2017/09/30 by Yuto Ashida, Masahito Ueda · 92 citations
Physics and Astronomy · #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Hamiltonian (control theory) #Measure (data warehouse) #Non-equilibrium thermodynamics #Parity (physics) #Physics #Quantum #Quantum Mechanics and Non-Hermitian Physics #Quantum dynamics #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Statistical physics #cond-mat.quant-gas #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevlett.120.185301
published in Physical Review Letters 120(18), 185301 (American Physical Society) · 6+8 pages, 3+3 figures, to appear in PRL
arxiv created 2018/03/31 · openalex publication_date 2018/05/04 · arxiv updated 2018/05/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The ability to measure single quanta allows the complete characterization of small quantum systems known as full-counting statistics. Quantum gas microscopy enables one to observe many-body systems at the single-atom precision. We extend the idea of full-counting statistics to nonequilibrium open many-particle dynamics and apply it to discuss the quench dynamics. By way of illustration, we consider an exactly solvable model to demonstrate the emergence of unique phenomena such as nonlocal and chiral propagation of correlations, leading to a concomitant oscillatory entanglement growth. We find that correlations can propagate beyond the conventional maximal speed, known as the Lieb-Robinson bound, at the cost of probabilistic nature of quantum measurement. These features become most prominent at the real-to-complex spectrum transition point of an underlying parity-time-symmetric effective non-Hermitian Hamiltonian. A possible experimental situation with quantum gas microscopy is discussed.