Zobrazeno 1 - 10
of 297
pro vyhledávání: '"Canosa, N."'
We derive a general method for determining the necessary and sufficient conditions for exact factorization $|\Psi\rangle=\otimes_p |\psi_p\rangle$ of an eigenstate of a many-body Hamiltonian $H$, based on the quantum covariance matrix of the relevant
Externí odkaz:
http://arxiv.org/abs/2311.04426
Publikováno v:
Physical Review A 106, 062215 (2022)
We analyze the application of the history state formalism to quantum walks. The formalism allows one to describe the whole walk through a pure quantum history state, which can be derived from a timeless eigenvalue equation. It naturally leads to the
Externí odkaz:
http://arxiv.org/abs/2208.01187
Publikováno v:
Physical Review A 105, 032212 (2022)
We analyze exact ground state (GS) separability in general $N$ particle systems with two-site couplings. General necessary and sufficient conditions for full separability, in the form of one and two-site eigenvalue equations, are first derived. The f
Externí odkaz:
http://arxiv.org/abs/2112.04052
Publikováno v:
Journal of Physics B: At. Mol. Opt. Phys. 53 215402 (2020)
We investigate nonlinear effects on the dynamics of entanglement and other quantum observables in a system of two harmonic modes coupled through angular momentum. The nonlinearity arises from a quartic anharmonic term in each mode. The emergence and
Externí odkaz:
http://arxiv.org/abs/2004.11945
Publikováno v:
Phys. Rev. A 101, 052103 (2020)
We examine the existence of completely separable ground states (GS) in finite spin-$s$ arrays with anisotropic $XYZ$ couplings, immersed in a non-uniform magnetic field along one of the principal axes. The general conditions for their existence are d
Externí odkaz:
http://arxiv.org/abs/1911.06114
Publikováno v:
Phys. Rev. A 99, 062119 (2019)
We examine, in correlated mixed states of qudit-qubit systems, the set of all conditional qubit states that can be reached after local measurements at the qudit based on rank-1 projectors. While for a similar measurement at the qubit, the conditional
Externí odkaz:
http://arxiv.org/abs/1812.11251
Publikováno v:
Phys. Rev. B 99, 014409 (2019)
We analyze the phase diagram of the exact ground state (GS) of spin-$s$ chains with ferromagnetic $XXZ$ couplings under $n$-alternating field configurations, i.e, sparse alternating fields having nodes at $n-1$ contiguous sites. It is shown that such
Externí odkaz:
http://arxiv.org/abs/1809.00743
Publikováno v:
Lectures on general quantum correlations and their applications, F. Fanchini, D. Soares-Pinto, G. Adesso Eds. (Springer, 2017, pp 455-471)
We discuss a generalization of the conditional entropy and one-way information deficit in quantum systems, based on general entropic forms. The formalism allows to consider simple entropic forms for which a closed evaluation of the associated optimiz
Externí odkaz:
http://arxiv.org/abs/1712.09670
Publikováno v:
Phys. Rev. Lett. 119, 220605 (2017)
We analyze ground state (GS) factorization in general arrays of spins $s_i$ with $XXZ$ couplings immersed in nonuniform fields. It is shown that an exceptionally degenerate set of completely separable symmetry-breaking GS's can arise for a wide range
Externí odkaz:
http://arxiv.org/abs/1708.00565
Publikováno v:
Journal of Physics B 50 (2017) 095501
We investigate entanglement and coherence in an $XXZ$ spin-$s$ pair immersed in a non-uniform transverse magnetic field. The ground state and thermal entanglement phase diagrams are analyzed in detail in both the ferromagnetic and antiferromagnetic c
Externí odkaz:
http://arxiv.org/abs/1612.02539