W E L C O M E
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Research Center for Quantum Information
Institute of Physics, Slovak Academy of Sciences
Dúbravská cesta 9, 84511 Bratislava, Slovakia
Tel: (+421 +2) 20910701
Fax: (+421 +2) 5477-6085
N E W S | old news |
11.02.2019 Job opening
We are opening a one-year postdoc position in the area of theoretical
quantum information theory. The postdoc is expected to work in close
collaboration with core members of RCQI on topics of their common interests
(quantum communication, quantum complexity theory, quantum simulations,
quantum foundations, etc.). Basic salary is 1400 eur / month, however,
additional funds, depending on the focus and performance, are expected.
The position is offered
for one year, but there is a possibility for one-year extension. The position
is funded by Institute of Physics of Slovak Academy of Sciences.
The application consists of CV (including list of publications), research statement (short summary of personal research interests and plans), and three names of potential referees we might ask for recommendation. Please send all this information to Mario Ziman by email (email@example.com) before February 28th. We are aiming to start as early as possible.
Selected candidates will be interviewed (online) and/or invited to
give a seminar at our research center. The research performance
and experience of the candidate will be the only selection criteria.
Čo nedokážu ani počítače budúcnosti? / What neither future computers can do?
Our colleague Daniel Nagaj is giving a SAVinci popular-science
talk [in Slovak] on quantum computers. It is part of a series of science-coffee events organized by Slovak Academy of Sciences. ... read more ...
Place: Westend Gate Lobby, Dúbravská cesta, Bratislava - Patrónka
Time: Wednesday 30/01/2019, 17:30
Grover search under localized dephasing
Decoherence in quantum searches, and in the Grover search, in particular, has already been extensively studied, leading very quickly to the loss of the quadratic speedup over the classical case, when searching for some target (marked) element within a set of size N. The noise models used were, however, almost always global. In this paper, we study Grover search under the influence of localized partially dephasing noise of rate p. We find that, in the case when the size k of the affected subspace is much smaller than N and the target is unaffected by the noise, namely when kp≪√N, the quadratic speedup is retained. Once these restrictions are not met, the quadratic speedup is lost. If the target is affected by the noise, the noise rate needs to scale as 1/√N to keep the speedup. We also observe an intermediate region, where if k∼Nμ and the target is unaffected, the speedup seems to obey Nμ, which for μ>0.5 is worse than the quantum, but better than the classical case. We also put obtained results for quantum searches into perspective of quantum walks and searches on graphs.
Daniel Reitzner and Mark Hillery
Phys. Rev. A 99, 012339 (2019)
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MAXAP (VEGA 2/0173/17),
We are happy to announce that 16th CEQIP workshop will be held
in June (3-6) and this year we will explore a completely
new venue - kings town Skalica (Vitriol). We expect the registration
and the submission will be open in February and closed in mid March.
Looking forward to see you there.
S E M I N A R S
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Shivang Srivastava (Bratislava)
Quantum secret sharing for a multipartite system under energy dissipation
Daniel Nagaj (Bratislava)
Leevi Leppäjärvi (Turku)
Measurement simulability in general probabilistic theories
V I S I T O R S
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02.05.2018-28.2.2019 Seyed Arash Ghoreishi
(Ferdowsi university of Mashhad, Mashhad, Iran)
10.03-03.04 Leevi Leppäjärvi
(Turku University, Finland)
23.04-28.04 Debmalya Das
(Harish-Chandra Research Institute, Allahābād, India)