinotti: From information processing to Quantum Theory   ΞΞΞ Six principles about information processing are proposed, from which quantum theory can be proved. This result positively answers a question raised after the advent of quantum information theory, namely whether some of the amazing theorems on quantum information processing can be lifted to the rank of axioms, and then used to derive Quantum Theory. After an introduction to the operational probabilistic language, the principles are presented, along with their immediate consequences and interpretations. The proof that quantum theory can be derived form them will be sketched, with a review of some key theorems along with their consequences on information processing.
17:45 T Marcus Huber: Tutorial review on entanglement distillation
18:45 End of session
19:00 Welcome dinner

Friday, 3.6.2011
08:00 Breakfast
09:00 Morning session (chaired by Jan Bouda)
09:00 I Francesco Buscemi: Entanglement distillation and dilution in practical scenarios   ΞΞΞ In this talk I will present some recent results about entanglement distillation and dilution, in the case in which the initial (raw) resources are finite and/or correlated, and transformations can only be controlled with finite accuracy. I will moreover argue that, besides being closer to the cases of "practical" interest than some previous approaches, the information-theoretical analysis we conducted provides some further insights into the "abstract" theory of quantum entanglement as well.
09:45 C Abuzer Yakaryilmaz: NP has log-space verifiers with fixed-size public quantum registers
10:10 Break & Refreshment
10:30 I Cristian Calude : Quantum randomness:Where it is comming from and how random is it?   ΞΞΞ The talk will present recent theoretical and experimental results regarding the nature and quality of quantum randomness.
11:15 C Teiko Heinosaari: Quantum tomography with premises
11:40 C Michele Dall'Arno: Informational power of quantum measurements
12:05 End of session
12:15 Lunch
14:30 Foundations session (chaired by Beatrix Hiesmayr)
14:30 I Angelo Bassi: Is Quantum Theory Exact? Collapse models and the possibility of spontaneous quantum jumps   ΞΞΞ I will review the problems quantum mechanics encounters when describing measurement situations (more generally, the quantum-to-classicaltransition) and some solutions which have been proposed so far. I will focus on one such solution: models of spontaneous wave function collapse. I will describe their general features. I will discuss the lower and upper bounds on their parameters. I will review their status as phenomenological modifications of quantum mechanics, whose predictions can be tested experimentally, e.g. as in the entangled massive neutral kaon system copiously produced by the accelerator machines DAHNE or LHC. Based on [S.L. Adler and A. Bassi, Science 325, 275 (2009).]
15:15 Nicolai Friis: Lorentz invariance in quantum information ... a scrutiny
15:40 Refreshment
16:00 Poster session
18:30 Social dinner in Althanský palace (including true Moravian pig-slaughtering, bier and slivovice)

Saturday, 4.6.2011
08:00 Breakfast
09:00 Morning session (chaired by Francesco Buscemi)
09:00 I Stephanie Wehner: The uncertainty principle determines the non-locality of quantum mechanics   ΞΞΞ Two central concepts of quantum mechanics are Heisenberg's uncertainty principle, and a subtle form of non-locality that Einstein famously called ``spooky action at a distance''. These two fundamental features have thus far been distinct concepts. Here we show that they are inextricably and quantitatively linked. Quantum mechanics cannot be more non-local with measurements that respect the uncertainty principle. In fact, the link between uncertainty and non-locality holds for all physical theories.More specifically, the degree of non-locality of any theory is determined by two factors -- the strength of the uncertainty principle, and the strength of a property called ``steering'', which determines which states can be prepared at one location given a measurement at another. [Science 19 November 2010: Vol. 330 no. 6007 pp. 1072-1074]
09:45 C Ramon Munoz Tapia: Scavenging quantum information: Multiple observations of quantum systems
10.10 Break & Refreshment
10:30 I Daowen Qiu: Semi-quantum key distribution with less states and Semi-quantum secret sharing without entanglement    ΞΞΞ Boyer, Kenigsberg, and Mor [Phys.Rev.Lett.99, 140501(2007)] proposed a new semi-quantum key distribution with four states where a key can be securely distributed between Alice who can perform any quantum operation and Bob who works classically. We have proposed new protocols for semi-quantum key distribution with less than for states and their been analyzed in detail. Recently, this idea of "semi-quantumness" has been incorporated also to quantum secret sharing [Phys.Rev. A 82, 022303 (2010)], and a semi-quantum secret sharing protocol has been presented, where a quantum Alice, can share a secret key with two classical participants and they can collaborate to recover the secret, but none can do that alone. In the protocol, a three-particle maximally entangled state plays a crucial role. However, multipartite entangled states are generally difficult to prepare in experiments. Therefore, in the talk, we also present a new protocol for semi-quantum secret sharing where a quantum participant can share a secret key with two classical participants without using any entanglement. The protocol is also showed to be secure against eavesdropping.
11:15 C Michal Sedlák: Extremal generalized quantum instruments
11:40 C Sergey Filippov: Local two-qubit channels: probability-based comparison of constituents and entanglement-annihilating behavior
12:05 End of session
12:15 Lunch
14:30 Conference (probably bike) trip - visit of the Czechoslovakian fortress area in Šatov.
19:00 Conference dinner

Sunday, 5.6.2011
08:00 Breakfast
09:00 Morning session (chaired by Mario Ziman)
09:00 C Matty Hoban: Stronger Quantum Correlations with Loophole-free Post-selection
09:25 C Fabio Costa: Quantum correlations with no causal order
09:50 C Vedran Dunjko: Transformations between symmetric sets of quantum states
10:15 Break & Refreshment
10:45 C Hussain Anwar: Qutrit Magic State Distillation
11:10 C Tomáš Rybár:: Index of Quantum cellular automata and Memory channels
11:35 C Christoph Spengler: Composite parameterization and Haar measure for all unitary and special unitary groups
12:00 End of session
12:15 Lunch

List of posters

  1. Paul Erker: Detecting genuine multipartite entanglement in Dicke states
  2. Andreas Gabriel: Partial Separability in General Multipartite States
  3. Philipp Köhler: Entangled of Separable? A choice of factorization
  4. Karoline Muehlbacher: The Entropic Uncertainty Principle for Decaying Systems and CP violation
  5. Martina Mikova: Programmable phase gate with electronic feed-forward
  6. Tomasz Paterek: Correlation complementarity yields Bell monogamy relations
  7. Juha-Pekka Pellonpää: Extreme quantum observables
  8. Martin Plesch: Purification of genuine multipartite entanglement
  9. Daniel Reitzner: Unambiguous discrimination of Grover oracles
  10. Alexander Rivosh and Nikolajs Nahimovs: Quantum walks on two dimentional grid without amplitude amplification
  11. Stefan Schauer: Experimentally Feasible Security Check for n-qubit Quantum Secret Sharing
  12. Hans Schimpf: Experimentally implementable criteria revealing substructures of genuine multipartite entanglement
  13. Agnis Škuškovniks, Kaspars Balodis: N-player nonolocal games with worst-case distribution on inputs
  14. Jan Vlach: Allowable states of subsystems of system of modes of electromagnetic field in Gaussian state
  15. Magdalena Zych: Testing general relativistic effects with quantum interferometry

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