Symplectic tomographic probability distribution of crystallized
Schr\"odinger cat states
- URL: http://arxiv.org/abs/2203.07783v1
- Date: Tue, 15 Mar 2022 11:03:47 GMT
- Title: Symplectic tomographic probability distribution of crystallized
Schr\"odinger cat states
- Authors: Julio A. L\'opez-Sald\'ivar, Vladimir I. Man'ko, Margarita A. Man'ko
- Abstract summary: We study a superposition of generic Gaussian states associated to symmetries of a regular polygon of n sides.
We obtain the Wigner functions and tomographic probability distributions determining the density matrices of the states.
- Score: 1.2891210250935143
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Within the framework of the probability representation of quantum mechanics,
we study a superposition of generic Gaussian states associated to symmetries of
a regular polygon of n sides; in other words, the cyclic groups (containing the
rotational symmetries) and dihedral groups (containing the rotational and
inversion symmetries). We obtain the Wigner functions and tomographic
probability distributions (symplectic and optical tomograms) determining the
density matrices of the states explicitly as the sums of Gaussian terms. The
obtained Wigner functions demonstrate nonclassical behavior, i.e., contain
negative values, while the tomograms show a series of maxima and minima
different for each state, where the number of the critical points reflects the
order of the group defining the states. We discuss general properties of such a
generalization of normal probability distributions.
Related papers
- Gaussian Entanglement Measure: Applications to Multipartite Entanglement
of Graph States and Bosonic Field Theory [50.24983453990065]
An entanglement measure based on the Fubini-Study metric has been recently introduced by Cocchiarella and co-workers.
We present the Gaussian Entanglement Measure (GEM), a generalization of geometric entanglement measure for multimode Gaussian states.
By providing a computable multipartite entanglement measure for systems with a large number of degrees of freedom, we show that our definition can be used to obtain insights into a free bosonic field theory.
arXiv Detail & Related papers (2024-01-31T15:50:50Z) - Truncated generalized coherent states [0.0]
A class of generalized coherent states is determined for the distribution of excitations.
The statistics is uniquely sub-Poissonian for large values of the label.
As particular cases, truncated Wright generalized coherent states exhibit uniquely non-classical properties.
arXiv Detail & Related papers (2022-09-29T23:20:25Z) - Thermal equilibrium in Gaussian dynamical semigroups [77.34726150561087]
We characterize all Gaussian dynamical semigroups in continuous variables quantum systems of n-bosonic modes which have a thermal Gibbs state as a stationary solution.
We also show that Alicki's quantum detailed-balance condition, based on a Gelfand-Naimark-Segal inner product, allows the determination of the temperature dependence of the diffusion and dissipation matrices.
arXiv Detail & Related papers (2022-07-11T19:32:17Z) - Spectral clustering under degree heterogeneity: a case for the random
walk Laplacian [83.79286663107845]
This paper shows that graph spectral embedding using the random walk Laplacian produces vector representations which are completely corrected for node degree.
In the special case of a degree-corrected block model, the embedding concentrates about K distinct points, representing communities.
arXiv Detail & Related papers (2021-05-03T16:36:27Z) - Exact thermal properties of free-fermionic spin chains [68.8204255655161]
We focus on spin chain models that admit a description in terms of free fermions.
Errors stemming from the ubiquitous approximation are identified in the neighborhood of the critical point at low temperatures.
arXiv Detail & Related papers (2021-03-30T13:15:44Z) - Complete entropic inequalities for quantum Markov chains [17.21921346541951]
We prove that every GNS-symmetric quantum Markov semigroup on a finite dimensional algebra satisfies a modified log-Sobolev inequality.
We also establish the first general approximateization property of relative entropy.
arXiv Detail & Related papers (2021-02-08T11:47:37Z) - Generalization of group-theoretic coherent states for variational
calculations [1.2599533416395767]
We introduce new families of pure quantum states that are constructed on top of the well-known Gilmore-Perelomov group-theoretic coherent states.
We generate entanglement not found in the coherent states themselves, while retaining many of their desirable properties.
arXiv Detail & Related papers (2020-12-22T16:50:25Z) - Random Matrix Theory of the Isospectral twirling [0.0]
We compute the Isospectral twirling of several classes of important quantities in the analysis of quantum many-body systems.
We show how these quantities clearly separate chaotic quantum dynamics from non chaotic ones.
arXiv Detail & Related papers (2020-12-14T16:29:15Z) - Hilbert-space geometry of random-matrix eigenstates [55.41644538483948]
We discuss the Hilbert-space geometry of eigenstates of parameter-dependent random-matrix ensembles.
Our results give the exact joint distribution function of the Fubini-Study metric and the Berry curvature.
We compare our results to numerical simulations of random-matrix ensembles as well as electrons in a random magnetic field.
arXiv Detail & Related papers (2020-11-06T19:00:07Z) - Generic aspects of the resource theory of quantum coherence [0.0]
We prove that if two $n$-dimensional pure states are chosen independently according to the natural uniform distribution, then the probability that they are comparable as $nrightarrowinfty$.
We also study the maximal success probability of incoherent conversions and find an explicit formula for its large-$n$ distribution.
arXiv Detail & Related papers (2020-10-13T16:38:52Z) - General superposition states associated to the rotational and inversion
symmetries in the phase space [0.0]
It is shown that the resulting states form an $n$-dimensional set of states which can lead to the finite representation of specific systems.
The presence of nonclassical properties in these states as subpoissonian photon statistics is addressed.
arXiv Detail & Related papers (2020-04-06T13:10:34Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.