2007/12/19 by Changsuk Noh, H. J. Carmichael
Computer Science · Physics and Astronomy · #Algorithm #Coherent states #Computer science #Factorization #Laser #Laser-Matter Interactions and Applications #Operator (biology) #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Quantum optics #Quantum state #Qubit #State (computer science) #quant-ph
paper · pdf · doi:10.1103/physrevlett.100.120405
published as Phys. Rev. Lett. 100, 120405(2008) · 4 pages, 1 figure
arxiv created 2007/12/19 · openalex publication_date 2008/03/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Disentanglement of a laser source from its target qubit is proposed as a criterion establishing the laser quantum state as a coherent state. It is shown that the source-target density operator has a unique factorization in coherent states when the environmental record monitoring laser pump quanta is ignored. The source-target state conditioned upon the complete environmental record is entangled, though, as a state of known total quanta number (source plus target).