2006/03/17 by Daniel K. L. Oi, Johan Åberg, Johan Aberg · 15 citations
Computer Science · Physics and Astronomy · #Astronomical interferometer #Coherence (philosophical gambling strategy) #Computer science #Degree of coherence #Fidelity #Interference (communication) #Interferometric visibility #Interferometry #Optics #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum mechanics #Quantum nonlocality #Quantum optics and atomic interactions #Spectroscopy and Quantum Chemical Studies #Telecommunications #quant-ph
paper · pdf · doi:10.1103/physrevlett.97.220404
published in Physical Review Letters 97(22), 220404 (American Physical Society) · 4 pages, 4 Figures
arxiv created 2006/03/17 · openalex publication_date 2006/11/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
By utilizing single particle interferometry, the fidelity or coherence of a pair of quantum states is identified with their capacity for interference. We consider processes acting on the internal degree of freedom (e.g., spin or polarization) of the interfering particle, preparing it in states rhoA or rhoB in the respective path of the interferometer. The maximal visibility depends on the choice of interferometer, as well as the locality or nonlocality of the preparations, but otherwise depends only on the states rhoA and rhoB and not the individual preparation processes themselves. This allows us to define interferometric measures which probe locality and correlation properties of spatially or temporally separated processes, and can be used to differentiate between processes that cannot be distinguished by direct process tomography using only the internal state of the particle.