2014/11/30 by Konrad H. Thomas, Konrad Thomas, Christian Flindt
Computer Science · Physics and Astronomy · #Amplitude damping channel #Conformal field theory #Conformal map #Entropy (arrow of time) #Joint quantum entropy #Observable #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum discord #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Quantum relative entropy #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.91.125406
published as Phys. Rev. B 91, 125406 (2015) · 13 pages, 10 figures, final version as published in Phys. Rev. B
openalex publication_date 2015/03/04 · arxiv created 2015/03/11 · arxiv updated 2015/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the entanglement and the R'enyi entropies of two electronic leads connected by a quantum point contact. For noninteracting electrons, the entropies can be related to the cumulants of the full counting statistics of transferred charge which in principle are measurable. We consider the entanglement entropy generated by operating the quantum point contact as a quantum switch which is opened and closed in a periodic manner. Using a numerically exact approach we analyze the conditions under which a logarithmic growth of the entanglement entropy predicted by conformal field theory should be observable in an electronic conductor. In addition, we consider clean single-particle excitations on top of the Fermi sea (levitons) generated by applying designed pulses to the leads. We identify a Hong-Ou-Mandel-like suppression of the entanglement entropy by interfering two levitons on a quantum point contact tuned to half transmission.