2018/05/18 by Hao Li, Andrei Piryatinski, Ajay Ram Srimath Kandada +2 · 16 citations
Computer Science · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Coupling constant #Entropy (arrow of time) #Entropy production #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum relative entropy #Scattering #Statistical physics #Von Neumann entropy #physics.optics #quant-ph
paper · pdf · doi:10.1063/1.5083613
published in The Journal of Chemical Physics 150(18), 184106 (American Institute of Physics)
arxiv created 2018/05/18 · openalex publication_date 2019/05/10 · arxiv updated 2019/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recent theories and experiments have explored the use of entangled photons as a spectroscopic probe of physical systems. We describe here a theoretical description for entropy production in the scattering of an entangled biphoton Fock state within an optical cavity. We develop this using perturbation theory by expanding the biphoton scattering matrix in terms of single-photon terms in which we introduce the photon-photon interaction via a complex coupling constant, ξ. We show that the von Neumann entropy provides a concise measure of this interaction. We then develop a microscopic model and show that in the limit of fast fluctuations, the entanglement entropy vanishes, whereas in the limit of slow fluctuations, the entanglement entropy depends on the magnitude of the fluctuations and reaches a maximum. Our result suggests that experiments measuring biphoton entanglement give microscopic information pertaining to exciton-exciton correlations.