Zobrazeno 1 - 10
of 552
pro vyhledávání: '"Tworzydlo A"'
Most superconductors are thermal insulators. A disordered chiral \textit{p}-wave superconductor, however, can make a transition to a thermal metal phase. Because heat is then transported by Majorana fermions, this phase is referred to as a Majorana m
Externí odkaz:
http://arxiv.org/abs/2410.17076
Autor:
Zakharov, V. A., Polla, S., Vela, A. Donís, Emonts, P., Pacholski, M. J., Tworzydło, J., Beenakker, C. W. J.
Publikováno v:
Phys. Rev. Research 6, 043059 (2024)
To apply the powerful many-body techniques of tensor networks to massless Dirac fermions one wants to discretize the $p\cdot\sigma$ Hamiltonian and construct a matrix-product-operator (MPO) representation. We compare two alternative discretization sc
Externí odkaz:
http://arxiv.org/abs/2407.06713
We improve the test to show the impossibility of a quantum theory based on real numbers by a larger ratio of complex-to-real bound on a Bell-type parameter. In contrast to previous theoretical and experimental proposals the test requires three settin
Externí odkaz:
http://arxiv.org/abs/2405.03013
We present a precise certification test of the dimension of a qubit system on the public IBM quantum computer, using the determinant dimension witness and with a minimal number of independent parameters. We achieve it by mapping the Bloch sphere $\pi
Externí odkaz:
http://arxiv.org/abs/2404.06792
Magic-angle twisted bilayer graphene is a tunable material with remarkably flat energy bands near the Fermi level, leading to fascinating transport properties and correlated states at low temperatures. However, grown pristine samples of this material
Externí odkaz:
http://arxiv.org/abs/2403.19313
Publikováno v:
Phys.Rev.Lett. 133, 116501 (2024)
The Luttinger model is a paradigm for the breakdown due to interactions of the Fermi liquid description of one-dimensional massless Dirac fermions. Attempts to discretize the model on a one-dimensional lattice have failed to reproduce the established
Externí odkaz:
http://arxiv.org/abs/2401.10828
Publikováno v:
EPJ Quantum Technology 11, 62 (2024)
We investigate the dimensionality of bipartite quantum systems by construction of a device-independent null witness test. This test assesses whether a given bipartite state conforms with the expected quantum dimension, Schmidt number, and distinguish
Externí odkaz:
http://arxiv.org/abs/2312.13996
Publikováno v:
Annalen der Physik 535, 2300081 (2023)
I. Introduction II. Two-dimensional lattice fermions III. Methods to avoid fermion doubling (sine dispersion, sine plus cosine dispersion, staggered lattice dispersion, linear sawtooth dispersion, tangent dispersion) IV. Topologically protected Dirac
Externí odkaz:
http://arxiv.org/abs/2302.12793
Publikováno v:
EPJ Quantum Technol. 11, 21 (2024)
We demonstrate an implementation of the precise test of dimension on the qubit, using the public IBM quantum computer, using the determinant dimension witness. The accuracy is below $10^{-3}$ comparing to maximal possible value of the witness in high
Externí odkaz:
http://arxiv.org/abs/2301.03296
Publikováno v:
Annals of Physics 456, 169208 (2023)
The spectrum of massless Dirac fermions on the surface of a topological insulator in a perpendicular magnetic field $B$ contains a $B$-independent "zeroth Landau level", protected by chiral symmetry. If the Dirac equation is discretized on a lattice
Externí odkaz:
http://arxiv.org/abs/2210.01463