2016/10/31 by Florian Fröwis · 1 citation
Computer Science · Mathematics · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Computer science #Data mining #Mathematics #Measure (data warehouse) #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Quantum state #Schrödinger's cat #Spectroscopy and Quantum Chemical Studies #Statistical physics #Theoretical physics #quant-ph
paper · pdf · doi:10.1088/1751-8121/aa5a92
published as J. Phys. A: Math. Theor. 50 114003 (2017), Special issue: emerging talents · 7 pages (single column), 1 figure, 3 tables. v2: Reference added and minor changes
openalex created_date 2016/10/21 · openalex publication_date 2017/01/19 · arxiv created 2017/03/20 · arxiv updated 2017/03/21 · openalex updated_date 2026/08/06
Abstract Experimental progress with meso- and macroscopic quantum states (i.e. general Schrödinger-cat states) was recently accompanied by theoretical proposals on how to measure the merit of these efforts. So far, experiment and theory have been disconnected as theoretical analysis of actual experimental data was missing. Here, we consider a proposal for macroscopic quantum states that measures the extent of quantum coherence present in the system. For this, the quantum Fisher information is used. We calculate lower bounds from real experimental data. The results are expressed as an ‘effective size’, that is, relative to ‘classical’ reference states. We find remarkable numbers of up to 70 in photonic and atomic systems.