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pro vyhledávání: '"Narnhofer, H"'
We consider a specific instance of a superconducting circuit, the so-called charge-qubit, consisting of a capacitor and a Josephson junction. Starting from the microscopic description of the latter in terms of two tunneling BCS models in the strong-c
Externí odkaz:
http://arxiv.org/abs/2304.13351
Publikováno v:
J. Phys. A: Math. Theor. 50 (2017) 423001
Recent experimental results point to the existence of coherent quantum phenomena in systems made of a large number of particles, despite the fact that for many-body systems the presence of decoherence is hardly negligible and emerging classicality is
Externí odkaz:
http://arxiv.org/abs/1708.02752
Akademický článek
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Autor:
Narnhofer, H., Wreszinski, W. F.
We prove a quantum version of the second law of thermodynamics: the (quantum) Boltzmann entropy increases if the initial (zero time) density matrix decoheres, a condition generally satisfied in Nature. It is illustrated by a model of wave-packet redu
Externí odkaz:
http://arxiv.org/abs/1309.2550
Publikováno v:
Physics Letters A, Vol. 372, Issue 13, 2190-2195 (2008)
We investigate the state space of bipartite qutrits. We construct an analog to the "magic" tetrahedron for bipartite qubits--a magic simplex W. It is formed by all convex combination of nine Bell states which are constructed using the Weyl operators.
Externí odkaz:
http://arxiv.org/abs/0705.1403
Publikováno v:
Eur.Phys. Lett. 72 (1), 28 (2005)
The entanglement-sharing properties of an infinite spin-chain are studied when the state of the chain is a pure, translation-invariant state with a matrix-product structure. We study the entanglement properties of such states by means of their finite
Externí odkaz:
http://arxiv.org/abs/quant-ph/0412167
Autor:
Narnhofer, H.
Equilibrium states of infinite extended lattice systems at high temperature are studied with respect to their entanglement. Two notions of separability are offered. They coincide for finite systems but differ for infinitely extended ones. It is shown
Externí odkaz:
http://arxiv.org/abs/quant-ph/0412152
We compare some recent computations of the entanglement of formation in quantum information theory and of the entropy of a subalgebra in quantum ergodic theory. Both notions require optimization over decompositions of quantum states. We show that bot
Externí odkaz:
http://arxiv.org/abs/quant-ph/0209081
Publikováno v:
Phys.Rev. A66 (2002) 032319
We work in the real Hilbert space H_s of hermitian Hilbert-Schmid operators and show that the entanglement witness which shows the maximal violation of a generalized Bell inequality (GBI) is a tangent functional to the convex set S subset H_s of sepa
Externí odkaz:
http://arxiv.org/abs/quant-ph/0111116
Publikováno v:
J. Phys. A: Math. Gen., v.34 (2001) 3083--3094
The anyon fields have trivial $\alpha$-commutator for $\alpha$ not integer. For integer $\alpha$ the commutators become temperature-dependent operator valued distributions. The $n$-point functions do not factorize as for quasifree states.
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Externí odkaz:
http://arxiv.org/abs/math-ph/0004006