Zobrazeno 1 - 10
of 251
pro vyhledávání: '"Chiribella, G."'
Publikováno v:
Phys. Rev. Lett. 114, 120504 (2015)
Quantum states obey an asymptotic no-cloning theorem, stating that no deterministic machine can reliably replicate generic sequences of identically prepared pure states. In stark contrast, we show that generic sequences of unitary gates can be replic
Externí odkaz:
http://arxiv.org/abs/1412.1349
Autor:
Chiribella, G., Scandolo, C. M.
Publikováno v:
EPJ Web of Conferences 95, 03003 (2015)
We review a recent approach to the foundations of quantum mechanics inspired by quantum information theory. The approach is based on a general framework, which allows one to address a large class of physical theories which share basic information-the
Externí odkaz:
http://arxiv.org/abs/1411.2723
Publikováno v:
Phys. Rev. Lett. 113, 260402 (2014)
It has been recently shown that probabilistic protocols based on postselection boost the performances of phase estimation and the replication of quantum clocks. Here we demonstrate that the improvements in these two tasks have to match exactly in the
Externí odkaz:
http://arxiv.org/abs/1406.2218
Autor:
Chiribella, G., Yuan, X.
Gathering data through measurements is at the basis of every experimental science. Ideally, measurements should be repeatable and, when extracting only coarse-grained data, they should allow the experimenter to retrieve the finer details at a later t
Externí odkaz:
http://arxiv.org/abs/1404.3348
Autor:
Chiribella, G., Yang, Y.
Publikováno v:
New J. Phys. 16 063005 (2014)
We pose the question whether the asymptotic equivalence between quantum cloning and quantum state estimation, valid at the single-clone level, still holds when all clones are examined globally. We conjecture that the answer is affirmative and present
Externí odkaz:
http://arxiv.org/abs/1404.0990
Publikováno v:
Entropy, 14(10), 1877-1893 (2012)
After more than a century since its birth, Quantum Theory still eludes our understanding. If asked to describe it, we have to resort to abstract and ad hoc principles about complex Hilbert spaces. How is it possible that a fundamental physical theory
Externí odkaz:
http://arxiv.org/abs/1209.5533
Autor:
Chiribella, G.
Publikováno v:
New J. Phys. 14 125008 (2012)
We investigate the optimal estimation of a quantum process that can possibly consist of multiple time steps. The estimation is implemented by a quantum network that interacts with the process by sending an input and processing the output at each time
Externí odkaz:
http://arxiv.org/abs/1207.6172
Autor:
Chiribella, G.
Publikováno v:
Phys. Rev. A 86, 040301(R) (2012)
A no-signalling channel transforming quantum systems in Alice's and Bob's laboratories is compatible with two different causal structures: (A < B) Alice's output causally precedes Bob's input and (B< A) Bob's output causally precedes Alice's input. I
Externí odkaz:
http://arxiv.org/abs/1109.5154
Publikováno v:
Open Systems and Information Dynamics 20 (1), 1350003 (2013)
Quantum supermaps are higher-order maps transforming quantum operations into quantum operations. Here we extend the theory of quantum supermaps, originally formulated in the finite dimensional setting, to the case of higher-order maps transforming qu
Externí odkaz:
http://arxiv.org/abs/1012.3197
Autor:
Chiribella, G.
Publikováno v:
J. Phys. Conf. Ser. 284, 012001 (2011)
This paper presents a series of general results about the optimal estimation of physical transformations in a given symmetry group. In particular, it is shown how the different symmetries of the problem determine different properties of the optimal e
Externí odkaz:
http://arxiv.org/abs/1012.2130