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pro vyhledávání: '"Aberg, Johan"'
Many search-based quantum algorithms that achieve a theoretical speedup are not practically relevant since they require extraordinarily long coherence times, or lack the parallelizability of their classical counterparts.This raises the question of ho
Externí odkaz:
http://arxiv.org/abs/2404.15235
Publikováno v:
Journal of Mathematical Physics 62, 093511 (2021)
We show that the norm squared amplitudes with respect to a local orthonormal basis (the classical restriction) of finite quantum systems on one-dimensional lattices can be exponentially well approximated by Gibbs states of local Hamiltonians (i.e., a
Externí odkaz:
http://arxiv.org/abs/2010.11643
Publikováno v:
Phys. Rev. Lett. 125, 110505 (2020)
Quantum networks play a major role in long-distance communication, quantum cryptography, clock synchronization, and distributed quantum computing. Generally, these protocols involve many independent sources sharing entanglement among distant parties
Externí odkaz:
http://arxiv.org/abs/2002.05801
Publikováno v:
IEEE Transactions on Information Theory 66, 339 (2019)
Testing whether a probability distribution is compatible with a given Bayesian network is a fundamental task in the field of causal inference, where Bayesian networks model causal relations. Here we consider the class of causal structures where all c
Externí odkaz:
http://arxiv.org/abs/1701.00652
Autor:
Aberg, Johan
Publikováno v:
Phys. Rev. X 8, 011019 (2018)
Systems that are driven out of thermal equilibrium typically dissipate random quantities of energy on microscopic scales. Crooks fluctuation theorem relates the distribution of these random work costs with the corresponding distribution for the rever
Externí odkaz:
http://arxiv.org/abs/1601.01302
Autor:
Aberg, Johan
Publikováno v:
Phys. Rev. Lett. 113, 150402 (2014)
Due to conservation of energy we cannot directly turn a quantum system with a definite energy into a superposition of different energies. However, if we have access to an additional resource in terms of a system with a high degree of coherence, as fo
Externí odkaz:
http://arxiv.org/abs/1304.1060
Autor:
Aberg, Johan
Publikováno v:
Nature Communications 4, 1925 (2013)
The work content of non-equilibrium systems in relation to a heat bath is often analyzed in terms of expectation values of an underlying random work variable. However, we show that when optimizing the expectation value of the extracted work, the resu
Externí odkaz:
http://arxiv.org/abs/1110.6121
Publikováno v:
Nature 474, 61--63 (2011)
Landauer's erasure principle exposes an intrinsic relation between thermodynamics and information theory: the erasure of information stored in a system, S, requires an amount of work proportional to the entropy of that system. This entropy, H(S|O), d
Externí odkaz:
http://arxiv.org/abs/1009.1630
Publikováno v:
Communications in Mathematical Physics, Vol. 306, No. 1, 165-186 (2011)
We consider an extension of the conditional min- and max-entropies to infinite-dimensional separable Hilbert spaces. We show that these satisfy characterizing properties known from the finite-dimensional case, and retain information-theoretic operati
Externí odkaz:
http://arxiv.org/abs/1004.1386
Publikováno v:
New J. Phys. 15 (2013) 033025
We raise the question whether there is a way to characterize the quantum information transport properties of a medium or material. For this analysis the special features of quantum information have to be taken into account. We find that quantum commu
Externí odkaz:
http://arxiv.org/abs/0910.1745